bluuebunny/crossref_metadata_2025 huggingface dataset:
Ultrasonic Cleaning Device with Adjustable Power for Submerged Structure
Authors: Wu Qiang , Zhu Chang Ping , Yao Cheng , Wang Bin , Yin Yu Zhen , Chen Bing Yan , Ren Qing Gong , Han Qing Bang , Tang Yi Bin , He Zhen Bing , Chen Guo Chao , Li Zhen Xu , Chen Jin
Published: July 2014

In order to meet the demand of video detection and fast repair of cracks on large submerged structure in different depths, this paper designed an ultrasonic cleaning device with adjustable power. A hydraulic pressure sensor collects the pressure signal in the place to be detected in real time and then sends it to the MCU to deal with. This device will adjust the duty ratio of ultrasonic signal synchronously according to different signal of depth, while making the ultrasonic cleaning head work under the rated output power, so as to avoid the surface damage of building material and achieve the balanced cleaning effect. By testing in different water depths from 0 to 4 m, this device can well meet the submerged cleaning demands. It provides a good reference to design ultrasonic cleaning devices for greater depth range underwater.
Study on Self Judgment of Location Lave Speed of Acoustic Emission on Concrete Members
Authors: Li Qing , Shi Qi Yin , Jin Zhi Yu , Yang Fan , Liu Bao Bing
Published: July 2014

The wave speed of acoustic emission in the medium is uncertain, which is influenced by the source characteristics and the relative position between the acoustic emission source and the sensors. Due to this difference, the results of TDOA location method determination of wave speed in advance are very discrete. As to liner location ,the more farther the distance between two acoustic emission source sensor are, the more serious the discrete error are. Any of the two sensors, a location line can be obtained by setting the wave speed as a horizontal coordinate and the location as the vertical coordinate. The horizontal coordinate of location line of the different sensors is the real wave speed of acoustic emission events. This method has lower computational complexity, which can overcome the influence on acoustic emission location which wave speed setting error brings, having some practical value in Engineering.
Study on Structural Damage Detection Using RBF Network
Authors: Fan Jin Sheng , Yuan Ying , Cao Xiu Ling
Published: July 2014

Based on mode shape, a new parameter was put forward—mode shape curvature ratio, for detecting structure damages. And it was also the input vector of the RBF neural network. Then through finite element analysis and calculating, the training and forecasting samples were got for the network. The trained neural network can identify the damage location and degree of the frame structure. It proved that this method is simple and valid.
The Establishment of Ultrasonic-Rebound Curve in Steel Fiber Concrete
Authors: Luo Cai Song , Chen Hua Yan , Bi Xian Shun
Published: July 2014

For the application into country point highway of Xiamen to Kunming, a series of the C40 concrete with fly ash and slag have been studied by ultrasonic detection 、rebound detection and compression strength, analyzed the influence of ultrasonic velocity 、rebound value and compression strength with steel fiber content, fly ash and slag, the ultrasonic strength detecting wave of ultrasonic velocity、rebound value and compression strength is set up by regression analysis of the experimental data. The results show that the compression strength 、ultrasonic velocity and rebound value have good relativity, this ultrasonic-rebound detection method used in steel fiber concrete is simple and practical.
Pre-Test on the Behaviors of Vertical Prestressed Spacing to Composite Masonry Walls with Holes from the Aspect of Eccentrical Compression
Authors: Peng Jun , Zhang Dong Xiu , Yu Wen Bai
Published: July 2014

Based on the eccentric compression performance testing of the out-of-planes of 4 pieces of different pre-stressed composite masonry walls with holes and constructional columns, the pre-stress’s influences on the horizontal and vertical transmission and distribution, emergence and development of cracks, deformation of the components and fracture morphology and mechanism of the section stress along composite wall with holes are revealed. The testing shows that the pre-stress not only improves comprehensively the load-carrying properties of composite wall, but its fracture mechanism and mechanical model are the same as that of the non-pre-stressed composite wall, so that the same design approach can be used. And it provides further experimental basis to supplement and improve the basic theory and computation methods of eccentric compression of composite wall’s out-of-plane in the current masonry structure specifications. Only crack resistance and bearing capacity are studied in this article.
The Monitoring Method for Crack Damage of Concrete Structures Based on Piezoceramics Transducers
Authors: Zhang He
Published: July 2014

A method for monitoring the crack damage of concrete structure based on piezoceramics transducers was introduced in the paper. The PZT patches were packaged as smart aggregates which buried into concrete structures in pair. One is as actuator to transmit monitoring signals, and the other is as sensor to receive the monitoring signals. Sine sweep frequency wave was used as monitoring signal type, and its energy value was used as damage identification parameter. At last, a test was conducted to prove the effectiveness of monitoring method. The crack damage of a reinforced concrete beam under the load was monitored during the whole test process. The develop trend of damage identification parameter could reflect the develop trend of damage. The method proposed in the paper is feasible for crack damage monitoring of concrete structure.
A Study on Steel Fiber Influence to Rebar Corrosion in Concrete
Authors: Zhu Xiao E , Chen Xu Jun , Dai Mu Xiang
Published: July 2014

In dry-wet cycle chloride environment, the corrosion potential of the SFRC specimens is stable between-300mV to-400mV. And the common concrete specimens were about-500mV, adding steel fibers is higher corrosion potential and lower the corrosion possibility. Steel fiber has effective action on the controlling rebar corrosion and concrete crack. There were no cracks on all the surface of the SFRC specimens. Adding Steel fiber in concrete composed to be a corrosion cell as sacrificial anodes to protected steel rebar as cathode, in some degree to postpone rebar corrosion beginning time and increasing the structure services life.
Acoustic Emission in Protected and Non-Protected Concrete During the First 24 Hours
Authors: Topolář Libor , Pazdera Lubos
Published: July 2014

Concrete is a composite construction material frequently used in civil engineering. We know that concrete is as a man – when concrete is made it is as a baby, then it ages and its properties change in accordance to its baby life. That means it is better to monitor and change its properties when it is young as soon as possible. However, using the methods immediately after concrete birth (making the mixture) is difficult. Article describes monitoring concrete structure during the first 24 hours from their making. Acoustic Emission Method and the measurement temperature were used for monitoring both samples.
Construction Monitoring Method of Gui Dan Intercity Bridge in Guang Zhou
Authors: Zhu Xiang Hong , Jiang Zeng Bin
Published: July 2014

Gui Dan intercity cable-stayed bridge adopted the cantilever construction technique, and controlled construction work to ensure that the internal force and linear be similar to the design value. Linear control was mainly carried out by construction position elevation monitoring. Therefore, the construction control point elevation and the axis measure should be strengthened, and the results of each measure stage should be analyzed and compared with the results of monitoring model calculation to modify calculation model, and get a precise simulation model for the construction state. Calculating on account of the bridge state and adjusting the formwork elevation made the bridge linear approach to the design value, to ensure the project quality, safety and duration meet the contract requirement.
Integration, Application and Analysis of the SHM System for Continuous Rigid Frame Bridge
Authors: Wang Li , Yan Wei Ming , He Hao Xiang , Wang Wei
Published: July 2014

This paper is aiming to present the whole situation of a three spans prestressed continuous concrete rigid frame bridge’s SHM (structural health monitoring) system. Hardware structure and software exploitation of the system were respectively elaborated combining with the practical application situation, including details of sensors layout, data acquisition, storage and transform, the developing of monitoring and management system, etc. Emphasis is placed on data processing and analyzing which is collected from the bridge in the online continuously, such as modal identification of the measured acceleration responses, calculation of deflection curves in real time, observation of changing strains and stresses on the measuring points.
Application of Health Monitoring Technology in Steel Structure Engineering of Jinan Olympic Sports Center
Authors: Zhou Xue Jun , Yang Rong Qian , Ma Xiao , Xu Yuan
Published: July 2014

Complex structural pattern and behavior of Large-span steel structure result in famous research of health monitoring technology of this kind structure all over the world. Health monitoring to key parts of large-span steel structures during the construction and service process grasp the stress situation, which can ensure the safety of structures. In this paper, health monitoring project of Jinan Olympic Sports Center is introduced and the basis of test points’ layout is elaborated in detail. The result shows that the system designed is running stable, which means it has certain application value to other health monitoring to major engineering.
Estimation of Overall Reliability for Zero-Failure Batch Production Monitoring Instrument Based on E-Bayes Method
Authors: Fang Wei Hua , Zhang Na
Published: July 2014

To solve the problem of the overall reliability evaluation for the specific batch high-reliability monitoring instrument, for the practical problems for zero-failure data of the high-reliability instrument, we propose the batch production instrument overall reliability evaluation method based on E-Bayes theory, and give the point estimation and interval estimation of instrument overall reliability. Case study demonstrates the rationality and feasibility of the proposed method, which provides a reference for the dam safety monitoring management.
Health Monitoring Technology in Steel Structure Engineering of Jinan Grand Theatre Concert Hall
Authors: Zhou Xue Jun , Yang Rong Qian , Ma Xiao , Xu Yuan
Published: July 2014

Complex structural patterns and behaviors promote hot researches of health monitoring technology to large-span steel structures all over the world. Health monitoring to key parts of large-span steel structures during construction and service processes grasp the stress situation, which can ensure the safety of the structure. In this paper, self-developed health monitoring system which use vibrating wire sensor, had been developed to monitor Jinan Grand Theatre Concert Hall. The monitoring results show that there is no significant damage occurred in monitoring positions, which proves a reasonable design and a safe and stable state of the structure. Meanwhile, the self-developed health monitoring system has a high accuracy and good stability and can be widely applied.
Parameter Identification for Underground Powerhouse of Pumped-Storage Power Station Based on ARMA Time-Series Model
Authors: Han Fang , Zhong Dong Wang , Mo Ji Yun , Chen Hao
Published: July 2014

Identification of structural parameters by using observation data with noise in time domain was studied. Autoregressive-moving-average (ARMA) time-series model of a vibrating structure was established, and the identification problem of structural parameters was transformed into the identification problem of parameters of ARMA mode1. Based on the assumption of the unknown but bounded noise, an interval algorithm for set-membership identification of parameters of linear time-invariant system was used to seek the minimal hyper-rectangle of parameters, which is compatible with the measurements and the bounded noise, so that the structural parameters can be obtained. Then the Taian pumped-storage power station engineering project illustrates its feasibility and effectiveness.
Safety Control and Site Monitoring on High Formwork Support System of Fastener-Style Steel Pipe
Authors: Sun Wu , An Qin Li , Song Sheng Zhi , Huang Xin
Published: July 2014

The high formwork system monitoring program of the project example of high formwork support system of fastener-style steel pipe is carried out in detail, including monitoring content , measuring points arrangement, monitoring frequency etc. Based on the analysis of the monitoring data, influential factors of upright tube subsidence and the development trend of high formwork are presented. The site safety control suggestions are given for the high formwork system.
Study on Damage Identification of Simply Supported-Beam Based on Modal Strain Energy Method
Authors: Gu Yong Qiang , Mao Chun Feng
Published: July 2014

In present study, ANSYS finite element method was utilized to analyze the modal of simply supported beam and then the study on damage identification was performed based on modal strain energy method. The comparative analysis of results obtained by modal strain energy changes rate method and modal strain energy index demonstrates that modal strain energy index is an effective damage identification parameter.
Wind Tunnel Test of Tall Buildings with Irregularities of Elevation
Authors: Zhang Jian Guo , Zhuang Hui Min
Published: July 2014

In this paper, 2 high-rise building models with ladder and cascade irregularities of elevation were tested in a wind tunnel respectively to measure the mean and fluctuating wind pressure distributions. The mean and RMS (root-mean-square) coefficients of the drag, lift and torsion moment on the measuring layer were obtained from the wind pressures. In the direction which the buildings were positive in the wind, the variation of these above mentioned coefficients with height and the power spectrum densities of the fluctuating wind loads on sudden changed positions were analyzed in detail. Compared with the elevation regular tall building, the wind load characteristics of irregular ones were more complicated.
Research on the Application of Information Technology in the Dynamic Monitoring of Masonry Structure
Authors: Yu Cheng Xin , Yu Xianzhi , Xu Ning , Pan Bao Yu
Published: July 2014

It’s very important to ensure the safety of buildings by using information technology in the dynamic monitoring of masonry. The digital camera in this research is non-measurement camera which has no box marks and orientation equipment, so it’s hard to get instant photography and external orientation elements. But we use methods to establish a reasonable mathematical model, this makes the monitoring possible.
Vertical Deformation Prediction Method for Bridges Based on Grey System-BP Neural Network Model
Authors: Li Ming Jun , Wu Huan Huan , Feng Xiao
Published: July 2014

For there are many problems such as large amount interference factors, the amount of data collected is small, and so on occur in monitoring and forecasting, use the model that combine grey system and neural network to forecast. That is predicting with single model first, and then taking the prediction result of grey system as input sample value of BP neural network. Considering the measured values as objective sample value of network, neural network used to deformation forecast can be obtained through training. Prediction results show that this method can obtain a good forecasting result.
Damage of Basement and Foundation under Low-Temperature Environment and its Analysis
Authors: Liu Guang Yi , Wang Qi , Wang Hong Xing
Published: July 2014

Due to inappropriate protective measures during construction, building structures in cold regions can easily suffer from frost heaving damage during the wintering period. Such damage is relatively invisible and can hardly be detected. According to the actual engineering conditions, this paper comprehensively analyzes the destructional form of each building element at low temperatures as well as discusses the methods to detect and evaluate damage of buildings at low temperatures. The author finds that: Under low-temperature environment, punching failure often occurs between the foundation slab and bearing platform and the anchor connection between the pile and bearing platform can easily become ineffective.
Crack Control Technology for Concrete of Super-Large Section Precast Immersed Tube
Authors: Li Jin Hui , Liu Ke Xin , Tu Liu Qing , Jiao Yun Pang
Published: July 2014

As the complex structure, large size, hot climate, aggressive corrosive environment and high concrete strength grade for Super-large Section Precast Immersed Tube of Hong Kong-Zhuhai-Macao Bridge, crack control of concrete was difficult. On the basis of simulating analysis on thermal stress, temperature control design was carried out. Harmful crack could be effective controlled by series of treatment measures during construction period such as optimization of raw materials, preparation of low heat and shrinkage concrete, controlling concrete raw material temperature, mixing concrete with ice shavings and cooling water, setting up automatic maintenance system and automatic temperature monitoring system. From the monitoring results, the temperature monitoring results were consistent with the simulation data, and the maximum temperature and the temperature difference between concrete surface and internal concrete were met the requirement of temperature control standard. Moreover, the precast immersed tube didn’t appear harmful crack.
Reinforced Grouting Material Member Force Performance Research
Authors: Cui Xi Guang , Zhao Sheng Liang , Yang Wei , Tong Xu Yang , Geng Jie
Published: July 2014

This paper made the same size of reinforced grouting material vertical bending cantilever beam and reinforced concrete ones, respectively for the same static and dynamic load test, the static load for drab one-time loading level, dynamic load as low reversed cyclic loading, observe their cracking and deformation condition, draw the response relationship between the load and displacement hysteresis curves, skeleton curves, Test and data results show that the stress and deformation of the reinforced grouting material member is close to or even better a reinforced concrete member, so it is reliable to replace concrete with grouting material.
Experimental Study on Reinforcement of Failure Reinforced Concrete Beams
Authors: Chen Qiang , Liu Ling Yong , Meng Yang Jun
Published: July 2014

Through repair and reinforcement of breaking reinforced concrete beams by epoxy resin and carbon cloth, and its experiment, the crack and deformation and bearing capacity as well as ductility of such beams are obtained. Experimental results show that the ultimate bearing capacity of beams after reinforcement increased by 210%, the structure ductility fell by 170%, structural failure form is similar to failure in normal cross section.
Research on Mechanical Behavior of RC Beams Strengthened with CFRP by Anti-Arch Method
Authors: Luo Tao
Published: July 2014

The mechanical behavior of RC beam strengthened with CFRP by anti-arch method and directly pasting CFRP through model test is analyzed. It explains that the reinforced RC beam with CFRP by anti-arch method can solve the influence of beam's loading by the secondary stress which exists in the method of pasting CFRP directly in strengthening RC beams improve the beam's load when it cracks and the carrying capacity, and decrease the deflection deformation and crack width and gap when the beam carries load. It can make the most use of high strength of tensile properties of CFRP.
Investigation Study of Damaged Factors of Brick Structure Buildings in ZhengZhou
Authors: Su Wei , Wang Jing , Song Rong Fang
Published: July 2014

The damaged characteristic and damaged factors of brick structure buildings have been analyzed according to the survey datum of 138 damaged brick structure buildings in Zhengzhou, the laws of damaged characteristics and the effect degree of damaged factors have been discussed.
Application of Digital Speckle Correlation Method in Observation of Conrete Micro-Crack Damage
Authors: Wang Zhen Qiang , Liu Yan
Published: July 2014

The splitting test for concrete specimens in four different dimensions were carried out in order to build the relative even micro-crack damage fields. The real-time whole-field displacements of concrete surface were measured omni-directionally by DSCM(Digital Speckle Correlation Method). Through analyzing the obtained experimental data, two kinds of micro-crack damage parameter are established :one is damage area based on the MCOD (Micro-Crack Opening Displacement) and another is damage variable based on the weighting-damping elastic modulus, which provides a new index and method for characterization of concrete micro-crack damage.
Study on Influence of Freeze-Thaw for Chlorion Penetration
Authors: Wang Zhen Qiang , Zhang Ya Na , Liu Yan
Published: July 2014

Freeze-thaw cycles can affect the chloride diffusivity of concrete to a certain extend. The experimental study of plain concrete specimens with different strength grade were carried out, suffering 0, 50, 100 and 150 cycles of freeze-thaw. Chloride ion penetration under different strength, different cycle-index and the concrete mass-loss caused by freeze-thaw cycles are analyzed. Using this method the relationship of chlorion permeability with concrete strength is established when the concrete specimens reach to a particular value of freezing and thawing cycles.
Experimental Study on Fatigue Stiffness of RC Beams Strengthened with CFL under Variable Amplitude Overloading
Authors: Li Zheng Wei , Huang Pei Yan
Published: July 2014

This paper study the effects of stress amplitude on the fatigue performance of reinforced concrete (RC) beams strengthened with carbon fibre laminate (CFL). A total of 15 spcimens were tested under three point bending. Three load levels over 60% bending capacity of the strengthened beams with a stress ratio of 0.1 were applied to three groups of five specimens, respectively. The stress amplitudes of groups 2 and 3 are 10% and 15% larger than group 1, respectively. The loads and deflections during the tests were recorded. The fatigue stiffness of the strengthened RC beams with variable stress amplitude was discussed. The experimental results show that the rates of the bending stiffness deterioration of the retrofitted beams, which increase with the load level, under constant fatigue loading are smaller than those under variable fatigue loading.
Several Common Methods of the Old Bridge Reinforcement
Authors: Li Liang , Zhao Can Hui , Yang Xiao , Fan Bing Bing
Published: July 2014

In recent years, with the development of technology and theoretical study of bridge engineering, systematically retrofitting the old, sick and dangerous bridges has been an important content of bridge construction. There are many ways to reinforce bridges, and methods vary because of the form of bridge structure, location and terrain. This paper analyzed several common methods of bridge reinforcement, and made some instructions of the key points .
Simulation Analysis on Shear Behavior of RC Beams with Near-Surface Mounted GFRP Bars
Authors: Zhang Hai Xia , He Lu Yuan , Liu Hong
Published: July 2014

This paper focuses on the characterization of shear behavior of RC beams strengthened with Near-Surface Mounted (NSM) GFRP bars. Based on ABAQUS, the finite element model for the shear behavior is established and the simulated results are compared with the test results. The parameters including spacing and inclination of GFRP bars, mechanical properties of the groove-filling epoxy, stirrup ratio and shear-span ratio of the specimen beams for the shear behavior are discussed. The simulated results show that there has a good agreement with the experiment results. The beams strengthened with NSM GFRP bars have a significant improvement in shear capacity. Further more, the analysis results on the parameters indicate that ultimate shear capacity of the beam strengthened with NSM-GFRP bars gradually increases with the decrease of spacing of GFRP bars. The ultimate bearing capacity increases of the strengthened beam with inclination of 45° is the more larger than those of 60° and 90°. The different types of epoxy adhesive and shear-span ratio have a great influence on the load-deflection curves of the strengthened beams.
Strengthening Design of an Existing Old Masonry Building
Authors: Li Zhong Jun
Published: July 2014

In this paper, the structural performance of an existing old masonry building constructed in 1963 was detected in filed and assessed. The results indicated that essential strengthening measures should be adopted to improve its stiffness, strength and seismic performance. To keep the original architectural appearance and style of the building due to its particular historical significance, various strengthening technics (e.g. the externally bonded steel plate technic, the adding steel braces to enhance the lateral stiffness, the strengthening with steel mesh reinforced concrete splint method and etc.) were thus designed to repair and strengthen the structure. 10% probability of failure risk was used to determine the earthquake parameters involved in the seismic strengthening design, which has also reduced the engineering cost. The design methods presented in this study and the corresponding seismic construction measures adopted in the project are validated to be effective and feasible, and have achieved the given performance - oriented.
Study on Flexural Performance of RC Beams Strengthened with Bonded Prestressed CFL
Authors: Huang Jin Lin , Huang Pei Yan , Xie Jin Hui
Published: July 2014

Based on experimental research and calculation theory of flexural bearing capacity, a method for calculating the ultimate load bearing of normal section member strengthened with prestressed CFL is proposed. Static load experimental results of two beams show that when prestress level is 20%, the cracking load and yield load of RC beams strengthened with prestressed CFL are 37.5% and 39.3% respectively. It is larger than that of RC beam strengthened with nonprestressed CFL.
Study on Cracking Load of Normal Section for Concrete Beams Strengthened with BFRP Sheet
Authors: Chen Xu Jun , Zhu Xiao E , Yang Zhong
Published: July 2014

Based on the calculation method of cracking load for reinforced concrete beam, the formula to calculate cracking load of normal section for concrete beams strengthened with BFRP sheet is established. The cracking load experiment of seven concrete beams strengthened with BFRP and three concrete beams strengthened with CFRP is conducted, and the results showed that fiber sheet layers and fiber sheet types have little effect on cracking load of concrete beams strengthened, the cracking load of beams strengthened mainly depends on the strength of concrete. The comparison between estimated values and test values of concrete beams strengthened indicates that the estimated values are slightly smaller, the formula can be used to calculate the cracking load of concrete beams strengthened.
Study on Punching Resistance of Slab-Column Nodes Strengthened with CFRP Sheets by Nonlinear Finite Element Methods
Authors: Yang Xiao Hua , Yang Zhi Qing , Wu Fang Wu , Liu Xing
Published: July 2014

During punching shear failure process, the stress states near slab-column node are complex and nonlinear characters of reinforced concrete make the problems more complicated. In this paper, by considering nonlinear characters of reinforced concrete, punching carrying capacities of slab-column nodes are to analyze by using nonlinear finite element methods, and then the reasonable reinforcement schemes at slab-column nodes have been determined. The slab-column nodes are strengthened by using CFRP sheets. Compare punching bearing capacities of nodes in reinforcement structure with that in unreinforcement structure, the results show that this strengthened method can effectively improve punching resistance bearing capacities of slab-column nodes.
Seismic Isolation Retrofit of an Office Building Using Friction Pendulum System
Authors: Liu Lin , Li Xuan Min , Tian Wei
Published: July 2014

Friction Pendulum Systems have been used as base isolation systems for both new construction and retrofit around the world. This paper presented its implementation in an office building located in Shanghai. To evaluate its impact on seismic performance of the retrofitted structure, models are needed to capture the intricate nonlinear behavior of both structural components and isolator elements. Nonlinear time history analysis of the building for the original and retrofitted cases was conducted to assess the efficiency of the isolation system at the high earthquake level. The numerical results indicate that the retrofitted structure experiences significantly less damage and less deformation due to the shake isolation and energy dissipation through the isolators.
Seismic Performance Analysis of a High-Rise Structure with Multi-Short Columns
Authors: Fu Ri Rong , Li Lan Wen , Yuan Xin Yan , Liu Kang Ning , Li Ran
Published: July 2014

This paper aimed at a tall frame-shear wall structure contains multi-short columns, and did pushover analysis to this structure with finite element software, and evaluated its seismic performance under rare earthquake in seismic intensity of 6 degrees. It concluded that the structure can meet the "earthquake does not fall" seismic requirements, and will not appear the cut destruction of shear frame short columns, and can achieve "strong column weak beam" design requirements.
Application of Carbon Fiber Reinforcement Technology in Humidity Environment for Weave and Power Plant
Authors: Guo Xiao Yan
Published: July 2014

Carbon fiber material is a strengthened repair material that is new and efficient, and it has so many advantages such as excellent strength, efficiency, construction easily and extensive use. Corrosion-resistant and little section are the most important characteristics. Carbon fiber strengthened technology affix carbon fiber sheet to the surface of a member with epoxy binder of transferring character, thus causing the strengthened member and the improvement force of the member. The strengthened plan, design principle and construction courses are demonstrated by using carbon fiber composite reinforcement technology on little side and moisture condition. Carbon fiber is a kind of material which is extensive uses, endurance and corrosion-resistant according to project illustration, and it is exampled in similarity projects.
Experimental Tests on Strengthened Masonry Vaults
Authors: Hojdys Łukasz , Krajewski Piotr
Published: July 2014

This paper reports and discusses the results of experiments performed on masonry barrel vaults strengthened externally with a composite material. The vaults characterized by 125-mm thickness, 2000-mm internal span and 730-mm rise, were built of solid clay bricks and lime mortar. As a strengthening glass fiber grids or carbon fiber grids were used. They were embedded in a polymer-cement mortar at the vaults extrados. The main aim of presented research was to determine load-carrying capacity and examine failure modes of tested specimens. The results of performed tests show that observed failure modes depended on reinforcement ratio of strengthening layer. The specimen strengthened with one layer of glass fiber grid failed due to fibers rupture, whereas the vault strengthened with carbon fiber grid failed due to sliding along a mortar joint just above the abutment.
Nonlinear Finite Element Analysis on Shear Bearing Capacity of Masonry Wall Strengthened by SGFRP
Authors: Zhang Zhi , Gu Qian
Published: July 2014

4 finite element models of ANSYS were constructed according to the masonry wall specimens of the experimental study. A material nonlinear finite element analysis by the finite element calculation software ANSYS on masonry walls strengthened by SGFRP under the horizontal cyclic loads combined with constant gravity loads was performed. The load-displacement curves of the models obtained from ANSYS simulation were described. The ultimate loads of the 3 models strengthened by SGFRP increased significantly, and the fiber length affect the bearing capacity and the deformation capacity of the wall. The results of the nonlinear finite element analysis of the models agree well to the experimental results. Some effective and reasonable reinforcement suggestions are proposed.
Experimental Study and Recommendation on Concrete Cover Thinkness of GFRP
Authors: Gao Yan Yan , Liu Jian Xiong , Yue Chen Xi , Li Xiu Hua
Published: July 2014

Concrete cover thinkness of GFRP to ensure the safety, applicability and durability of the structure is of great significance. Based on studies to 30 the drawing specimens of concrete ,get bond strength of same GFRP diameter,same concrete strength, different concrete cover thinkness. Through the analysis of test data,it is concluded the relationship of the bond strength and the concrete cover thinkness.And basis on the relationship,it is determine the suggestive values on concrete cover thinkness of GFRP.Experimental data and suggestion can provide reference and theoretical basis for the GFRP engineering application and the establishment of the relevant specification.
The Application and Research of Performance-Based Fire Protection Design on Reconstruction Project
Authors: Wang Peng Fei
Published: July 2014

When large building being renovation, the new fire control design problem has being came out. A comprehensive transformation of architectural analysis and performance-based fire safety design is very important. In this paper, performance-based fire safety design in the transformation of engineering for the issue, analyze and explain the design of specific operating plans and evacuation design should be pay attention to.
Experimental Method of Corrosion Fatigue Behaviors for Steel Strand under Corrosive Environment and Cycle Loading
Authors: Yao Guo Wen , Zhong Li , Jiang Dong Xia
Published: July 2014

A loading device was developed in this paper basing on corrosion experiments of conventional metal and cable through collecting previous research about cable stress corrosion. This newly developed device makes loading possible under low frequency alternating stress and environmental corrosion coupling. Through the different condition for the steel strands corrosion experiments show that the speed of steel strand corrosion in alternating stress load is faster than non-stress and static-stress in the same conditions. The co-influence of corrosion and stress to the ductility of strand, the influence of alternating load peak and frequency to corrosion velocity were respectively analyzed. Three groups of verification experiment results show that the plastic deformation effects caused by the tension are much larger than the corrosion. Corrosion velocity of the specimens that reached threshold value under tensile stress is 1.47 times faster than the other three peak load specimens. And the ductility is not sensitive to low frequency, the ductility of the specimen is associated with tension and corrosion.
Comparison of Monte Carlo Simulation and Response Surface Method by Using ANSYS PDS
Authors: Song Chun Xue , Zhang Yi , Cao Ying Yi
Published: July 2014

Monte Carlo Simulation and Response Surface Method are two very powerful reliability analysis methods. Normally, in the reliability analysis of complex structures, the limit state function often can not be expressed in a closed-form. Usually, the codes for probabilistic analysis need to be combined with finite element models. ANSYS Probabilistic Design System (PDS) has provided a package to conduct probabilistic analysis automatically. This paper is going to compare the performance of these methods through an easy engineering problem in ANSYS. The results are going to be derived to show the feature of applying the corresponding reliability methods.
Effectiveness of Amino Alcohol-Based Corrosion Inhibitor and its Influence on Concrete Properties
Authors: Li Zun Yun , Tu Liu Qing , Qin Ming Qiang
Published: July 2014

Corrosion of steel is the most important cause of failure of reinforced concrete structures. Corrosion inhibitors are one of the prevention methods used to avoid steel corrosion in the presence of chlorides. In this study, the effectiveness of the amino alcohol-based corrosion inhibitor has been evaluated by long-term steel corrosion monitoring in reinforced concrete. Also its influence on selected concrete properties is studied including compressive strength and chloride diffusion test. The inhibitor was added to the concrete mixture. The results show that the corrosion inhibitor is effective in delay corrosion initiation compared to the control samples. The addition of inhibitors not only improves the compressive strength of the concrete but also reduces the penetration rate of chlorides into concrete.
Reliability Analysis of Offshore Structures with Consideration of Seasonal and Directional Effects
Authors: Song Chun Xue , Zhang Yi , Cao Ying Yi
Published: July 2014

In the recent past an increasing number of failure events have been observed for offshore structures due to exceptional environmental loading conditions such as large waves. The occurrence of these failure events indicates a possible improvement in the traditional modeling of environmental characteristics, which are the basis for the load models for structural analysis and design. In this paper, the seasonal and directional effects in the modeling of the significant wave height for structural reliability analysis are studied. The peak over threshold (POT) method is selected to model the extremes in the non-stationary point process for the wave heights. The time-varying parameters are taken into account with a cyclic changing pattern to reflect the seasonal behavior. Both the extreme values and the storm occurrence rate are investigated in the different seasons. The results are utilized for the load characterization of offshore structures to investigate their sensitivity to the changing seasonal effects in reliability analyses. An example of selected structure is discussed.
Stress Analysis of the Rectangular Retaining Wall under Water Pressure Based on Elasticity Mechanics
Authors: Wang Yong Wei , Guo Yan Qin
Published: July 2014

To study the distribution of stress in a dam with rectangular section under water, the dam was simplified a rectangular structure with limited length. Based on the theory of mechanics of elasticity a stress function was deduced which was used to calculate the stress and displacement in any point of the dam. The results show that the normal stress along the length direction was not equal to zero, but the strain along the direction equal to zero.
Research for Computing the Structure Reliability Index
Authors: Zhao Jia , Li Chang Hua
Published: July 2014

The paper discusses general theoretical and practical aspects of the emerging probabilistic and non-probabilistic approaches for uncertainty treatment in finite element analysis. Based on rough set theory, a new methodology for structural reliability computation is presented. The uncertain parameters of structures are expressed by rough variables. The structure reliability index is computed by rough function and metric. It is valid, and efficient in physics and geometry. Examples of practical application are given.
Simulation on Composition and Mechanical Properties of Concrete
Authors: Mu Hui Jin
Published: July 2014

The mechanical properties of concrete and aggregate components only, with the ratio, the intensity level, reinforcement situation, but also on the specimen geometry and other factors are closely related. This paper describes the use of mathematical methods to establish a theoretical model of the mechanical properties of concrete, and then be verified by testing or engineering practice, the results reflect the true mechanical properties of the actual structure of concrete, numerical results reveal the physical mechanism of concrete material damage, particularly the existence of internal material impact on the mechanical properties of concrete and size effect of meso defects.
Analysis about Isolation Effect for Mega Frame with Rubber Bearing
Authors: Cao Ya Di , Wang Xing Guo , Ge Nan
Published: July 2014

According to Lagrange equation in dynamics the motion equation of the mega frame with rubber bearing isolation was established. Its solution was approched with MTALAB language programming. The calculation results show that the seismic isolation system can significantly reduce the seismic dynamic response of inter-story drift. When the first layer support and the second support stiffness coefficient of rubber bearing being 190000 kN/m, and the equivalent damping coefficient being about 20000kN.s/m, the isolation efficiency can reach as high as 50%~88%, which is the best combination.
Influence of Splitting Load and Polypropylene Fiber on Permeability of Chloride Ion in Concrete
Authors: Liu Su Mei , Liu Xiang Jie , Xu Li Hua
Published: July 2014

Orthogonal experiment is used to study the influence of splitting load and mixing of polypropylene fiber of different volume fraction, different length and different mass ratio of long and short fiber on permeability of chloride ion in concrete. The results show that the chloride ion diffusion coefficient increases as the stress ratio increasing, and the relationship between them approximately agrees with exponential function. The influences of fiber volume fraction and fiber length on permeability of chloride ion in concrete are significant, and using shorter polypropylene fiber in the range of low volume fraction can lower permeability of chloride ion in concrete, whereas long fiber and large volume fraction will increase the permeability. The effect of lowering permeability of chloride ion in concrete is most obvious, when the fiber volume fraction is 0.1%, the fiber length is the combination of 6mm and 9mm, and the mass ratio of long and short fiber is 1:2.
Experimental Study and Analysis of the Structural Behavior of Steel-Concrete Composite Beam after Shear Connector Corrosion
Authors: Kuang Ya Chuan , Feng Jin Ren , Yu Zhi Wu , Liu Xiao Jie
Published: July 2014

Stud shear connector corrosion is an important factor for the durability degradation of steel-concrete composite structures. Stud shear connector corrosion in the natural environment is a slow process, so the shear capacity of deteriorated stud shear connector was studied by accelerate d deterioration using a galvanstatic method in this paper. Then, bending tests were conducted to study the structural behavior of steel-concrete composite beam after stud shear connector corrosion. Experimental results show that with the increase of conduction time, the corrosion rate of stud increases, the shear capacity of stud as well as the flexural capacity of steel-concrete composite beam decreases and the relative bond-slip between steel beam and concrete increases when loading. By the regression analysis of experimental results, formula was proposed to predict the shear capacity of studs after corrosion and the flexural capacity of deteriorated steel-concrete composite beam.
Non-Probabilistic Reliability and Slope Stability Analysis
Authors: Mu Huan Sheng
Published: July 2014

In the present paper, a non-probabilistic reliability method is proposed for slope stability analysis. Soil properties involved in non-probabilistic reliability analysis are viewed as random variables and represented by interval variables. The performance function for slope stability analysis is expressed as the difference between anti-sliding moment and driving moment. The non-probabilistic reliability index is defined as the ratio of the mean value of performance function to deviate. Three examples have illustrated the simplicity and applicability of the method. This method provides a new means for slope stability analysis.
Experimental Investigation on Steel H-Beam Prestressed with Externally High Strength Steel Bars
Authors: Zhu Peng Cheng , Gou Ming Kang , Zhou Yin Zhi
Published: July 2014

The external post-tensioning technique has been commonly used in the construction field because it facilitates the analysis of structures and is widely applicable for many types of structures. In this research, 12 steel H-beams were built and tested in terms of the amount of tendon or prestressing force. The results show that the externally prestressing method can increase ultimate bearing capacity of the beams. The prestressing force is the significant factor that influence the strengthening of steel H-beams. However, the amount of deviators cannot significantly influence the bearing capacity.
Seismic Fragility Analysis of Hill Buildings Sited on Slopes
Authors: Wang Li Ping , Ning Chao Lie , Huang Lin Qing
Published: July 2014

The hill buildings sited on slopes has been widely constructed in mountainous regions. In order to estimate the seismic vulnerability for this type of building under the effect of potential earthquakes, the exceedance probabilities of hill buildings and normal buildings in peak ground acceleration are calculated and compared by using the incremental dynamic analysis method. The fragility curves show the layout of hill buildings has considerable influence on the seismic performance. Specifically, due to the different layout for the hill buildings, the probabilistic characteristic at the collapse prevention level is significantly different from the characteristic of fragility curves at the initial performance level.
Study on Mechanical Properties of Corroded Reinforced Concrete Using Support Vector Machines
Authors: Yang Shuai , Fang Cong Qi , Yuan Zhi Jie
Published: July 2014

The mechanical properties of corroded reinforced concrete under repeated load are investigated. The maximum crack width, mid-span deflection and reduction factor are predicted by using support vector machines. The maximum crack width and deflection are predicted by the black-box modeling based on support vector machines with the radial basis function kernel function. The reduction factor is predicted by using piecewise regression formula, whole regression formula and black-box modeling, respectively. The proposed prediction method is verified by comparing all prediction results with the experimental values. It is shown that the proposed method has high prediction accuracy, extensive applicable range and many predictive strategies.
The Method Research for Appraisal of Reliability of Existing Lightweight Steel Structures
Authors: Liu Zhong Yang , Chen Wei , Zhang Li Jun
Published: July 2014

Combined with the characteristics of existing lightweight steel structures, the paper gives an adapted method and flowchart for appraisal of reliability of these structures, and explains objectives appraisal of existing lightweight steel structures. It indicates that assessment based on structural analysis is the available method for scientific and saving, according to the demond of market and owner. It also discussed the central technique and the main problems of appraisal in current, such as revision of partial load factors, consideration of conversion factors, etc.
Device for Time-Varying Mechanical Performance of Columns under Coupling Effects of Load and Environment
Authors: Li Qiang , Jiang Jian , Tong Jing
Published: July 2014

To study the durability of reinforced concrete structures under coupling effect of load and environmental, an analog device is developed. Device includes sustained loading, accelerated environmental corrosion and measuring systems. The load applied to the column is real-time monitored by the pressure sensor and compensated according to the stiffness degradation and stress relaxation of column due to the rebar corrosion. Electrode is placed in the column so that the arrangement of the measuring instrument is not restricted. Device successfully realizes monitoring the time-varying mechanical performance degradation of reinforced concrete under the coupling effect of load and environment.