bluuebunny/crossref_metadata_2025 huggingface dataset:
A Study on Data Communication Method for Building Detection Based on Wireless Sensor Network
Authors: Hao Feng Qi , Zheng Xiao Shi , Cheng Guang He , Han Ling Yan
Published: September 2014

A data communication method applicable to building detection industry based on the wireless sensor network (WSN) is designed and implemented in this paper, in which the cause of data loss is analyzed in accordance with the characteristics of wireless sensor network and that of building detection industry. Besides, relevant data storage protocol, staggered transmission protocol, and real-time data replenish protocol are formulated to solve the problem above and improve the reliability and integrity of data.
Analysis and Processing of Sampled Measurement Values Transmission Delay for Smart Substations Processing Layer
Authors: Wang Hui , Wu Cheng Hui , Zhou Yang
Published: September 2014

Safety and reliability are the key of the smart substation, which requires the transmission of sampled measurement values (SMV) is in real-time and accuracy. Therefore this paper analyzes all aspects of SMV delay. The model is set up and the method of phase compensation delay is put forward through analyzing, and an engineering example is given. The conclusion shows that the algorithm can reduce the phase error of SMV and improve the real-time performance of SMV transmission.
Comparisons on Reliability of Likert Scale between Crisp and Fuzzy Data
Authors: Lin Yuan Horng , Yih Jeng Ming
Published: September 2014

The purpose of this study is to compare the reliability of Likert scale between crisp and fuzzy data. The survey data is simulated based on two kinds of questionnaire data. They are questionnaire of crisp data and fuzzy data respectively. According to the viewpoints of fuzzy logic, human thinking is multi-value and fuzzy data will be more appropriate for survey. Therefore, it is proposed that the reliability from fuzzy data will be higher. Results of the simulation show that reliability of fuzzy data performs better than crisp data. Based on the findings of this study, some suggestions and recommendations are discussed for future research.
Somatosensory Application Study Based on Kinect Skeletal Tracking
Authors: Li Guang Song , Luo Jie Hong
Published: September 2014

Gesture recognition is a kind of interaction of the natural user interface (Natural User Interface), which plays an important role in the application of the body-experience. In this paper, it uses Kinect sensor to track the 20 skeleton joint points of human body, and calculates the distances and angles between the nodes to determine the specific body posture, and then responses to a specific function which is set up and gets somatosensory control effect. Experiments show that, this method has higher recognition rate, short response time, and has a good scalability. The algorithm can meet the common body sense experience requirement of the virtual environment, and improves the efficiency of using virtual.
Vibration Signal of Generator Features and its Fault Diagnosis Application
Authors: Wang Hui Yu
Published: September 2014

This paper study the wind turbine bearing vibration signal characterization and nonlinear transient characteristics, the transient signal characteristics were established based on Wigner-Ville spectrum entropy and support vector machine (SVM) extraction and fault diagnosis model and quantitative description of nonlinear characteristics of multi-scale method based on LMD sort of entropy, and the effectiveness of dynamic signal feature extraction and fault diagnosis method of the study, a typical experiment platform bearing bearing fault diagnosis experiment verified.
Transmission Method Based on Small Relay Core for Achieve Dynamic Measurement of the Flatness
Authors: Pan Yong Ming , Wang Xiao Lin , Qiu Rong Sheng
Published: September 2014

For the limitations of the relay iron core in the process of production and detection still use manual measurement in electrical industry, a dynamic measurement system is designed. Meanwhile, a set of transmission system is designed to achieve dynamic measurement. This transmission system can solve the limitations of factories using offline measurement, which is easy to implement, easy to operate, easy to popularize. What’s more, it is with high working efficiency and high economic efficiency.
Research on the Evaluation of Plane Orientation Error Based on Uncertainty Theory
Authors: Bao Jia Ding , Zhao Rui , Sun Yong Hou , Liu Fu Yun , Huang Mei Fa
Published: September 2014

Based on coordinate measuring machine (CMM) the given part is measured in any orientation, and then the least square evaluation mathematical model of plane orientation tolerance is established. What’s more, the uncertainty evaluation method of orientation error is proposed according to the uncertainty theory of new geometrical product specification (GPS). The face-to-face angularity is taken as the example to present the effectiveness of the proposed uncertainty evaluation method. The result shows that the uncertainty evaluation method not only meets the requirements of new GPS standard, but also ensures the integrity of the flatness inspection results. As a result, the accuracy of the workpiece inspection can be improved.
Optimal Experiment Design of Travel Time Tomography with Sparse Rays
Authors: Guo Ya Li , Han Yan , Liu Lin Mao
Published: September 2014

Aiming at the problems of travel time tomography with sparse rays, this paper improves the inversion stability by optimizing experiment design. This paper analyzes the influence factors of inversion stability and proposes the evaluating function on optimizing experiment design. The numerical simulations show that the optimization method is feasible and the optimum design make inversion more stable.
Instrumentation of On-Line Detection of Microbial Density
Authors: Zhou Peng Fei , Wang Zhen Hua , Zhang Xiao Mei , Wang Jin Hui , Liang Wei , Cai Jia Ling , Liu Ge , Cai Qiang
Published: September 2014

Microbial density is an important biochemical parameters of the training process. This article adopts the method of online measuring optical density of the reactor to obtain information on the growth of microorganisms, and flow photoelectric colorimetric instrument was developed based on this principles. Through MCU STM32F107VC output PWM to control peristaltic pump, to achieve the culture of continuous flow through the optical flow cuvette, using photocell to detect culture absorbed light intensity. The instrument can display detected parameters independently and adjust the control parameters, also can communicate with the PC by RS485. The instrument can achieve real-time monitoring of the growth of microorganisms in the reactor.
Feature Extraction of Valve Faults with Fixed Time Basis for Multi-Resolution
Authors: Liu Zhong Dong , Meng Ling Shuai , Sun Zhao Cheng
Published: September 2014

Gas valves are very important parts in compressors. If a valve fault in a compressor takes place, the expulsion of the compressor will decrease. In some critical cases, abnormal gas transmission will lead to a serious accident. This article proposes a method of fixed time basis in multi-resolution analysis and wavelet transform. This method can thoroughly resolve the problems occurred in present valve fault diagnosis caused by the fact that the wavelet transform does not have time shift invariance. By the analysis of experimental data, it shows that the valve fault can be preferably and accurately detected by using the method.
Array DOA Estimation by the Model of Four Elements in Quare Array Based on the Theory of Compressed Sensing
Authors: Yuan Rui , Yue Jun , Gao Hong Xiu
Published: September 2014

The DOA estimation by the model of four elements in the square array has studied based on the theory of compressed sensing. Using matching pursuit algorithm and orthogonality matching pursuit algorithm, the computer simulation was presented. The results show the method of DOA estimation by compressed sensing theory is simple, practical and low computational complexity.
Based on the Adaboost Algorithm of Face Detection Research
Authors: Yu Wei Bo , Zhao Lin , He Wei Ming
Published: September 2014

Because of the influence of complex image background, illumination changes, facial rotation and some other factors, makes face detection in complex background is much more difficult, lower accuracy and slower speed. Adaboost algorithm was used for face detection, and implemented the test process in OpenCV. Face detection experiments were performed on images with facial rotation and complex background, the detection accuracy rate was 85% and 99% respectively, the average detection time of each picture was 16.67ms and 76ms.Experimental results show that the face detection algorithm can accurately and quickly realize face detection in complex background, and can satisfy the requirements of real-time face recognition system.
Vortex Induced Vibration Analysis of Twin Box Girders by Means of Computational Fluid Dynamics
Authors: Zhan Qing Liang , Zhou Zhi Yong , Yang Ting , Ge Yao Jun
Published: September 2014

This paper analyzes the vortex induced vibration (VIV) phenomena of twin box bridge girders by means of 2D computational fluid dynamics (CFD) models. The modeling of turbulence follows a methodology known as large eddy simulation (LES) in which the large scales of turbulence are resolved, while the small ones are modeled by means of sub-grid-models. The dynamic response of structure in relation to the fluid is solved by embedding the code of Newmark-β method in user defined functions of Fluent. The time history of girder’s vibration displacement is obtained successfully, which agrees well with the experiment results of wind tunnel tests. “Lock-in”, “beat” phenomena and the displacement “detuning” phenomena in the locked field are also gained.
Research of Three-Truss Cable-Stayed Bridge Spatial Characteristic
Authors: Guo Jun Feng
Published: September 2014

Wuhan Tianxingzhou Yangtze River Rail-cum-Road Bridge is the first four line rail cable-stayed bridge in china, with three-truss cross section. The new structure presents complex load performance, especially the spatial mechanical characteristics, because the bridge supports six lanes and four railway load, inevitably the main truss will produce a great torque, leading to three-truss cross section distortion and warping deformation. Analysis of the whole bridge spatial structures is carried out. The space shear flexible beam grillage model is used for bridge structure simulation, the upper and lower vertical member and the horizontal link simulated with beam element, while the pylon with space beam element, the cable with cable element. Though the calculation of the cable force and stress, the main girders stress, the pylon stress, the displacement of the main girder and the pylon, it can be shown that the space force and displacement keep within the standard requirement.
The Research of Assessing and Strengthening One 40 Years Old Girder Arch Bridge
Authors: Yang Jian Yu , Jiang Peng Xiao
Published: September 2014

By investigating and examining one 40 years old girder arch bridge, this paper gets the current situation of the bridge. On account of these data, the reliability analysis and safety evaluation have been done, the reliability index was calculated, the dynamic reliability of the bridge was analyzed, and the disciplinarian of bearing capacity change with the deck pavement thickness and vehicle load level increasing was discuss. Moreover, the treatment project and strengthening measures was put forward.
Interval Threshold Setting Method of Vertical Support Reaction for Early Warning of Concrete Bridges
Authors: Ma Zhong Jun , Li Sen Sen
Published: September 2014

Existing bridge health monitoring systems neglect the benefit of support reaction index for the safeguard of bridge safety and generally do not include the monitoring of support reaction values. The basic setting method of vertical support reaction threshold was proposed in this paper. For concrete bridges, which have prominent discreteness, statistical analysis method should be employed to obtain the representative value of the modulus of elasticity. However, in practice, it is very difficult to obtain large amounts of data sample. The small sample analysis is necessary, with intent to reduce the uncertainty. For this purpose, t -distribution was introduced to carry out interval estimation for the mean value of modulus of elasticity. Confidence interval can be obtained and then be used as the representative value of modulus of elasticity. By adopting each endpoint of this interval respectively, two sets of vertical support reaction values under the most unfavorable load combination can be obtained and then multiplied by a reduction factor. For each bearing, there are two corresponding values, which can be used as boundary values and then interval threshold of vertical support reaction for concrete bridges early warning can be obtained. Finally, multiple level early warning based on the interval threshold can be actualized.
Experimental Study on Durability of Foundation Concrete of Transmission Lines in Golmud Area
Authors: Zhu Zhao Qing , Ding Shi Jun , Wang Bao Qi , Hou Xiao Yan
Published: September 2014

Transmission lines pass through various types of regions in China and some of that are corrosive. The foundation concrete of transmission lines in corrosive environments had shown serious deterioration, which usually caused by concrete deterioration, rebar corrosion, degradation of bond strength between rebar and concrete due to various corrosive effects. There are salt lake areas in west China where some power transmission channels pass through. Field tests are carried out in Golmud area to research the durability of foundation concrete of transmission lines. And test results show that the concrete strength in the air is higher than underground and the carbonation depth of the foundation concrete decreases with the increase of concrete compressive strength.
Analysis of Long-Term Deflection on Large-Span Continuous Rigid Bridge
Authors: Li Yuan , He Shuan Hai , Wang Chao , Luo Shuai
Published: September 2014

Through the long-term deflection observation results and the measured data of effective pre-stress of Humen bridge before and after reinforcement, using three-phase bridge long-term deflection calculation method, compare the measured data and the calculation conditions in three kinds. Basing on the measure value of construction degradation, presenting the long-term deflection correction coefficient of long-term deflection to predict construction deflection. Analysis results show that the calculation model considering the construction degradation is more close to the practical situation. The long-term deflection calculation method based on the coefficient of correction can be used in the prediction calculation.
Experimental Study on Suppression of Vortex-Induced Vibration of Central-Slotted Box Girder by Aerodynamic Countermeasures
Authors: Yang Ting , Zhou Zhi Yong
Published: September 2014

To study the mechanism on the vortex resonance characteristics of the central-slotted box girders, the large-scale sectional model vibration measurement and pressure measurement are employed. This paper takes a long-span cable-stayed bridge over the Yangtze River as an example to conduct the wind tunnel tests of large-scale sectional model. The test results indicate that it is the inside maintenance rails located in the aerodynamic susceptible sites that cause the vortex-induced vibration (VIV) of bridge model. Accordingly, the inside maintenance rails are proposed to be moved towards the central axis by a certain distance. The static pressure test results show that when shifting the inside maintenance rails, the negative mean pressure at the soffit plate knuckle line will not change dramatically, the fluctuating pressures on the upwind and downwind inclined panels can be reduced, and the fluctuating energy will be dispersed without a consistent predominant frequency. Wind tunnel tests of modified section are conducted and the results show that the VIV of bridge model can be suppressed completely due to the shift of inside rails.
Numerical Simulation upon Explosion and Collapse of Viaduct
Authors: Ji Shan , Zhang Guang Hui , Xie Wei Ping
Published: September 2014

A rigorous scheme must be formulated in advance before a viaduct is to be exploded, in this case, numerical simulation can provide effective guarantee to the formulation of the scheme. Focusing on the explosion engineering of a large-scale city viaduct, the process of its explosion and collapse were simulated by the LS-DYNA software. The vibration responses of soil surface caused by the explosion and collapse were analyzed, and also the numerical results were compared with the measurement data. The numerical results agreed well with the measurement data, which showed that the simulation method proposed in the paper could simulate the explosion process well and the results could be also an guidline for the similar projections in future.
A Study on Anti-Cracking Performance of Lime and Fly-Ash Stabilized Coal Gangue Roadbase Materials
Authors: Zhang Hu Zhu , Zhao Yan Hong
Published: September 2014

In order to determine the mix proportion with better anti-cracking performance of lime and fly-ash stabilized coal gangue roadbase materials, anti-cracking performance of lime and fly-ash stabilized coal gangue influenced by quality ratio of lime to fly-ash was studied based on the same aggregate gradation and the same aggregate ratio. And then crack of test road with different mix proportion was observed. Results show that both temperature shrinkage anti-cracking coefficient and drying shrinkage anti-cracking coefficient vary along parabola rule with the decrease of the quality ratio of lime to fly-ash. The mixture have the best anti-cracking performance when the quality ratio of lime to fly-ash is 5:15, which was test and verify in the transverse crack observations of test road. Lime and fly-ash stabilized coal gangue roadbase materials have a good anti-cracking performance and suitable for base in the pavement structure. The reasonable ratio of lime and fly-ash stabilized coal gangue roadbase materials in the engineering should be 5:15:80.
Asphalt Pavement Preventive Maintenance Technology Overview
Authors: Liu Zheng Bing
Published: September 2014

Since twentieth Century, the middle of 80's, our country highway enters the building climax. By the end of 2011, our country highway traffic mileage of 85000 kilometers, accounting for about 80% of the asphalt concrete pavement. Along with the age increasing and the mileage of highway's growth, has long suffered from the traffic load and environmental effects of the asphalt pavement will have varying degrees of damage, repair workload of asphalt pavement will be bigger and bigger, more and more complex. In this situation, has the important meaning of preventive maintenance of Expressway Asphalt pavement. This paper introduces the present situation of preventive maintenance of highway at home and abroad, and points out the significance of preventive maintenance on highway and economic development, discusses the measures and preventive maintenance of asphalt pavement.
Finite-Element Analysis of Prestressed Concrete Frame Joints with Spread-Ended Beams
Authors: Liu Qing Wen , Wu Fu Qiang
Published: September 2014

On the basis of the joint model experiment, the non-linear performance of joints is analysed by using finite element program. The concrete stress distribution, stirrups stress and dangerous area of joints with spread-ended beams are discussed. Finite element analysis shows that effective prestressing tendons through the joint core region play a beneficial role in concrete and can improve the compressive strengths of concrete, and help to improve the shear strength of joints. Finally, according to experiments and theoretical analysis, the beginning of the haunched region is the dangerous area of joint. In order to avoid concrete tension failure when exerting prestress, the beginning of the haunched region must have enough transverse U-shaped bars to resist the prestressing tension.
Fatigue Damage Property of Cement Concrete under Magnesium Sulfate Corrosion Condition
Authors: Zhao Hua , Xiong Rui , Guan Bo Wen
Published: September 2014

In view of the condition that there has been few investigation on the fatigue damage mechanism of cement concrete under sulfate corrosion, based on coupled function experiment of magnesium sulfate corrosion and fatigue loads, the flexural strength, the relative dynamic elasticity modulus and the water absorption of the dry saturation surface were detected and the microstructures of concrete hydrates at different corrosion age were analyzed. The results show that the corrosion fatigue factor of cement concrete decreases rapidly with the increase of time. The main reasons for corrosion fatigue damage of cement concrete are the microcracks caused by expansion products and the cracks produced by fatigue load. The mutually reinforcing effect between magnesium sulfate corrosion and fatigue load is revealed.
Natural Mineral Fiber Improved Asphalt Mixture Performance
Authors: Hao Meng Hui , Hao Pei Wen
Published: September 2014

Natural mineral fiber with good performances of mechanical properties and environmentally friendly, pollution-free especially have gradually aroused extensive concern. In order to improve the quality of asphalt pavement, explore the applicability of nature basalt fiber in enhanced asphalt mixture performance, this paper investigates two typical asphalt mixtures and contrastive studies pavement performance of asphalt mixture by high temperature stability, water stability, low temperature anti-cracking and fatigue performance between basalt fiber modified asphalt mixture and base asphalt mixture, and then study the basic principle of fiber reinforcing asphalt mixture. The research show that basalt fiber modified asphalt mixture has a better pavement performance than base asphalt mixture, its dynamic stability is 1.6 times than base asphalt mixture, low temperature anti-cracking performance increased by more 25% and fatigue life is more 2 times than base asphalt mixture. And the basalt fiber can be used in the road engineering as an additive material that enhances the comprehensive performance of asphalt pavement.
Study of Rheological Properties of Cariphalte Modified Asphalt
Authors: Hua Tan
Published: September 2014

To explore the effects of different factors on the rheological properties of cariphalte modified asphalt, based superpave asphalt binder relevant norms, through the use of dynamic shear rheometer Shell 70# asphalt under different temperature, frequency and strain conditions and rheological properties of cariphalte modified asphalt carrying on a systematic study, and comparative analysis of the two anti-fatigue properties of asphalt in the middle and low temperature.The results show that: compared with 70# asphalt, cariphalte modified asphalt has better rutting resistance over a wide temperature range; at lower frequencies and high intensity pavement, cariphalte modified asphalt to better resistance to permanent deformation; better fatigue resistance at low temperatures, and more fatigue damage is not easy to achieve.
Frame Beam-Column Joints in the Design of the Concrete Strength Grade
Authors: Wang Feng En
Published: September 2014

the framework structure beam-column node stress is complex, the traditional design, the strength grade of concrete frame column than beam slab concrete strength grade is high, the construction to bring huge inconvenience. After some experiments and experience, the design of beam-column joints of concrete strength grade should improve, convenient construction, improve the quality of engineering.
The Research of Disaster Mechanism and Control Measures of Karst Collapse Caused by Roadbed Construction
Authors: Hu Qing Guo , Wu Yong , He Zhong Ming
Published: September 2014

Combined with practical examples of karst roadbed construction of Zhanghua highway, the article analyzes catastrophic manifestations, disaster causes and common prevention measures of karst collapse caused by roadbed construction; according to research putting forward the corresponding treatment program on engineering examples, engineering practice to good effect, showing that the proposed scheme of karst treatment is reasonable and reliable, referencing for similar projects.
Wu Guang High-Speed Rail Track Irregularity Power Spectrum Analysis
Authors: Li Ji Yang , Liu Lin Ya , Kou Dong Hua
Published: September 2014

Irregularity is the locomotive and the main excitation source of vibration, is directly related to the smooth running of the train, safety and comfort, is to control the maximum operating speed of the train one of the main factors. The statistic specimen was collected by track geometry inspection car from Wuhan-Guangzhou high-speed rail. Based on the stationarity test of the specimen, Fast Fourier Transform (FFT) method was used to evaluate the spectrum of the whole specimen space. The power spectrum density (PSD) and related functions of track irregularity were obtained by MATLAB program. We analyzed it by comparing the fitting curve of the national speed lines and fitting curve of Qinhuangdao-Shenyang dedicated passenger railway line, by comparison, the Wuhan-Guangzhou high-speed railway track irregularity is much better than the national speed lines and Qinhuangdao-Shenyang dedicated passenger railway line. The parameter values of PSD fitting curve for track irregularity are obtained by the nonlinear curve-fitting algorithm in the least-squares sense, which has referencing value to maintenance high-speed rail.
Comparative Feature Analysis of Ground Surface Vibration Induced by High-Speed Train Running on Viaduct and Embankment
Authors: Mao Kun Ming , Wang Ting Ting , Ru Qian Wen , Li Yan
Published: September 2014

Based on the Abaqus parallel computing cluster system platform, the three-dimensional finite element model of train-track-viaduct/embankment-foundation-soil coupling is established. The three-dimensional space-time variation and Fourier spectrums characters of ground surface vibration vertical accelerations by high-speed train running on viaduct and embankment are simulated. The result shows that ground surface vibration is mainly excited by periodic axle force of the train in the site near the viaduct pier. In the site far from the viaduct pier, ground surface vibration is mainly from the transmission of the site near the viaduct pier. With the increased distance between the viaduct pier, the peak value of ground surface vibration vertical acceleration decreases, and decreases significantly when the distance is within 10m. There are two main frequency bands of Fourier spectrum of ground surface vibration vertical acceleration: low-frequency band 0-12Hz and high-frequency band 35-47Hz of viaduct route, and low-frequency band 0-21Hz and high-frequency band 25-45Hz of embankment route. In general, with the increased distance between viaduct/embankment, Fourier spectrum amplitude of every frequency band decrease, and attenuation speed of high-frequency band is much faster than-frequency band’s.
Human Induced Vibration of Flooring-Systems in a High-Rise Building
Authors: Jin Qiao , Sun Ze Yu , Jia Lian Guang , Wang Qiang , Hou Meng , Ma Yi , Xu Chi
Published: September 2014

The serviceability limit state of structures is subject to increasing attention. Flooring-systems may encounter vertical vibrations that may be perceived as annoying by stationary persons sitting or standing on the structure. This paper looks into human induced floor vibration of a 33-storey residential building by using theoretical analysis and in-situ inspection. The results show that though the vertical eigenfrequency of the floor satisfies the demand of vibration comfort stated in the Technical Specification for Concrete Structures of Tall Buildings (JGJ3-2010), the maximum value of vertical vibration of the floor system is excessively large, which is caused by the stiffness shortage of the floor due to the decreased floor thickness.
Morphodynamic Process of Dachan Bay in Pearl River Estuary Affected by Human Activities
Authors: Ji Rong Yao , Xu Qun , Mo Si Ping
Published: September 2014

The surrounding area of the Dachan Bay in the Pearl River Estuary has one of the highest economic development rates of China. Rapid industrialization and urbanization has resulted in extensive changes in land use, including the tidal flat reclamation and harbor construction. For the analysis of the morphological changes of the Dachan Bay, multi-temporal Landsat images have been digitized by using the integrated RS and GIS technique, and the digital elevation modes in different years were set up in combination with topographical and nautical data. From the change analysis, it can be concluded that the sea area of the Dachan Bay decreases to 6.0 km2, by 87.6% between 1907a and 2011a due to the large-scale tidal flat reclamation, and the maximum downcutting depth of the seabed in the entrance area is over 10m mainly caused by extensive harbor construction. Based on the research of the morphological change in recent decades, it is suggested that the human activities have become one of the major factors affecting the morphological processes of the Dachan Bay.
Influence of Load Condition on Flexural Properties and Shear Properties of Steel Tubular Columns Filled with Steel-Reinforced Concrete
Authors: Guan Ping , Chen Lan Xiang
Published: September 2014

In order to exert the force performance of steel tubular columns filled with steel-reinforced concrete, the focus of the paper is about the influence of load condition on flexural mechanical properties and the shear mechanical properties of the composite columns. The two types of loading conditions are: 1.Steel pipe, steel placed in the steel tube and concrete subject to compressive load simultaneously; 2.Compressive load acts on steel and concrete. The results show that the calculated results based on ADINA and the experimental ones are in agreement well. The calculated results also show that the load condition has no influence on flexural mechanical properties, but has a great influence on shear mechanical properties of the composite columns.
Stability Analysis of the Semi-Circular Guiding Dike
Authors: Xiao Zhong , Wang Yuan Zhan , Sun Ke Li , Sun Li Qiang
Published: September 2014

A quasi static finite element method for assessing cyclic bearing capacity of semi-circular guiding dike on natural or reinforced soft clay foundation is developed by combining the concept of cyclic shear strength with D-P yield criterion. Then the proposed method is numerically implemented in the framework of the large universal finite element software. Combining with a practical engineering, the stability of semi-circular guiding dike before and after foundation reinforcement is analyzed. The results showed that the foundation bearing capacity decreases obviously when cyclic weakening effect of soft foundation was considered, so cyclic weakening effect of soft foundation under cyclic wave load should be considered in practical design. Moreover, foundation reinforcement has an obvious effect to increase foundation bearing capacity.
Study on Hydraulic Characteristics and Optimization of Siphon Channel with Two Inlets in Drydock
Authors: Zhao Peng , Bai Yu Chuan
Published: September 2014

Compared with the siphon channel with one inlet, the siphon channel with two inlets has some problems such as low efficiency of flooding. Combining with the model test of siphon channel with two inlets in a drydock, three-dimensional numerical model was built to study the hydraulic characteristics of siphon channel system. The reliability of numerical model was confirmed by comparing the calculated value and measured value of hump pressure and flooding rate. Results of turbulent kinetic energy and dissipation rate indicate that flow kinetic energy is mainly dissipated by the friction and its impacting the wall behind partition and the effect of energy dissipation pillars are not obvious. By comparing flow state in front of energy dissipation section and flooding rate between design scheme and modified scheme, it is suggested that the guide wall should be dismantled to ameliorate flow state.
Example Analysis on Safety Monitoring of Breakwater Engineering
Authors: Zhang Er Lin , Zhang Rui Xia , An Yan Yong
Published: September 2014

Setting some projects including surface subsidence, pore water pressure and deep horizontal displacement etc, tracking monitoring soil deformation during construction, and controlling reasonable loading rate are the guarantee of safety and stability of foundation and structure during the construction of south breakwater of industrial park. Monitoring result shows that subsidence and displacement meet the design requirement, with more than 85% of foundation consolidation degree and every controllable parameter index, which achieves stability, safety and informatization construction of breakwater engineering, and guides similar engineering effectively.
Assessing Non-Market Value of Construction Waste Recycling
Authors: Tang Miao Han , He Xin , Gu Song
Published: September 2014

With the rapid development of China's construction industry, the production of construction waste has become a growth trend.Construction of waste treatment is urgently needed in the old main building demolition materials,crushed bricks and earth accounts for more than 90%.[1]Studies show that the root cause of a large number construction waste is that the awareness of the value of construction waste recycling still unclear.
Influence of Load Conditions on Mechanical Behaviors of Steel Tubular Columns Filled with Steel-Reinforced Concrete Subjected to Axial Load
Authors: Guan Ping , Chen Lan Xiang
Published: September 2014

By using the finite element software ADINA, the focus of the paper is about the influence of load conditions on the axial compression performance of steel tubular columns filled with steel-reinforced concrete (STSRC) with the base that the calculated results are confirmed by the experimental data. Three types of loading conditions are these that: 1. Steel pipe, steel placed in the steel tube and concrete bear the compressive load; 2. Compressive load acts on the steel and concrete and there is a good bonding between the steel and concrete; 3.The steel and concrete bear the axial load, but the bond-slip between the steel tube and concrete are considered. The results show that the calculated results based on ADINA and the experimental ones are in agreement well, the bearing capacity and the ductility of the short composite columns are not almost influenced by the load condition-one and load condition-two, while the load condition-three has a influence on the axial compression performance of STSRC.
Experimental Study on Serviceable Performance for Steel Reinforced Concrete Beam
Authors: Xu Jie , Zhou Xiao Na , Lian Feng , Zhou Guang Zhao
Published: September 2014

Steel Reinforce Concrete Beam (SRCB) has a better flexural strength and excellent performances of ductility and seismic resistance in contrast to reinforce concrete beam.Six SRCB have been done with different compressive strength of concrete,rebar ratio,rebar cover thickness and steel cover thickness. The paper analyses the character of deflection and crack development process in following aspects: the development of maximum width and average width of crack, the law between strain of rebar and steel with the width of crack and the crack closing character. Experimental study indicates that the deflection and crack development can be devided into three stages. SRCB with reasonable rebar and H-section steel arrangement manner has excellent serviceable performance,such as deflection, resistance to crack, crack width and crack closing performance.
KNN Classification Based MCS Method of Structural Reliability Analysis
Authors: Zhao Ying , Su Guo Shao , Yan Liu Bin
Published: September 2014

A KNN Classification Based MCS (Monte Carlo Simulation Method) is proposed for the reliability analysis which hindered by the implicit nature of the performance function. In the method, Markov chain is adopted to simulate a small amount of training samples, KNN classification is used to generate surrogate model of performance function, MCS is used to estimate the failure probability. An iterative algorithm is presented to improve surrogate precision dynamically in the region contributing to the failure probability significantly. The study results demonstrate that the proposed method has superior performance to the traditional response surface method.
Review of Fire Performance Experiment of Concrete-Filled Steel Tubular Columns
Authors: Xiang Kai , Wang Guo Hui , Pan Yan Chong
Published: September 2014

This paper presents a review of research progress in fire performance of concrete-filled steel tubular (CFST) columns. Experimental results of CFST columns in fire are reviewed with influence parameters, such as heights, cross-sectional dimension, section types, concrete types, concrete strengths, load ratio, load eccentricity, fire exposed sides and so on. Some conclusions of CFST columns under fire conditions are summarized. Deficiencies in the fire performance experiments of CFST columns are identified, which provide the focus for future research in the field.
The Experimental Research on the Anti-Corrosion Performance of Concrete with Different Mineral Admixtures under Sulfate and Chloride Environment
Authors: Qian Wen Xun , Zhang Yan Chi , Chen Xun Jie , Ouyang You Lin
Published: September 2014

The performance of resistance to sulfate attack and permeability of chloride ion on concrete with different mineral admixtures (fly ash, slag single or both adding) under sulfate and chloride environment were discussed. The results indicated the performance of resistance to salt attack on concrete with appropriate mineral admixtures was improved. Under chloride environment, the resistance to sulfate attack coefficient of testing mortars descended, and compressive strength loss rate of concrete was raised after dry-wet cycles. Therefore, the performance of resistance to salt attack on concrete was decreased in this environment. Besides, on the initial stage of corrosion, the ability to resist chloride ion penetration of concrete was improved under sulfate environment, while the penetrating of chloride ion was accelerated on the later stage.
The Indication of Damage in Concrete by Amplitude-Frequency of Acoustic Emission Signal
Authors: Jin Zhi Yu , Shi Qi Yin , Li Qing , Yang Fan
Published: September 2014

When the concrete is in the process of load, the curve of amplitude - frequency shows significant characteristic of exponential. As the load increases, the acoustic emission signals gradually become complete, the more obvious features of this exponential function. Using the least squares method, we can get an empirical function expression by fitting the data.Function expression has different regression coefficients in different load stages, and regression coefficients changing with load also presents certain rules, which has a good indication to qualitative process of structural damage.
Mechanical Properties Analysis and Optimal Design of the Main Girder of Movable Scaffold System
Authors: Wang Jian Bo , Xu Xun Qian , Zhu Yong
Published: September 2014

In order to promote the ability of independent research of Movable Scaffold System (MSS for short), this article studied the mechanical characteristic and the structure optimization about the main girder of MSS from a company. The FEM model for the main girder was established by ANSYS to study its static mechanical properties. Considering the cross section is discrete in the real projects, the genetic algorithm (GA) is used based on MATLAB by calling ANSYS, which effectively reduce the structural weight by 8.5% and 9.6%, separately. The results of modal analysis indicate that the natural frequency of the main girder ranges from 4Hz~12Hz, which satisfy the need of crane design. The conclusion of this article and the optimization method of exploration research have certain reference significance for similar products.
The Synthesis of Polycarboxylates Water Reducer with Phosphate Structure
Authors: Li Shun Kai , Wang Wen Rong , Gao Yu Jun , Fang Da Jing
Published: September 2014

This article uses hydroxylethyl acrylate and phosphorylation reagent for esterification reaction, synthesis of a phosphate ester monomer with double bonds, and phosphate ester monomer ,Participation as the third monomer polymerization of acrylic acid and isoprene polyoxyethylene ether (TPEG). Polycarboxylate was synthesized with phosphoric acid ester structure,Investigate the impact of Phosphate ester content in single and double to polycarboxylate performance. The results showed that the polycarboxylate with phosphate structure has excellent adaptability and reduction of water slump performance.
The Research on the Fineness Modulus and Fractal Dimension of Waste Glass Powder with Different Grinding Time
Authors: Ke Guo Jun , Wang Yan Chao
Published: September 2014

In this article through grinding colorless waste glasses respectively 1,2,3,4,5,6,7,8,10,20,30 min, then calculate the fineness modulus and fractal dimension of waste glass powder, it is concluded that with the extension of grinding time the fineness modulus of the waste glass powder show the trend of decreasing first then increasing and decreasing again in last,and it is mainly decided by the cumulative sieve residual value of different particle size.The fractal dimension of waste glass powder show the trend of increasing first then decreasing and increasing again in last, and it is mainly decided by the particle size,surface morphology and structure loose degree of the waste glass powder.
The Micro-Analysis of Thermal Insulation Glazed Hollow Bead Concrete after High Temperature
Authors: Zhang Ze Ping , Yu Jia , Li Fei Fei
Published: September 2014

Thermal insulation glazed hollow bead concrete is a new building material, which is bearing general physical and mechanical properties of concrete. Experimental study of concrete after high-temperature, it is different from the ordinary concrete, because there is component of glazed hollow bead. In this paper, based on the observations and analysis of thermal insulation glazed hollow bead concrete after high temperature under electron microscope and comparison with ordinary concrete, the failure mechanism of thermal insulation glazed hollow bead concrete after high temperature are obtained.
Experimental Study on the Stress-Temperature Curve of the Super High Early Strength Grouting Material at Elevated Temperature
Authors: Sun Chang Zheng , Zhang Qi , Zhao Tong Feng , Zhao Hai Nan
Published: September 2014

Based on 75 cube specimens(100mm×100mm×100mm) of the super high early strength grouting material at elevated temperature,this paper describes the design of the high temperature test,compressive test and some relevant phenomena in testing,analyzes strength of the super high early strength grouting material at elevated temperature,and obtains the stress-temperature curves of the super high early strength grouting material at elevated temperature.By analyzing the staged characteristics of the curves,the regularity of the strength of the super high early strength grouting material at elevated temperature is discussed and some fitting mathematical formulas are suggested.
An Experimental Study on Flexural-Tensile Property of Cement Stabilized Coal Gangue Roadbase Materials
Authors: Zhang Hu Zhu , Fang Yuan
Published: September 2014

In order to evaluate the flexural-tensile property of cement stabilized coal gangue roadbase materials, flexural-tensile strength and flexural-tensile modulus of materials, whose cement dosage range from 4% to 7%, were tested on the automatic servo universal material testing machine with one-third loading method. Based on the test data, correlation equations between cement dosage and flexural-tensile strength and flexural-tensile modulus were established. Results show that: cement dosage is an important influence factor of flexural-tensile property, both flexural-tensile strength and flexural-tensile modulus increase linearly with the increase of the cement dosage. Cement stabilized coal gangue roadbase materials have a good flexural-tensile property and suitable for base in the pavement structure.
Research on the Monitoring Technology of Cantilever Construction of Continuous Girders in Super Large Bridges
Authors: Gui Fang Ru
Published: September 2014

For the construction of large bridges, it is a very critical and difficult issue to obtain the pre-designed internal force state and geometric alignment through the control on the construction process when they are completed. This paper, according to the real-time monitoring results of the bridge structure in the construction process, assesses the deformation of the main components in primary construction phases as well as whether the variations of stress conform to the design requirements, security of construction process, and working state of structures.
Study on Construction Methods of Modern Architecture in Jiangsu Zhenjiang
Authors: Liu Jia
Published: September 2014

Construction methods of modern buildings are different from traditional buildings and they are the fundamental driving force of modernization of architecture. The article expands the research from three aspects, building materials, construction technology and human factors. The conclusion is the construction methods of modern architecture in Zhenjiang have the characteristics of scientific progress, localization and imbalance.
Study on Application Technology of the Integral Lifting Scaffold
Authors: Cui Wen
Published: September 2014

An integral lifting scaffold is a external scaffolding which used in high-rise building structure and outside decoration. The integral lifting scaffold gets lifting and descending function based on the cantilever scaffold and the suspended scaffold, which have the falling prevention device and the upsetting prevention device. The hook hanging on the bearing supporting frame of the elevator was connected with the scaffold bearing supporting frame, the electric hoist achieved overall lifting or descending, the signal generator and automatic console controlled synchronous lifting. It was indicated by field application that the integral lifting scaffold can integrally lift and descend, and it can shard to lift and descend in order to meet the construction requirements of stage structure and decoration.
Prediction on Modal Properties of Building Plates
Authors: Huang Xian Feng , Zhuang Zhi Xiang , Wei Shang You , Lan Jun Xin
Published: September 2014

Statistical energy analysis (SEA) method is an adequate tool to solve complex problems to building acoustics. This research on the application in variety of the building materials as the subsystem of SEA model is performed. For the purpose to explore the relationship between the building element and its mode, these commonly used building materials are selected to determine this relationship. It is indicated that the properties of building material have obvious effect on the modal density and modal overlap of building members. As the consequence, a useful technique to account for a building member to be appropriate for a SEA (statistical energy analysis) subsystem is presented.
Simulation Analysis on Sun-Shading Design Case of Buildings in Cold Regions
Authors: Cui Yan Qiu , Sun Nan , Peng Yun Long , Wang Yang
Published: September 2014

The sun-shading design was carried out based on a comprehensive building in a cold region. The reasonable building sun-shading design method in combination with the regional and facade characteristics in the cold regions is discussed, meanwhile, the unit-area refrigeration power consumption of the room and the annual building energy consumption before and after sun-shading setting are analyzed with simulation software. It is proposed that in the cold regions, designing sun-shading reasonably can reduce air conditioners energy consumption in summer, improve the indoor thermal environment and increase the indoor comfort level. This research can provides a technical reference to promote the sun-shading and building integration design and application in the cold regions.