bluuebunny/crossref_metadata_2025 huggingface dataset:
Different Gradations Cement Improved Phyllite Test Analysis
Authors: Chen Yan Qin , Zhang Hui Jun , Wang Tie Quan
Published: April 2014

The paper analyzed the phyllite properties in the highway from Shiyan-Tianshui the eastern An-kang 25th section through the related indoor and outdoor testing. As the on-site filler CBR value didnt meet highway subgrade filling on the filler mechanical properties, and it should be improved with cement. The engineering and compaction properties were analyzed under different cement doses and gradation combinations, whose result was shown that selecting the improved phyllite gradation composition of 5% cement content and 60% stone content was the optimal. In that it could not only meet subgrade strength design requirement and the on-site application, but also be the most economical and reasonable.
Analysis of Reconstruction and Reinforcement Design for a Thermal Power Plant Boiler Frame
Authors: Wu Jiang Ling , Cao Ping Zhou , Liu Cheng
Published: April 2014

It’s imperative for thermal power plant to add denitrification system. Denitrification facility is usually arranged between economizer and air pre-heater, which may unavoidably collide with vertical bracings of boiler frame. Based on the denitrification project of a power plant in north China, this paper puts forward a simplified analysis method and a practical reinforcement scheme for boiler frame which needs to remove some bracings. The method is on the basis of effects of vertical bracings on boiler frame. Three models including original structure, demolished one and reinforced one are conducted to study structural behaviour under horizontal loads in SAP2000 software. Considering that bracings between the columns bear horizontal loads mainly and increase the horizontal stiffness of frame, reinforcement design is based on the principle of equal rigidity that the horizontal floor displacement and the proportion of horizontal loads boiler columns bear are approximately same as original.
Effect of Polypropylene Fiber on the Properties of Cement Mortar
Authors: Pan Jun , Li Fei , Zhang Xue Wu
Published: April 2014

This thesis discusses the influence of fly ash content, fiber content and fiber types on the performance of fiber reinforced concrete, through the flexural and compressive tests on fiber reinforced cement mortar, and the splitting tensile and bending tests on the fiber reinforced concrete. The test result shows that the adding of fly ash can better play the enhancement of polypropylene fiber; the change of the fiber content affects the flexural strength of cement mortar and obviously improves the splitting tensile strength of the reinforced concrete; and the polypropylene fiber and steel fiber have different enhancement on cement mortar due to their qualitative differences.
Effect of Rubber Powder Dosage on Performance of Cement Concrete
Authors: Zhang Yan Cong , Liu Shao Wen , Gao Ling Ling
Published: April 2014

A number of rubber cement concrete specimens that rubber powder dosage different were obtained using same cement, water and fine aggregates, by adjusting the dosage of rubber powder. Then it was used to research the influence of rubber powder dosage on performance of cement concrete by measuring its liquidity, strength and toughness. The results show that: when water-cement ratio was equal and rubber powder replacing the same volume sand, the fluidity of cement concrete almost linear increased with rubber powder dosage increasing. With dosage of rubber powder increasing, compressive strength and flexural strength reduced, but toughness linear growth trend when dosage of rubber powder less 30%.
Experimental Research on the Freeze-Thaw Resistance of Basalt Fiber Reinforced Concrete
Authors: Fan Xiao Chun , Wu Di , Chen Hu
Published: April 2014

Basalt fiber reinforced concrete has excellent basic mechanical properties. It has become a hot topic of engineering studies. Based on the freeze-thaw resistance of durability indices, through the comparative experiment on the dynamic elastic modulus and mass loss of plain concrete and basalt fiber reinforced concrete in the freeze-thaw cycles, this paper had discussed the impact of basalt fiber on the freeze-thaw resistance of concrete, and have considered whether the specimens were mixed with fly ash. The results showed that basalt fibers can improve the freeze-thaw resistance of concrete specimens significantly. After 100 freeze-thaw cycles, the dynamic elastic modulus of basalt fiber reinforced concrete specimens was 1.47 times as much as that of plain concrete specimens, and mass loss of basalt fiber reinforced concrete specimens was 0.64 times as much as that of plain concrete specimens. Fly ash had an influence on the freeze-thaw resistance of basalt fiber reinforced concrete. In engineering applications, the mixing amount of fly ash should be taken into consideration. This research had a certain reference value on the engineering applications of basalt fiber reinforced concrete.
Improving the Impact Resistance of Reinforced Concrete
Authors: Abbas Husain , Almusallam Tarek , Al-Salloum Yousef
Published: April 2014

The strategic concrete structures are often required to resist impact loads arising from the projectile strike, falling weight, blast generated missile etc. The existing structures found deficient in resisting these loads are required to be retrofitted whereas the upcoming structures are required to be designed for expected impact loads. This paper explores the ways of strengthening existing reinforced concrete (RC) structures using externally bonded carbon fiber reinforced polymer (CFRP) sheets and improving the impact resistance of concrete by mixing hybrid fibers in its production. The impact response of concrete structures is assessed using experiments involving the impact of projectiles of different nose shapes on slab specimens. The material behavior at high strain rate is established using split Hopkinson pressure bar (SHPB) testing at varying strain rates. Analytical models are developed for predicting penetration depth, scabbing thickness, ballistic limit velocity and ejected mass. The experimental results were also validated through numerical modeling using LS-DYNA.
Orthogonal Experiment Studies on Mix Design of SFRHSC
Authors: He Dong Qing , Wang Jing Ge
Published: April 2014

Adopting orthogonal design method in the SFRHSC mix design, only a few experiments would be needed in the study on many influential factors with different level in mix design. The authors studied the SFRHSC mix design of a long-span shell construction as an example, analyzed the influential patterns of SFRHSC workability and strength with different additives. The significance of influential factors were determined by the experiment, and better mix design which meet the design and construction requirements was obtained. The approach to applying mathematic statistics in the mix design of the SFRHSC plays significant role in the material study and engineering practice. The results of experiment study can be reference to other similar projects.
RCM Method Practicability Study of Concrete Chloride Ion Permeability Resistance
Authors: Huang Zhi De
Published: April 2014

RCM method working principle, apparatus and procedures were briefly introduced, the existing problems were analyzed, the authenticity of testing concrete chloride ion permeability resistance were analyzed from the aspects of timeliness and, the practicability combining with actual application and experimental study, the application occasion and concrete durability level was put forward.
Performance Based Optimized Design of Steel Structure
Authors: Zhang Lan Lan , Song Xiao Guang , Zhang Jing Juan
Published: April 2014

During the past two centuries, steel structure has become one of the most popular structural system. How to balance the construction cost, structural properties and other factors is an important aspect needed to be addressed. This paper describes the whole process of performance based optimized design of steel structure. First, the methods on the shape and sizing optimization, cost and others are introduced. Then, the multi-object optimization of steel structure is presented, in which the main aspects of the optimizations are studied. Finally, the design principle and the analytical steps for the multi-object optimization of steel structures are discussed. This paper can be references for the optimization design of steel structures.
Mix Proportion and Mechanical Properties of Recycled PET-Brick Powder Mixture
Authors: Meng Fan Bo , Hu Yi Zhang , Yue Hong Ya
Published: April 2014

This research determined the proper gradation of clay brick powder, PET to clay brick powder ratio, and curing temperature. Density, compressive, and tensile strength of the PET-Brick Powder Mixture were also studied. The research results indicate that the mixture had lower density and water absorption. The strength increased quickly and reached the 94% of 28-day strength at 6 hours. The proper initial curing temperature is 180°C.
A New POM-Based Supramolecular Compound: Synthesis, Structure and Adsorptive Property of [Cu(phen)2]3[W6O19]
Authors: Liu Ya Bing , Wang Hong Jie , Zhao Hong Kai
Published: April 2014

A POM - based organice - inorganic hybrid compound with the chemical formula of[Cu (phen)2]3[W6O19] (phen = 1,10-phenanthroline) (1) has been hydrothermally synthesized andstructurally characterized by the elemental analysis, and single crystal X-ray diffraction. Compound 1 crystallizes in the monoclinic space group C2/c with a =18.319(4) Å, b = 17.311(4) Å, c = 22.248(4) Å, β = 112.40(3) o, V = 6523(2) Å3, Z = 4, R1 = 0.0448, and wR2 =0.1218. Compound 1 consists of the [W6O19]3- building blocks and [Cu (phen)2]+ metal organic cationic moieties, which are packed together via the extensive hydrogen-bonding interactions to form a three-dimensional supramolecular framework. The adsorption of methylene blue (MB) under UV irradiation with 1 as the heterogeneous adsorbent has been investigated, showing a good adsorptive property of 1 for MB degradation.
Comprehensive Evaluation on Effects of Strengthened by Bonding Steel Plate or CFRP Based on Analytic Hierarchy Process
Authors: Mao De Jun , Liu Fei Cheng
Published: April 2014

Pasting steel plate and CFRP are two methods which are usually applied to bridge reinforcement engineering. In order to make a comprehensive evaluation of the effects of the two strengthening methods, two groups of reinforcement testing that simple supported RC beams were preloaded to cracking under the same conditions are conducted, and then reinforced by bonding steel plate or CFRP on the tensile side and increasing section area on the pressure side, to study the strengthening effects of the two methods. Then according to the technical characteristics and contrast test research results, by using the basic ideas of analytic hierarchy process, establishing two levels comprehensive appraisal index system, to evaluate the strengthening effect of the two strengthening methods, the evaluation results show that the performance of pasting steel plate comprehensive is better.
Effect of Tb3+-Coped Concentration on Properties of Li2SrSiO4:Tb3+ Phosphor
Authors: You Panli
Published: April 2014

A series of Tb3+-doped Li2SrSiO4 phosphors were prepared by high temperature solid state reaction. Effect of Tb3+-coped concentration on luminescence properties of Li2SrSiO4: Tb3+ phosphor was investigated by XRD, FTIR, PL and CEI measurements. The results showed that the unit cell constant of Li2SrSiO4:Tb3+ was reduced gradually with increasing Tb3+ concentration, and then the FTIR absorption intensity assigned to the stretch vibration of [SiO4] and bend vibration of Si-O was decreased. The emission properties of Li2SrSiO4:Tb3+ phosphors are strongly dependent on the concentration of Tb3+. The stronger blue and weaker green emission were shown as adding 1% Tb3+ amount, while single bright green emission was presented in 20% Tb3+ contents. The corresponding CIE was observed from (0.192, 0.315) to (0.246, 0.599). The results showed that the luminescence properties of Li2SrSiO4:Tb3+ phosphor could meet various requirements by tuning the Tb3+-doped concentration.
Experimental Analysis of Minimum Ignition Temperature of Dust Cloud Obtained from Thermally Modified Spruce Wood
Authors: Zigo Jaroslav , Rantuch Peter , Balog Karol
Published: April 2014

This article deals with study of minimum ignition temperature (MIT) of thermally modified spruce dust. Dust of several species of spruce was mixed, sieved, dried and subjected to Thermo-S temperature programme. Samples of dust (200 250 μm) were tested in Goldbert-Greenwald furnace apparatus for determination of the MIT of dust clouds. The influence of air pressure and sample weight to the MIT was studied. The results show that the MIT of thermally modified spruce dust gradually decreases as the sample weight and air pressure rise. The lowest value of MIT (470 °C) was measured, when the air pressure was 50 kPa and the sample weight 0,5 g. To reach even lower values of MIT (˂468 °C), the air pressure should gradually rise to approx. 42 46 kPa and the weight of dust sample should be approx. 0,46 0,53 g.
Influence of Fiber Embedded Length on Properties of Single Fiber Pull-Out Test
Authors: Zhang Ya Fang , Chen Pei Ran , Liu Hao , Wu Qing Hua
Published: April 2014

The reinforcing and toughening effect of fiber reinforced concrete (FRC) are mainly under control of the interfacial bond strength in between of fiber and concrete, and the embedded length of fiber is one of the significant factors for interfacial bond strength. In this paper, pull-out numerical models based on single steel or polypropylene fiber have been studied with the fiber embedded length set as a variable and the influence of fiber embedded length on properties of single fiber pullout has, therefore, been analyzed. The results indicate that the longer the fiber embedded length, the larger the peak index and pull-out toughness of single fiber pull-out specimen could be reached, while the interfacial bond strength would decrease. The variation of fiber embedded length has only a little impact upon the damage process of pullout. Finally, the test results for specimen with the polypropylene fiber is more sensitive to the changes of embedded length compared those with steel fiber
Investigation on Basic Properties of Rice Husk Ash – Blast Furnace Slag Composite Binder
Authors: Zha Jin , Li Jin Hui , Jiao Yun Pan , Zhou Shao Hao
Published: April 2014

This paper studies the changes of composite binder basic properties caused by the addition of processed rice husk ash and blast furnace slag. Experimental results show that the fineness and pozzolanic activity of rice husk ash, slag in appropriate treatment are according to using standard. This novel composite binder becomes a little worse in availability performance, while its long-term strength is equivalent with normal cement.
Preparation and Characterization of Hyperbranched Polymer
Authors: Zhou De Jie , Han Nian Feng
Published: April 2014

Hyperbranched polymer was prepared by the polycondensation reaction via the A2+B4 route. The polymer was obtained by the reaction of 1,3-tetramethyl-1,3-bis (methyl-dicholorosilyl) ethyl disiloxane and di-tert-butyl adipate. The obtained polymer was soft solid. The polymer was characterized by 1HNMR and IR spectroscopies. The1H NMR and IR analysis proved the existence of the branched structures in the polymer.
Project for Improving Dark Color Fastness of Polyester or Spandex
Authors: Zeng Xian Ping , Liu Jin Fa
Published: April 2014

In this paper, an analysis of dark color fastness technology of polyesters or spandexs dark color fabric was done. Through the analysis, corresponding solutions were providing to enhancing the washing dark color fastness of polyesters or spandexs synthetic elastic fabric, how to surmount the dark color fastness difference in polyester or spandex, and result is poor in white dyes combination of polyesters or spandexs fine white finished fabric
Ultrasonic Synthesis of Ag2Se Nanocrystal in Perrhenate Solution
Authors: Shan Wei Jun , Yan Qiang , Li Du , Fang Da Wei , Zang Shu Liang
Published: April 2014

Ag2Se nanocrystal was successfully prepared by ultrasonic synthesis in water and ethanol systems at an ambient pressure. The powder of selenium was used as the selenium ion source. The size of the nanocrystals is in the scope of 10-20nm. The products were characterized by some means including X-ray Powder Diffraction (XRD) and Transmission Electron Microscopy (TEM) which was used to study the thermostability of the product. The result of the experiments indicated that the concentration of the reactant, the pH of the solution, the react temperature and the surfactant had some important influence on the formation and the size of the Ag2Se nanoparticles. The method we reported here is proved to be a new and an easy way to prepare the nanocrystals of metal chalcogenide.
The Teaching Practice of Consolidation Experiment Based on the Data Acquisition System
Authors: Zhao Yu Ling
Published: April 2014

Soil mechanics is based on mechanics, researching characteristics of soil. It include the calculation of deformation and stability of soil. The consolidation experiment is an important method for the determination of resistance to deformation and strength of foundation soil. We can know the compressibility and compression modulus of the soil by the experiment. In order to ensure the economy and safe of the structure, we calculate the final settlement using the elastic theory method and foundation specification method. Base on the experimental teaching platform of geotechnical experiment microcomputer data acquisition system, student can master steps of consolidation experiment. Besides, it can mobilize students’ seeking knowledge desire and profound understanding value of course.
Investigation of the Processes of Nitrification and Denitrification in Wastewater Treatment
Authors: Gogina Elena S. , Ruzhitskaya Olga A. , Yantsen Olga V.
Published: April 2014

The paper presents the results of scientific work dedicated to the removal of ammonia nitrogen from wastewater. On the basis of the results of research were built characteristics of the process of biological treatment with nitrification and denitrification of. The paper presents charts showing the operation of the cleaning system with nitrifying bacteria heterotrophs.
Removal of Phosphates from Wastewater and Intensify the Biological Wastewater Treatment Process from Organic Pollution
Authors: Ruzhitskaya Olga A. , Gogina Elena S.
Published: April 2014

The paper presents the results of research studies to determine the degree of influence of reinforced material on the purification process wastewater from phosphates and organic contaminants. The paper presents the results of mathematical description of the laws of the biological purification. Obtained activation coefficient. Shows the effect of reinforced material for phosphate removal from wastewater. Shows the effect of reinforced material on sludge dose and sludge index.
Hydrothermal Synthesis and Characterization of POM-Based Photocatalyst for Degradation of Pollutant Organic Dyes
Authors: Liu Ya Bing , Wang Hong Jie , Zhao Hong Kai
Published: April 2014

The activated photocatalysts are urgently needed for the application of photocatalytic techniques in environmental pollutant removal. A POM - based photocatalyst with the chemical formula of (4, 4’-H2bpy)( 4, 4’-Hbpy)2[SiW12O40]·4H2O (1) has been hydrothermally synthesized and structurally characterized by the elemental analysis, and single crystal X-ray diffraction. Compound 1 consists of 4, 4’-bipyridine unit and keggin type polyoxometalates [SiW12O40]4-. There are hydrogen-bonding interactions between polyoxometalates, 4, 4’-bipyridine and water molecules in 1, forming a new 3-D networks. The degradation of rhodamine B (RhB) under UV-vis irradiation with 1 as the heterogeneous photocatalyst has been investigated, showing a good photocatalytic property of 1 for RhB degradation.
Study on Dynamics of Eco-Tourism System
Authors: Liu Yu Mei , Dong Yu Dan , Wu Jing
Published: April 2014

This paper studies the introduction of the system dynamics method evaluation process among eco-tourism carrying capacity, improve the eco-tourism carrying capacity assessment methods and systems, eco-tourism management departments to make an accurate assessment of eco-tourism system supports eco-tourism activities capacity thresholds and event risk, according to the carrying capacity of eco-tourism environment to determine the strength of eco-tourism activities, protect the environment and ensure sustainable development of eco-tourism.
Three Vertical Flow Constructed Wetlands Filled with Different Packing Materials for Piggery Wastewater Treatment
Authors: Xiong Shui Ying , Ge Jiang Nan , Wang Shen Wei , Qiu Mu Qing
Published: April 2014

Seasonal performances of three vertical2flowconstructedwetlands (VFCWs) filled with different packing materials for piggery wastewater treatment was investigated. Results showed that there were no some significant seasonal differences in the COD removal efficiency among three types of VFCWs. Biodegradation of organic matter in all three VFCWs were found following the first order rate model. The N removal efficiencies in conventional VFCWs indifferent seasons constantly maintained at 52%. However, N removal efficiencies were found fluctuating over seasons in VFCWs filled with zeolite or zeolite cinder, 89.8% and 93.4% in autumn, 64.2% and 73.5% in winter, and around 80% in spring and summer, respectively. Total nitrogen (TN) removal efficiencies of all VFCWs in winter were considerably lower than those in the other seasons due to relatively weaker processes of nitrification-denitrification. The nitrification activity in VFCWs filled with zeolite2cinder was the highest among all of VFCWs, while the denitrification activity in VFCWs filled with zeolite or zeolite-cinder was more in tensive than that in the conventional VFCWs, agreeing with the TN removal efficiencies in three VFCWs. As packing material, zeolite is able to accelerate the process of denitrification as well as TN removal efficiencies of VFCWs.
System Analysis of the Distance Education Examination System
Authors: He Hong , Han Hong Cai , Li Heng
Published: April 2014

Through the survey involved various types users of distance education online examination system, analyzed from the five aspects: requirements analysis, system modeling, functional requirements, physical architecture requirements, information flow of the examination system. The system can take advantage of network, reduce test cost, making remote examination not restricted by time and space and the evaluation results more accurate and objective.
Study on Collapse Numerical Simulation Method of Frame Structures Based on Explicit Dynamics
Authors: Hu Kai
Published: April 2014

According to the theory of collapse numerical simulation, the explicit finite element algorithm based on explicit dynamics was chose as the numerical calculation method. And combined with the plane RC frame collapse test and the example of ten layers frame structure, the wire frame model, integrated model and separate model were established and the alternate path method was adopted to study the simulate method of structural collapse. With the comparison of several aspects to the results, the rationality of the numerical simulation method and the applicability of the numerical models were verified respectively. At the same time, according to the complex pre-treatment process to the numerical simulation of structural collapse, an MFC program with the function of exporting APDL file which can generate wireframe models for structural collapse simulation in ANSYS/LS-DYNA was developed using VC++ language with the purpose of offering convenience to the numerical simulation process of structure collapse.
Axial Strains in FRP-Confined Normal- and High-Strength Concrete: An Examination of Strain Measurement Methods
Authors: Vincent Thomas , Ozbakkloglu Togay
Published: April 2014

This paper presents an experimental investigation into the axial strain measurement method of fiber reinforced polymer (FRP)-confined normal-and high-strength concrete (NSC and HSC). A total of 15 FRP-confined concrete specimens with circular cross-sections were tested under monotonic axial compression. Axial strain recordings were compared on specimens instrumented with three different measurement methods: axial strain gauges and full-and mid-height linear variable displacement transformers (LVDTs). The ultimate conditions are tabulated for each measurement method and key experimental outcomes discussed. The results indicate that axial strains of FRP-confined HSC are highly sensitive to the instrumentation arrangement and significant differences occur in the results obtained from different measurement methods.
Test Scheme and Result Analysis of New-Type Frame Structure with Column End of Steel-Concrete Composite Joint
Authors: Lu Guan Hong , Wang Zhan
Published: April 2014

The frame column and frame structure with column end of steel-concrete composite joint is a new-type architectural structure. To obtain the mechanical property of the new-type frame column and frame structure, comparative tests between 6 new-type columns and 3 ordinary columns and comparative tests between new-type frames and ordinary frames are carried out. This paper elabrately introduces the specimen design, experiment load, test program, test results and others. Thus, the transformation and failure characteristics of new-type long and short columns at different axial compression ratios and the transformation and failure characteristics of new-type grames at different prestresses are obtained. They are respectively compared with the ordinary long and short columns and frames. Results show that the seismic performance of the new-type column and frame structure is obviously superior to that of the ordinary ones. The tests can achieve the expected test objectives and are proved successful.
Transverse Free Vibration of Timoshenko Beams Resting on Viscoelastic Foundations
Authors: Peng Li , Wang Ying
Published: April 2014

The complex modal analysis is developed to study the transverse vibration of Timoshenko beams resting on viscoelastic Pasternak foundation. Complex frequency equations and modal function expressions are obtained for pinned-pinned ends. In numerical examples, the characteristics of natural frequencies and decrement coefficients of Timoshenko beams are compared with Euler-Bernoulli beams. The numerical results show that with increase in the length, the natural frequencies of Timoshenko beams are slightly less than Euler-Bernoulli beams, and the decrement coefficients of Timoshenko beams are not constant as that of Euler-Bernoulli beams.
RPC Pole Composite Cross Arm Design and Wind-Induced Dynamic Analysis
Authors: Ju Yan Zhong , Tong Nian , Wu Qi
Published: April 2014

The author puts forward a new insulation cross arm, uses the insulation and high strength composite materials (FRP), to replace the steel applied to the RPC pole cross arm, this not only has a full bar maintenance-free features, and can shorten transmission corridor again, for the construction of resource intensive transmission lines has important practical significance. In addition, this paper uses finite element analysis software ANSYS, considering the influence of fluctuating wind, in the modal analysis and dynamic response illustrates the actuality of cross arm application of composite materials.
The Strain Change Rules of Full-Scale High Strength Concrete Frame Columns with High Axial Compression Rations
Authors: Zhang Guo Jun , Jia Yong Bin , Lu Xi Lin
Published: April 2014

Based on experimental study of 9 full-scale high-strength concrete(HSC) rectangular frame columns with high axial compression ratios, high-strength longitudinal reinforcements and transverse reinforcements and rectangular interlocking ties, their strain change rules of longitudinal reinforcement, stirrups and concrete were discussed and analyzed. The main results indicate as follows. The maximum tensile strain of longitudinal reinforcement decrease and the tensile strain of concrete increase quickly as the axial compression ratios and the strength grades of concrete are higher; the strains of outer stirrups are all the time greater than those of inner stirrups; the single brace stirrups have the same action with the closed stirrups.
Upheaval Buckling Analysis of Buried Offshore Pipelines under High Temperature and High Pressure
Authors: Liu Peng , Wu Shi Yuan , Kang Le
Published: April 2014

Nonlinear finite element upheaval buckling model of buried offshore pipelines under HT/HP is built using ABAQUS. The petroleum is defined as uniform flow; temperature field of offshore pipelines produced in the process of petroleum transportation is obtained by heat transfer analysis; offshore pipelines are buried in trench of sandy seabed, interaction between seabed and offshore pipelines is defined as friction, seabed interaction with offshore pipelines will limit the movement of offshore pipelines; coupled fluid-structure analysis for three phase model of oil-pipe-soil is conducted to obtain stress under HT/HP. Initial imperfection of pipeline is introduced to calculate upheaval buckling of buried offshore pipeline under HT/HP. Through numerical analysis, the axial force of pipelines under HT/HP is obtained and thus resulted in upheaval buckling.
Structural Diagnosis of a Historic Tower Hit by Earthquake
Authors: Dal Cin Alessandra
Published: April 2014

The paper presents a critical analysis of the structural response and the level of damage of a historic tower of Santo Stefano of Sessanio that was hit by the main L Aquila earthquake of April 2009. A FE model was constructed to simulate the structural behaviour during the seismic event. The presence of a reinforced concrete slab in the upper part of the tower probably cause a different dynamic behavior compared with the lower masonry circular walls. Have also been investigated boundary conditions at the base, the different mechanical property of masonry and the contribution of the stiffness of the wooden floors.
Analysis of Displacement Influence Line Characteristics of Simply Supported Beam with Local Damage
Authors: Sun Ke , Zhang Yan Qing
Published: April 2014

According to energy principle, the influence line equation for displacement at any point of simply supported beam with local damage was derived. Based on the load symmetry positions’ difference of influence line for displacement at midspan point, a index that detects the local damage of simply supported beam without initial data was proposed. The influence line characteristics of simply supported beam with local damage were theoretically analysed. Through further numerical experiments, the sensibility of the influence line for displacement at midspan point was analysed when a local damage is in different location of the beam respectively. The equations and numerical experiments show that the index peak appears in the damaged area and the additivity of multi-damage index is proved. Using the facile and accurate displacement information in engineering, this algorithm provides some reasonable suggestions for the damage detection and analysis of this kind of structure.
Detection and Monitoring Technologies of Bridge Cable Force and Disease
Authors: Zheng Yi
Published: April 2014

Investigation is carried out aiming at analysis of bridge cable detection and monitoring. Detection and monitoring technology characteristics are summarized, while technology advantages and disadvantages analyzed. Dynamic detection technology of cable force is used most often. Effects of various factors of this technology are analyzed. Cable structure internal and external injury detection technologies are analyzed. Nondestructive testing technology specific comparison is carried out, the advantages and disadvantages of each technology and application. Nondestructive damage detection technique prospect is presented.
Ubiquitous Sensor Network for Construction Site Monitoring
Authors: Shin Jae Min , Kim Sang Yong , Kim Gwang Hee , Jung Min Gu , Shin Dae Woong
Published: April 2014

The importance of construction monitoring trend is required rational method to take health and safety and effective maintenance control from uncertainity and associated risks. Thus, timely field monitoring can overcome the gap between the prediction and real situation through the analyzing validity for the construction. This study suggests automated monitoring system with three kinds of communication methods to achieve effective operation of the system. The example of case study helps to easily understand for practical application with use of the mobile phones.
Experimental Investigation on Axial Compressive Behavior of Masonry Column Strengthened by SGFRP
Authors: Zhang Zhi , Gu Qian
Published: April 2014

3 masonry columns were strengthened by Sprayed Glass Fiber Reinforced Polymer (SGFRP), and a research of the seismic behavior of them tested by axial loading experiment was presented. The failure modes of the specimens were described, and the data about the load capacity and deformations of masonry columns strengthened by SGFRP were gathered during the experiment. The results showed that the ultimate loads of the reinforced columns increased greatly, and the deformation capacity and the ductility of the columns improved significantly too. Comparing the strengthening effects of the columns when the thickness of strengthen layer and the length of the glass fiber are different, the most effective and reasonable reinforce suggestions are proposed.
Experimental Study on the Bonding Behavior of GFRP-to-Brick Interface
Authors: Zhao Jing , Sun Wen Bin , Zhu Qiang Qiang , Yong Hong Bao
Published: April 2014

The performance of the interface between FRP and masonry is one of the key factors affecting the behavior of the strengthened structure. A challenge is to better understand the potential failure modes, which are generally directly related to the interfacial behavior between the FRP composite and the masonry in masonry walls. In this research, the experimental program was focused on the bond behavior of GFRP strips externally bonded (EB) to brick masonry.
Reinforcement Planning Decision of Old Bridge Based on TOPSIS-AHP Method
Authors: Liang Xiao Fei , Xu Yue
Published: April 2014

The application of technique for order preference by similarity to ideal solution(TOPSIS) and analytic hierarchy process(AHP) in reinforcement scheme optimization for bridge is investigated in order to select the optimal scheme from several primarily feasible ones. This paper calculates every index through AHP and applies the improved TOPSIS method to normalize and sort the evaluation index values. Integrating TOPSIS and AHP may Consider both the subjective intentions of policy makers, but also to a certain extent, to avoid arbitrariness.A real project demonstrates that this method is effective and feasible.
The Concrete Protective Effect of Silane Impregnated Materials with Different Molecular Chain Structure
Authors: Wang Hong Song , Wang Wei , Wang Rui , Wang Wen Bin , Li Lei , Tian Qian
Published: April 2014

The concrete building protection materials is widely used in the hydraulic and bridge engineering. It was found that integral silane treatment can improve the durability of concrete.Compared with other protective methods, Silicone protect materials is the most convenient and environmentally-friendly.The silicone materials can effectively block the invasion of harmful substances such as water and chloride ions, and prevent the occurrence of the freeze-thaw damage. Few studies reported the protective effects of silane material which have different molecular structures .We found that Silane with relatively long molecular chain structure have a slower evaporation rate .When the concrete surface treated with such a silane material,the concrete surface has a 22% longer time to dry, so that the depth of penetration increased 16% for a longer concrete infiltration reaction time. we also studied the impact of temperature and humidity on the drying time of silane material , found using a suitable surface moisture conditions can get better protection.
Safety Evaluation of Reinforced Concrete Girder Bridge after Strengthened with Pasting Technology
Authors: Zhao Zhi Meng , Liu Ke Da , Chai Jin Yi , Lei Le Le , Wang Qi , Qi Xiang Sheng , Liu Run Xing
Published: April 2014

This paper examines the load capacity and safety of reinforced concrete beam bridge strengthened with pasting steel plates and carbon fiber polymer technology, taking the Longwanggou Bridge built in Jungar Qi in 1980s,a coal-rich area in Inner Mongolia, for example, in accordance with the Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts (JTG D62-2004), and the Code for Design of Highway Bridge Strengthening (JTG /T J22-2008). The girders in superstructure of this bridge were strengthened by using pasting steel plate technology, while the capping beams of piers and abutments using combined technology of sticking steel plates and carbon fiber reinforcement polymer (CFRP). At the same time, the deck pavement and the expansion joints were replaced, with adjusting the continuous form of the bridge, to improve the integrity and its driving comfort. The results from the theoretical analysis and dynamic and static load tests on the bridge after strengthening have shown that it is safe and good in the integrity and reliable in the load capacity.
Experimental Study on Influence of Bending Load on Chloride Ion Concentration of Concrete in Marine Environment
Authors: Jin Han Yang , Zhuang Hua Xia , Liu Ru Tai , Shi Jia Le , Zhang Jun Zhi
Published: April 2014

This paper mainly determined free chloride ion concentration of concrete beams of two kinds of water cement ratio (0.45and0.60) and bending load (0.00Fmax, 0.30Fmax, 0.45Fmax and 0.60Fmax) after 240 d in marine environment and compared the effect of different load conditions in the same water cement ratio on the free chloride ion concentration. The results show that the concentration of free chloride ion in tension zone of concrete increases with the increase of load level, the concentration of free chloride ion in compressed zone of concrete decreases with the increase of load level; under the same bending load level, the concentration of free chloride ion in concrete increases with water cement ratio.
National Road 209 Line Shibi Mountain Bridge Concrete Anti-Carbonation Performance Analysis
Authors: Liang Hong , Liang Xiao Dong , Du Wen Long
Published: April 2014

Concrete carbonation resistance is an important embodiment of concrete durability. This article takes National Road 209 line the Shibi Mountain Bridge as the research object. A series of carbonation experiments were did to test the concrete durability. The results show that: under a certain mixing radio, the concrete of T beams, bridge deck, pad stone and thin-walled pier taken from the Shibi Mountain Bridge, which was added admixtures, has a less carbonation depth. According to the theoretical calculations, protective layer resists the carbonation erosion effectively which gives a good protection on steel reinforcement.
Safety Assessment of Large-Scale Crude Oil Tank after Fire Process
Authors: Wang Wen He , Li Hai Xia , Xu Zhi Sheng , Liang Dong
Published: April 2014

In recent years, the demand of the crude oil is increasing in the world, and the oil storage tanks are also developing larger and larger. Higher requirements of safety for storage tank, especially safety evaluation of the oil tanks in fire environment, was proposed because the oil tank volume is large, as well the oil is volatile, flowing, inflammable and explosive easily. In the paper, the fire process was simulated by the heat treatment for the key position, and the relationship between mechanical property and heating temperature of large tank after fire was obtained. The strength evaluation for large-scale crude oil storage tank after fire was implemented and the result showed that the strength for large crude oil tank was satisfied with requirement.
The Effect of Section Optimization on the Double Nonlinear Global Stability of Latticed Shell
Authors: Chen Shi Ying , Liu Xiu Zhi , Wang Hong Li , Lu Xiao Yang
Published: April 2014

In order to grasp how the sectional sizing optimum design imposes effect on the global stability of latticed shell, with an example of K6 single-layer reticulated shell whose span is 60 meters and vector height is 6 meters, the impact of different ways in rods grouping and valuing sectional size on bars buckling discipline and mechanical performance was analyzed. Factors like the strength and slenderness ratio of members, local and overall stability of structure are entirely taken into account to guarantee the accuracy of the analysis results. The results show that optimum design of sectional sizing on single-layer latticed shell can reduce the steel consumption, change the buckling discipline and improve the ultimate stable bearing capacity of structure, but simultaneously it would bring about a smaller deformation, and no significant early warning of damage comes up when structural instability failure occurs.
Fire Resistance of Reinforced Concrete Column Exposed to Fire with Cooling Phase
Authors: Zhao Jian Kui , Yan Peng , Li Da Peng , Liu Yan
Published: April 2014

fire resistance model of reinforced concrete column was built by ABAQUS, and the model was validated with experiment. Temperature field and fire resistance of reinforced concrete column exposed to fire with heating and cooling phase was analyzed. The results show that Temperature field of reinforced concrete column would elevate when the environment temperature descended, and deformation and internal forces became more severity.
Research on HSE Risk Assessment and Control in Oil-Gas Drilling Operations
Authors: Li Fei , Zhang Guang
Published: April 2014

As the leading of oil and gas exploration and development, oil-gas drilling operations with high investment, high technology, and other industries interchange and perennial wild characteristics, there are various HSE risks during operation. Constructing HSE risk assessment system of oil-gas drilling operations, using AHP to construct indicators were analyzed and compared, and calculate the index weight. Then build fuzzy evaluation matrix based on expert evaluation method, get fuzzy evaluation result is "high risk". Finally, from four aspects (people, object, environment, and management) proposed HSE control measures.
Study on Fire Risk Assessment on Irradiation Room under Stuck Radioactive Sources
Authors: Yao Xiao Lin
Published: April 2014

Ignition temperatures of common radiation cargo in irradiation room were measured through the experiment, minimum ignition temperature is 210 °C. In order to discuss the temperature variation under stuck radioactive sources, two fire scenarios were presented and simulated by FDS. The results show that temperatures rise rapidly when stuck radioactive sources broke out within an hour. As the growth of the time, temperatures in irradiation room are rising, but the rising rate is slowing. In fire scenario A and B, the incidents of stuck radioactive sources occur in 9 days, 4 days later, local temperatures can reach 210 °C, and radiation cargo may be ignited. The results of the research can provide reference for fire risk judgment and assessment in irradiation room.
Study on Fire Risk Assessment on Round Irradiation Room of Stacking under Stuck Radioactive Sources
Authors: Yao Xiao Lin
Published: April 2014

The typical 60Co round irradiation room of stacking has been taken as a research subject. Ignition temperatures of common radiation cargo were measured through the experiments, minimum ignition temperature is 210 °C. In order to discuss the temperature variation and temperature field under stuck radioactive sources, the fire scenario was presented and simulated by FDS. The results show that temperatures rise rapidly when stuck radioactive source broke out within an hour. As the growth of the time, temperatures in irradiation room are rising, but the rising rate is slowing. The temperature field in the irradiation room tends to be the same after two hours. The stuck radioactive source occurred after 7.2 days later, local temperatures can reach 210 °C, and radiation cargo may be ignited.
Wind Tunnel Test of Symmetrical Twin-Tower Tall Building Model
Authors: Zhang Jian Guo , Zhuang Hui Min
Published: April 2014

In this paper, taking symmetrical twin-tower tall building model as an example, a wind tunnel test with simultaneous surface pressure measurement, in 7 wind directions, was carried out. Integration of the surface pressures leads to base moment coefficient, of which the amplitude and frequency-domain characteristics were analyzed and compared with those of single tall building model. The result shows that mean value and root mean square of the interfering tower, in all wind directions, are basically the same as those of single tower, while in 0o wind direction, they differ greatly; mean value and root mean square of the interfered tower differ significantly, in every wind directions, from those of single tower. In 0o wind direction, the reduced spectrum of along-wind and across-wind base moment coefficient is greatly different from that of the single tower; in 90o wind direction, the along-wind base moment coefficient reduced spectrum for interfered tower is different from Davenport spectrum, while the peak value of across-wind base moment coefficient is half the corresponding value of single tower.
Work at Height in Safety Work Plan Management
Authors: Tureková Ivana , Tomková Viera , Bagalová Terézia
Published: April 2014

Working at a construction site is a dangerous job. It all depends on specific characteristics of this kind of work, the uniqueness of the construction site considering the conditions of the construction process, climatic and geographical environment, the level of difficulty of the construction work at height or in depth, the usage of heavy machines, the work with dangerous substances, the high number of simultaneous and consecutive processes constantly going on, the high number of employees, etc. That is why it is a duty of an employer to elaborate a Safety Work Plan, even before the beginning of the construction process, which is a crucial part of the project documentation. These documents need to cover all the general principles of the incident prevention concerning safety work. Also during the construction process, the systematic control is very important, covering all the specific aspects of the construction site. Safety work management means threats identification and risks assessment and risks control. The contribution deals with risk management at a construction site on the basis of the results of the risks analysis.
A Revised the B3 Creep Prediction Model Based on Short-Time Tests
Authors: Hu Shi Xiang , Huang Qiao , Lin Shi Feng
Published: April 2014

The calculation of structure creep effect depends on the computational accuracy of concrete prediction model. Eight groups of test data were collected and used to evaluate six different prediction models. The differences between the calculated and the test data were analyzed. Based on the analysis, the method to improve the B3 prediction model was discussed, and the examples of revised B3 prediction model by the use of short-time tests were also presented. The results show that updating the prediction model based on short-time tests can improve the accuracy of B3 creep prediction model.
An Analysis on the Deformation of an Arch Bridge under the Action of Live Load by Using ANSYS
Authors: Duan Lun Liang , Zhao Yong Ming , Wang Xue Wei
Published: April 2014

This paper introduces the analysis of three span continuous girder arch bridge under the action of live load whose middle span is concrete filled steel tube with Ansys. Through the analysis, the deformation and the maximum displacement can be got which may provide reliable reference for further study of the arch bridge.