bluuebunny/crossref_metadata_2025 huggingface dataset:
Optical Properties of CuAlO2 Synthesized by Sol-Gel Method
Authors: Lin Qing Xiang , Miao Feng , Huang Yi
Published: January 2014

CuAlO2microcrystallites were synthesized by Sol-gel method at 1200°C with Cu (CH3COO)2·H2O, Al (NO3)3·9H2O and ethylene glycol as raw materials. The phase composition,morphology,and optical properties of CuAlO2microcrystallites were chatacterized by X-ray diffraction, Scanning electron microscope,Photoluminescence and UV-visible spectroscopy respectively. The results of XRD show that CuAlO2with delafossite crystal structure is obtained. The defect emission were observed through PL spectrum test. It can be concluded that Cu-vacancy may be the possible reason of the observed activated p-type conductivity of CuAlO2. Can be found three characterized peak (λ1=290nm, λ2=410nm, λ3=430 nm) on the spectra.
Improvement of Performance of Traditional Photocatalysis and Development of New Photocatalysis Materials and Technologies
Authors: You Wei
Published: January 2014

Progresses of novel photocatalysis materials and technologies were introduced in this paper. Efficacy-strengthening technologies of TiO2photocatalysts include grain-refining and preparation of porous materials, improvement of visible light-responsive ability. Moreover, researchers are developing novel photocatalysts materials and equipments with high efficacy, novel photocatalysis materials include small gap materials, new-serie photocatalysis materials, some natural compounds, broad-spectrum photocatalysts and broad-energy and energy-sensitive catalysts, etc, in addition, high-efficacy controllable high-power environment-cleaning equipments such as high-voltage negative-ion generator and plasma generator have been developed to dispose heavy pollutants in industrial fields.
Numerical Characterization of the Effect of Coating Solid on Binder Distribution
Authors: Li Ying , Gu Wen Juan , He Bang Gui
Published: January 2014

Binder is the essential component of coating color recipe. The amount and type of latex binder has a significant effect on both the structure and chemical-physical properties of coated paper, which affect critical surface properties, e.g., print gloss, roughness, ink setting rate via liquid absorption, and print mottle The main aim of this study was to investigate the effect of coating solid on the binder distribution in the method of numerical analysis by Laser Scanning Confocal Microscope (LSCM). In this study, Rhodamine B was used to stain the binder and as the probe to characterize z-directional distribution of the binder using LSCM. The results implied that it was reliable and effective method using LSCM to characterize the z-directional distribution of binder and analyze the influence of coating solid on binder distribution in the z-direction. It could be concluded that the coating solid played an important effect on binder distribution in coated paper and low coating solid with more water accelerated binder migration to the interior of base paper, sample with 60% coating solid is good to binder distribution and coating layer forming.
Effect of Mechanical Refining Treatment on Fiber Grafting Modification
Authors: Liu Wei , Kong Fan Gong , Wang Shou Juan , Wu Qin
Published: January 2014

Cellulosic fibers, as the most abundant biopolymer on earth, are attracting more and more interesting to be absorbent for ion removal from aqueous solution due to its biodegradability and renewability. In this paper, 3-chloro-2-hydroxypropyl trimethyl ammonium chloride was used as functional agent to modify the cellulosic fibers to be absorbent for Cr (VI) in aqueous solution. Our attention in this work was aimed at the influence of mechanical refining treatment before graft on the modification as well as the absorption capability of modified fibers. The modification was carried out using refined fibers and raw fibers. The modified fibers were verified by IR analysis. The results showed that in isopropyl alcohol solution and under alkaline condition, the functional agent can be grafted onto fibers. The mechanical refining treatment of cellulosic fibers before modification can improve the grafting efficiency. The absorption capability of modified treated-fibers for Cr (VI) from aqueous solution is higher than that of modified untreated-fibers. More hydroxyl groups on the surface of fibers after mechanical refining treatment is the reason for higher absorption capability of modified treated-fibers and higher grafting efficency.
Analysis and Test: Impregnated Diamond Cutters for Oil Drilling Bit
Authors: Lan Hong , Xue Qi , Cui Cheng Yu
Published: January 2014

Systematic testing methods of the performance of diamond/metal composite drilling segments (impregnated diamond cutters) have not come into being. This article tries to test the mechanical properties, structures and component of a certain number of impregnated diamond cutters; focuses on analysis of the relationship between the performance of typical composite diamond cutters and materials’ structures, intends to study the testing methods of impregnated diamond cutters’ performance.
Manufacturing Technique and Property Evaluations of Degradable Sound-Absorption Plates
Authors: Lin Jia Horng , Shih Ying Huei , Chen Jin Mao , Lou Ching Wen
Published: January 2014

Following the high quality of life that people pursue, the requirements to air and environment are stricter. People value the quality of sleeping and public safety, thus they pay more attention to prevent noises. Noise makes people weary and distracted, and may eventually result in accidents. Therefore, this study uses polylactide fiber (PLA) and low melting point polylactide fiber (LPLA) to make sound absorbent PLA/LPLA plates, after which the tensile strength, softness, and sound absorption of the plates are evaluated.
Electromagnetic Shielding Effectiveness and Manufacturing Technique of Metal Complex Fabrics
Authors: Lou Ching Wen , Chen An Pang , Lin Ting An , Chuang Ya Yuan , Lin Jia Horng
Published: January 2014

In the research, The electromagnetic interferences (EMI) have drastically increased and can disrupt and reduce the life time and the efficiency of devices. Therefore, the electromagnetic shielding problem is become the important issue. In the research, Ni wire and Cu wire (Floodlit Enterprise Co., Ltd.) were used to make the Ni conductive composite yarn and Cu conductive composite yarn via an electrical covering machine. And the Cu conductive composite yarn was fabricated to the woven fabrics with the plain weaving. The test results revealed that the EMSE of the W/K/W complex fabrics have stable EMSE than the W/W/W complex fabrics when the laminated at the same direction. The W/90W/W complex woven fabrics were shown the best EMSE of 46.25 dB, which the test frequency is 1800 MHz.
Machined Surface Quality Improvement Measures Affecting Factors and Research
Authors: Yang Hong Cai , Wu Ming Qing
Published: January 2014

The use of mechanical products to improve performance and increase the service life of components and composition of the product processing quality is closely related to machining quality is the basis of product quality assurance. Measure of good or bad quality parts machining the main indicators are: machining accuracy and surface roughness. This paper mainly affect parts of the surface roughness factor, parts of the surface layer of the physical and mechanical properties (surface work hardening, residual stress, microstructure change and grinding burn), surface quality performance parts and other factors affecting the analysis and research to improve the quality of machined surface process measures.
Environmental Impacts Assessment of Liquid Crystal Extraction From Wasted LCD Panels
Authors: Wang Yu Lin , Hu Hai Juan , Qi Sen , Liu Guang Fu
Published: January 2014

In view of the extraction of liquid crystal from the wasted LCD panels, this paper aims to analyze the raw materials consumption, energy consumption and emissions to the environment in the extracting process based on the method of Life Cycle Assessment (LCA). The environmental impacts of the recycling procedure are assessed with the aid of LCIA（Life Cycle Inventory Assessment）method and CML2001 method provided by LCA analyzing software Gabi 4. Two ways of liquid crystal extraction mentioned in the paper are supercritical method and distilling method. The assessment results indicate: the supercritical method’s LCIA result is 3 times higher than the distilling method, but the liquid crystal extracting rate can reach 95% with a lower raw materials consumption; the environmental impacts of distilling method is lower than supercritical method, but its extracting rate of liquid crystal can only get to 50%. For industrial applications, supercritical method has greater advantages and there are more crafts to perfect for distilling method in improving the recovery rate of liquid crystal.
Calculation of the Effective Value of the Uplift Depth for the Tower Foundation in Sloping Ground
Authors: Xu Lin , Wan Yi , Jiang Peng Peng
Published: January 2014

Uplift capacity is the main design control parameter of tower foundations. There are many factors to be considered in the design of tower foundations, such as the choice of models and the combination of different factors. The research on the uplift capacity of tower foundation is mainly focused on the foundations built on flat ground, while there is no mature method for the tower foundations placed in sloping ground.
Base on the theory of earth pressure and the Mohr Coulomb law, This paper tries to establish the equations to calculate the uplift capacity of tower foundation placed in sloping ground and get the equation to obtain the effective value of the uplift depth for the tower foundation. At the end of the paper, a calculation example is presented using the simplified equation.
A Numerical Simulation of Steady-State Temperature Field of Natural Gas Engine Piston
Authors: Jing Dong Zhan , Zheng Wei Gang
Published: January 2014

In this paper, we use the finite element analysis software ANSYS to built a three dimension solid model of the piston in natural gas engine and make the digital simulation of the piston’s temperature field. By the actual measurement of indicator diagram, we calculate working process in the cylinder and heat transfer boundary condition of the piston and simulate it’s temperature field. Compared with the actual measurement of temperature distribution, we find that the research results provide theoretical basis to improve heating conditions of the piston, and will be significant to computer-aided calculation of the piston simultaneously. Analysis results show that the simulated results consistent with the actual situation. So the FEM (finite-element method) can actually reflect the temperature distribution of piston.
Design and Test of Pico Crossflow Turbine for the Generation of Electricity for Use in the Rural Area
Authors: Keawsuntia Yuttachai
Published: January 2014

Pico hydro turbine is an alternative technology for electricity generating from small hydropower. It is suitable for use in a rural area because of the constructions are cheap and the techonogies involved are conventional. This research paper presents the designing and the testing results of the electricity generating from the pico crossflow turbine, for save in a battery 12 V. A testing of pico crossflow turbine with 0.8 m diameter of wheel and a 20 blades water turbine which has a semi-circle shape at 0.1 m diameter of blade, the length of the blade is 0.8 m, tested in river, showed that the system gives the best electrical power of 145.42 watts or 3.49 kW-hr per day, enough to supply for up to 6 families of small community in the rural area and the rate of return for electricity generating at 0.023 USD per kW-hr.
The Relationship between the Period of Spontaneous Combustion and the Wind Speed
Authors: Sun Xian Long , Gao Er Xin , Wang Qiang , Xu Shan Shan , Li Chun Yuan
Published: January 2014

Based on the geological and the experimental data of the 13# coal seam of Sun-Cun Coal Mine, the relationship curve between the geothermal heat in Sun-Cun coal mine and experimental wind speed has been fit out. According this and the laboratory experiments, the relational expression between the period of spontaneous combustion in coal sample and the wind speed has been developed. The research results show that the curve of wind speed and the spontaneous combustion period fitted quadratic polynomial forms.
Suspension Optimum Design Considering Tire and Vehicle Matching
Authors: Bai Fan , Guo Kong Hui , Lu Dang
Published: January 2014

A method of suspension optimum design based on the tire and vehicle matching was introduced in this paper. Firstly, the vehicle handling stability evaluation standards considering tire matching with vehicle were determined by the subjective and objective assessment. Secondly, the quality, suspension kinematics and compliance characteristics and tire mechanics of prototype were tested. The vehicle model of prototype was built in Carsim with the corresponding experiment data. The model was verified by the results of the vehicle handling stability tests. Then a combination simulation platform was developed by making use of Isight, Matlab and Casim. Finally the optimal design of suspension kinematics and compliance characteristics and tire mechanics were conducted, taking straight running performance index, high-speed driving safety index and high-speed cornering performance index as the objective. The simulation results indicated that after optimization, the straight running performance and high-speed cornering performance of prototype could be improved.
Research and Application of Micro-Arc Oxidation Technology on Magnesium Alloy Motorcycle Key Parts
Authors: Chen Xi Di , Cai Qi Zhou , Deng Zhi Wei , Yin Li Song
Published: January 2014

The micro-arc oxidation process parameters of AZ91D Mg alloy and Na2WO4 concentration were optimized by orthogonal experiment. SEM, EDX, XRD, potentiodynmic polarization and immersion corrosion test were carried out to investigate the morphologies, phase composition and corrosion resistance of the MAO coatings. The results shown that the MAO coating are mainly composed of MgOMg2SiO4MgAl2O4,MgWO4 and a small amount of amorphous material as well as with a double layer structure, outer loose and inner denser, the proper parameters and additive concentration were: 300Hz,5.0A/dm2,50%/50% and 2.0g/l Na2WO4. The MAO coatings coated under the proper condition on AZ91D Mg alloy motorcycle parts provided the far batter corrosion resistance than the substrate, suggesting that MAO coatings can effectively protect the motorcycle parts against the erosion from corrosion medium. Meanwhile, it also found that the irregular part shape has some influence on the coatings formation as well as corrosion resistance.
Study on the Influence of Gear Rattling on Pitting Fatigue Failure
Authors: Shen Gang , Xiang Dong , Xie Ning , Mou Peng , Yang Wei , Zhao Qiang
Published: January 2014

The pitting fatigue failure is one of the main gear failure modes, and it has extremely important significance in studying on the influence of dynamic characteristics on pitting fatigue failure. The article has set up increasing-speed test-bed, using photoelectric encoder and NI DAS to measure and collect rotational-speed pulse of driving wheel and driven wheel. Arc-length difference and rotational-speed difference of driving wheel and driven wheel are analyzed to verify gear rattling phenomenon under increasing-speed transmission. And then gear surfaces under certain cycles are observed and analyzed utilizing surface mapping microscope to explore the influence of gear rattling on pitting fatigue failure under increasing-speed transmission. It is shown that there is rotational-speed difference between driving wheel and driven wheel, which indicates that gear rattling phenomenon appears in the meshing process, or more precisely, gear rattling phenomenon appears on both surfaces of the tooth because rotational-speed difference fluctuates bilaterally. In addition, tooth surface contact stress is 221.3Mpa, in theory, if actual contact stress is less than fatigue limit, pitting fatigue failure should not occur. However, through gear surface observation, pitting phenomenon authentically appears with the tendency from micro pitting to destructive pitting. In a word, gear pitting fatigue failure is induced by gear rattling to a certain extent.
Lightweight Design for Coal Mine Rescue Robot’s Swing Arm Brackets
Authors: Wang Chuan Wei , Ma Hong Wei
Published: January 2014

By analyzing the force of the Coal Mine Rescue Robots swing arm brackets, the maximum torques of the Coal Mine Rescue Robots swing arm brackets are calculated, the results are applied into finite element model, the maximum stress of brackets are much smaller than allowable stresses of the materials, so there is a large optimise space. Optimum design of Swing Arm Brackets are carried out by changing materials and dimensions. After simulating analysis, it can be seen that the lightweight design for out-bracket have better effect through cutting out materials rather than changing its materials. The results of this optimization may conserve materials and reduce energy consumption. And it has significant in successfully applying the robot into the coal mine underground after disasters and improving the using time of the batteries.
Crane Wheel-Rail Contact Stresses Research Based on Experimental Test and Finite Element Analysis
Authors: Wu Feng Qi , Zhang Jin , Yao Wen Qing
Published: January 2014

The wheel-rail contact is a boundary condition highly nonlinear complex problem, which need to accurately track the wheel-rail movement and the interaction contact stress between wheel-rail before and after the occurrence of wheel-rail contact, nonlinear contact stress of wheel-rail is analyzed through the contrast of finite element analysis and the actual detection, the experimental and theoretical calculation results show the compliance of the finite element model of wheel-rail, at the same time also point out some differences of theoretical calculation and actual manufacturing, which establish the theoretical and experimental foundation for the advanced research movement friction etc..
Application of Sonic Nozzle in Unsteady Flow Rate Generating System for Compressible Fluid
Authors: Wang Xiao Xin , Wang Tao , Wang Jun Zheng
Published: January 2014

To meet the requirement of unsteady flow rate generating system for compressible fluid, an inlet flow rate control method with sonic nozzle is proposed. When inlet flow rate is known, feedback of unsteady flow rate can be obtained by an isothermal tank. A proper sonic nozzle is designed according to the technical requirements, and the flow rate is calculated. Open loop experiments are carried out on generating system with and without sonic nozzle. The results indicate that influence of downstream on upstream can be greatly reduced by the designed sonic nozzle, and accurate feedback of unsteady flow rate is ensured.
Modeling and Simulation of a Certain Warship Diesel Engine Based on AMESim
Authors: Quan Xiao Hong , Quan Jian Jun , He Hui
Published: January 2014

As the power source of warship, diesel engine determines the dynamic performance of the whole warship. In this paper, a simulation model of MAN B&W7S80MC low-speed two-stroke marine diesel engine, used by certain warship, is developed. Simulation analysis is carried out based on LMS Imagine.Lab AMESim. The simulation results show that the model has good accuracy and dynamic characteristics, thus the model can simulate for control design, performance analysis and simulation of the power source of warship.
Analysis of Microstructure and Mechanical Properties of Bearing Inner Ring
Authors: Qi Mei Li , Zhao Xiu Juan , Wang Yan Tao , Liu Peng Tao
Published: January 2014

This article selects GCr18Mo steel to make an inner ring of rolling bearing. After isothermal quenching heat treatment, microstructure and mechanical properties are tested. The results show that microstructure and hardness from the surface to the core is uniform. The compositions are lower bainite and carbide, and both of them are small. The length-width ratio of lower bainite needle is about 10, and the average diameter of carbide in is 0.33μm. The hardness ranges from the surface to the core is between 715 HV and 755 HV, the average hardness of the inside and outside surface is 59.9HRC. Stress state of the surface is compressive stress and axial compressive stress is greater than the one of the hoop. Compressive stress in axial direction is about 588MPa, which is about 390MPa in the direction of the ring. After polishing, compressive stress in axial direction is about 483MPa, which is about 231MPa in the direction of the ring.
Design and Singularity Analysis for Nine-Bar Mechanism of Three Crank Hybrid Driven
Authors: Song Sheng Tao , Li Rui Qin , Gao Yan , Li Da Hai
Published: January 2014

With two degrees of freedom five-bar linkage as the foundation, carry on the multiple loop coupling, built three crank controllable nine bar mechanism similar to that of the crank slider pressing, which can meet the controlled flexible output, and conform to the mechanical properties of crank slider pressing mechanism. We use the loop analysis method to analyze the singularity of the mechanism. Analysis through two steps, first of all analysis on three crank existence conditions and the entire organization singularity, it is concluded that the condition of mechanism dont have singularity, and according to the singular condition carrying on research of singularity position, the long rod assembly condition is obtained.
An Optimal Design of Scrub Radius for Automobile Suspension Based on Adams Simulate
Authors: Li Zhan Yu , Dong Zhu Rong , Liang Song Feng , Han Cheng Wei
Published: January 2014

A four in-wheel-motor drive electric vehicle has four independent steering and independent suspension.This paper is to present a novel design of an independent suspension to reduce the uneven tire wear caused by scrub radius based on those independent suspension . Build a virtual model of the novel suspension in ADAMS and simulate. Verify the method by simulate
Influence Analysis of Machine Tool’s Turntable Angle Errors to the Roundness of Machined Hole
Authors: Cheng Qiang , Zhao Hong Wei , Cai Li Gang , Gu Pei Hua
Published: January 2014

Machining accuracy has always been a key problem to machine tool. Machine errors are caused by a variety of error factors among which the geometric error is a key element. An accuracy model of the 3-axis CNC machine tool is established in this paper with multi-body system (MBS).And based on the accuracy model, the mathematical model of roundness error also built up. At last, the influence of CNC machine tools turntable angle error to roundness error of machined hole is analyzed.
The Bottle Opener Stamping Mold Design
Authors: Wang Zhen
Published: January 2014

This article ameliorated the process of the bottle opener. It determined the molds kind and structure. And the major components of the molds key points in the design were introduced in detail. At last it can improve the productivity and low the cost.Then some corresponding process method for the same Stamping parts were proposed.
The Kinematics Simulation Analysis of a Spike-Picking Roller for a New Self-Propelled Maize Harvester Based on ADAMS
Authors: Ming Zhe
Published: January 2014

This paper presents a maize stalk model established with the discrete beam method through UG to create the crop spike-picking roller model with a kinematics simulation analysis based on ADAMS. This method systemizes the parameter design of spike-picking roller divider with a necessary 3D model for the actual needs. It shortens the development cycle and provides certain theoretical basis for the development of the new self-propelled maize harvester.
Study on Valve Train Analysis for One-Cylinder Vertical Engine
Authors: Wang Jing , Wang Yong , Liao Ying Hua
Published: January 2014

In this paper, valve train has been designed and analyzed to meet the requirements of the specified valve lift profiles, mechanical stresses and engine packaging. Valve train dynamic analysis has been used to confirm satisfactory dynamic response.
Biaxial Stretching Technology and its Development
Authors: Xin Yue Fei , Xin Hong Bing , Xue Zi Yun , Li Quan Lai , Cui Deng Qi , Liu Long , Wang Tan
Published: January 2014

In this paper, the development process of BOPF technology was described, the tubular film stretching method and planar biaxial stretching method were compared, several types of one-step biaxial stretching equipment were introduced, and the prospect of the development of biaxial stretching was given.
Comparative Analysis of Hydraulic Energy-Dissipation Damper Performance Based on AMESim
Authors: Zhang Min , Wang Hong Kun , Qian Xue Song
Published: January 2014

This paper mainly introduces three types of hydraulic energy-dissipation dampers, which adopts the damping hole, relief valve, and relief throttle valve, and the structures, operation principles and energy dissipation mechanisms in detail. Using AMESim to analyze the performance parameters comparatively, it can be concluded that the hydraulic damper adopting relief valve has strong capability of energy consumption and effectively ensures the safety of engineering structures.
Application of π Equivalent Circuit in Mathematic Modeling and Simulation of Gas Pipeline
Authors: Wang Jun Ru , Wang Tao , Wang Jun Zheng
Published: January 2014

To simplify the analytic process of the conventional modeling method, an equivalent circuit is constructed to simulate the dynamic analysis of pressurized gas pipeline system. The several π equivalent circuit models are built for a section of gas pressurized pipeline. The transfer function and scheme for the realization of the simulation model are given in detail. Based on the simulation of frequency responses for the π equivalent circuit models and the exact model, it is shown that the π equivalent circuit model is of high simulating accuracy.
Research on Fault Diagnosis Method of Steam Turbine Unit Based on the Theory of Super Ball
Authors: Deng Xiao Wen , Han Yan Peng , Wang Cheng Cheng , Gu Yu Jiong
Published: January 2014

A fault diagnosis method of steam turbine based on the theory of super ball is proposed, which combines density clustering with hierarchical clustering. The correlation of vibration and thermal parameters is introduced as the clustering factors. The efficiency of diagnosis,the sensitivity of noise and the accuracy of diagnosis are improved. Experiments show that the method and the selection of clustering factor are feasible.
Application of IR-Spectroscopy for Study of Alumosilicate Raw Materials
Authors: Lebedev Mikhail Sergeevich , Zhernovsky Igor Vladimirovich , Strokova Valeria Valerievna , Fomina Ekaterina Viktorovna , Kozhukhova Natalia Ivanovna
Published: January 2014

IR-spectroscopy is an essential tool for the study of the structural features of the material, regardless of its state (amorphous or crystalline). It allows accurately explain the type and character of structural bonds, the presence of certain molecular groups in the material. For the construction material science, this analytic method helps to study raw materials and composite materials, binders, etc.
Analysis of Vibration Characteristics for Wind Turbine Gearbox
Authors: Shen Gang , Xiang Dong , Mou Peng , Jiang Jing Min , Gao Lang
Published: January 2014

Wind turbine is the high-end and important equipment, of which the reliability and stability is always one of the main problems. Because the gearbox is running under the condition of dynamic load caused by random wind speed, it has important significance for improving reliability of the transmission system to research dynamic behaviors of wind turbine gearbox, especially the vibration characteristics. First of all, time-varying stiffness of the meshing gear-pair is calculated in this article. Then the dynamic model of parallel gears is established and the corresponding vibration characteristics are simulated. Finally, the conclusion that the speed increasing gearbox has the amplified effect on vibration displacement disturbance and the speed decreasing gearbox has the diminished effect on vibration displacement disturbance is drawn from the contrastive analysis of vibration characteristics for these two gearboxes.
Study on the Flexural Behavior of BFRP-Plate Strengthened Beams
Authors: Lv Qing Fang , Qin Ji Hong , Zhu Ran
Published: January 2014

Flexural behavior of BFRP composite bamboo beams is tested with taking the size effect and number of BFRP-plate layers into consideration. The results illustrate that the BFRP-plates enhance the stiffness and ductility of bamboo beam, proving that BFRP plates undertake a portion of tension in the tensile region. With layers of BFRP plates increasing, the enhancing effects more significant. However, strengthening effects decline with the aspect ratio of bamboo beam.
Bond Behavior of Aluminum Laminates in NSM Technique
Authors: Zhu Ji Hua , Zhu Miao Chang , Wei Liang Liang , Li Wei Wen , Xing Feng
Published: January 2014

An attempt was made to replace the commonly used Fiber Reinforced Polymer (FRP) with aluminium alloy in NSM technique. This paper presents experimental investigation of interfacial bond behavior between NSM aluminium laminates and concrete structures. Aluminum laminates were mounted into premade slit of concrete with epoxy resin. Test results show that both maximum applied force and ductility of NSM reinforced specimens can be effectively improved by increasing bond length and width of aluminium laminates, whilst almost no change was found in average bond strength at the same time. Besides, the loaded end slip of specimen, corresponding to the maximum applied force, was mutually influenced by bond length and width of aluminium laminates. Furthermore, the measured strain distribution of aluminium laminates along the direction of bond length of specimen was found to be similar to that of FRP in NSM technique.
Research on Parameters of RC Structure Reliability
Authors: Cai Bin , Liu Xin Hui
Published: January 2014

In the analysis of engineering structures are usually adopt the method of fixed value, that is the practical engineering structure under load and the performance of materials used by structure shall be treated as a constant value.But, in fact, the structure of geometry size, bear the load, material parameters,computing model and so on are affected by various factors. In order to more accurately reflect the reliability problems of reinforced concrete structures, this paper, the factors above will be regarded as random variables, combining the basic theory of reliability design, through the probability analysis, in normal uselimit state reliability of reinforced concrete structures for example analysis of the influence of related parameters on the structural reliability.
Finite Element Analysis of the Surface Settlement Induced by the Shield Tunnel Construction
Authors: Gao Ling Xia , Yang Xiang Jun , Qin Li Kun
Published: January 2014

Three-dimensional non-linearity finite element model of shield tunnel was established on basis of the Z1 line of Tianjin subway. And then it was applied to simulate construction process of shield tunnel. Surface settlement of the tunnel during the construction was obtained. The settlement data of transverse and longitudinal direction from numerical simulation were fitted through a polynomial expression. Then a contrastive analysis of curves from numerical simulation and matching formulae were made. The result shows that it is feasible to utilize the empirical formulas like Pecks to predict surface settlement in Tianjin caused by shield construction.
Seismic Behavior Analysis of a Long-Span PC Composite Box-Girder Bridge with Corrugated Steel Webs
Authors: Wang Qiao , Wan Shui , Li Pei Feng
Published: January 2014

Based on a long-span PC composite box-girder bridge with corrugated steel webs, the dynamic characteristics and seismic behavior of finite element model built by Midas Civil is analyzed through response spectrum method. The results show that the first natural frequency is vibration of inner surface mainly for the main span and it meets the demand of two-stage seismic design.
Repairing and Reinforcement of Bridge Structure
Authors: Han Xiao , Li Yan Bin
Published: January 2014

In order to make the damaged bridges continue to play a role in a short period of time, ensure the normal order of the bridge structure is used,and ensure the traffic safety, we carried out the bridge reinforcement and repair work. On the basis of the actual testing data in combination with the practical situation of engineering and the damage degree, we damaged parts of the bridge of grouting reinforcement, embedded, anti-corrosion treatment, eliminate the hidden trouble of the structures, to guarantee the normal operation of city traffic. This article mainly introduces the harm of main girder section and the reinforced repair way.
Development of Techniques for the Construction of PC Composite Box-Girder Bridge with Corrugated Steel Webs
Authors: Shen Kong Jian , Li Pei Feng , Wang Qiao , Wan Shui
Published: January 2014

This paper presents a survey of construction techniques for pre-stressed concrete (PC) box-girder bridge with corrugated steel webs in recent decades. The structural forms of the bridge have experienced simply supported beam bridge, continuous girder bridge, cable-stayed bridge and the continuous rigid frame bridge. Meanwhile, the construction technologies were constantly innovated, including cast-in-situ, precast and the combination of them. The processing and installation technologies of corrugated steel webs and several typical construction techniques for PC box-girder with corrugated steel webs were elaborated, such as full framing construction, cantilever construction, span-by-span construction, incremental launching construction and some other various innovative ways. The valuable experiences in a variety of construction methods were summed up. The results show that some innovative construction ways should be developed by fully utilizing the corrugated steel webs as a guide beam or a work platform to improve the efficiency of construction.
Study on the Static and Dynamic Load Test of Nicky Bridge
Authors: Wang Dan Ni , Wang Lei , Li Ming , Sun Yue Long
Published: January 2014

In order to understand the actual working condition and the bearing capacity of the bridge, the static and dynamic tests were carried out. By measuring the stress-strain and deformation of the main control sections of the bridge, we can determine if the design expectations of the structure and its actual working performance were consistent. Through dynamic load test motivating the bridge, we got the dynamic structure factor and vibration characteristics.
The Experimental and Theoretical Research on Creep Effect of Large Prestressed Concrete Box Girder
Authors: Yang Ji Xin , Liu Pei , Yang Ming Chao
Published: January 2014

The concrete creep effect is a peculiar phenomenon of concrete material, it has a significant effect on the deformation and internal force redistribution of concrete member, besides, it may cause the loss of prestress , it may have serious consequences especially on complex structure such as long-span bridges. So it must be considered in bridge design and construction. Based on the subject of CYSG deformation monitoring and 32m precast PC simply supported box girder, the method of creep test has been researched and determined in this paper firstly, then the laws of the development of the creep has been summarized, and the influencing factors of concrete creep has been concluded. Using the finite element software ANSYS and the APDL language, theoretical analysis of creep has been carried on in this paper. In conclusion, This paper analyzed the influencing factors of concrete creep and provided the basis for long-term deformation control of creep by comparing the theoretical results with the experimental data.
Evolution Characteristics of Existing Bridge Safety Based on Algebraic Topology and Image Processing
Authors: Han Ji Guang , Xu Jian Xin , Xu Ze Min
Published: January 2014

This paper investigates the evolution characteristics of existing bridge safety based on algebraic topology and image analysis. Through the calculation of betti numbers of cross section in bridge pier binarization images, evolution curve of betti numbers time series is observed, which reflects the changes in internal structure of bridge piers, due to the variation of external environment. The analysis results show that when the evolution trend of the betti number appears a smooth change, the bridge pier is in safe condition, and when betti number curve appears sudden fluctuations, the internal structure of piers presents some changes. This study has positive significance for long-term monitoring of bridge safety.
Static Deformational Behaviors of Cable-Stayed Suspension Bridge and its Simplified Material Cost Model
Authors: Zhang Fei Jin , Nie Li Li , Cao Hong You
Published: January 2014

Cable-stayed suspension bridge is an unconventional bridge type with a bridge typology based on the combination of both cable-stayed and suspension systems. In this paper, the static behaviors of cable-stayed suspension bridge were revealed from the viewpoint of the structural deformational characteristics under different kinds of live loads. To more clearly illustrate these characteristics, the simplified analytical method based on the simplified analytical solutions for cable-stayed bridges and suspension bridges were adopted in the derivations. Furthermore, the simplified material cost model based on allowable stress method for cable-stayed suspension bridge was also proposed for researchers and designers to adopt in preliminary design stage.
Geometry Control of The Steel Box Girder of Jiashao Bridge at The Fabrication Stage
Authors: Jia Shao Min , Zhao Lei , Gu Xiang
Published: January 2014

The fabrication precision of steel box girder segments is critical to ensure the erection of girder segments is smooth. Taken Jiashao bridge as the research subject, based on geometry control theory, control elements of a steel box girder and control method were introduced, and measured data in the fabrication control of Jiashao bridge girder was given. Control practice shows the erection of the girder is smooth due to the precise control of steel box girder segments at the fabrication stage, and the profile of main girder at completion stage can achieve smoothly the design profile.
Procedure Inversion Effect Analysis of Final System Transformation of Prestressed Concrete Continuous Girder Bridge
Authors: Luo Xu , Cai Lu Rong
Published: January 2014

When the cantilever construction is adopted by the prestressed concrete continuous girder bridge, the order of two key procedures between removing temporary support and tensing remanent prestressed cable is used to be ignored. In order to study the influence of procedure inversion, the influences on bridge shape, stress distribution and prestressing loss were calculated for one common prestressed continuous concrete box girder bridge by MIDAS CIVIL 2006, respectively. The obtained result presents that: the influence on the bridge shape and the prestressing loss are not apparent, but the influence on the stress distribution is serious; the maximal compressive stress of procedure inversion is more 42.3% than common construction procedure only by tensing the remaining steel beams at box girder; especially, the combining area between the box girder and temporary support is easy to pull out. So, the procedure inversion construction method cant be accepted.
Optimization of Prestress Reinforcement Design in Large-Span Prestressed Concrete Continuous Rigid Frame Bridges
Authors: Guo Wen Jie , Wu Li Jie , Niu Yong Zhe , Tian Ning
Published: January 2014

As the span became longer and the accumulation of service period of bridges, the problem that deflection of main span has also clearly emerged. To reduce long term deflection of large-span prestressed concrete continuous rigid frame bridges, tendon group-additional bending moment influence matrix method is proposed to optimize the design of prestressed reinforcement. Based on elasticity assumption, an optimum prestressed tendon arrangement can be derived by least square method. The new design is tested to be effective considering shrink and creep effect which fulfills the practical application.
The Plate Body Stabilization Technology of Soft Soil Subgrade in Caofeidian Area
Authors: Li Dong Guo , Chen Jian Ping , Zhang Yong Qiang
Published: January 2014

The applicability of the plate body stabilization technology was determined basing on the different treatment methods on soft foundation in Caofeidian areas. It discussed the construction technology and the main points of construction furtherly on the plate body stabilization technology. The soft foundation bearing capacity reached 200kpa and the settlement amount was less than 16mm through static load test after dealing with the soft foundation. The results meet the specifications and project requirements.
The Application of Fuzzy Mathematic in Earthquake Damage about Ancient Buildings
Authors: Wang Feng Hua , Huang Xiang Yun , Wang Wei Ming
Published: January 2014

Ancient buildings have poor anti-seismic ability due to the long age of construction and lack of data materials. This paper seeks a scientific and quantitative evaluation method and predicts the earthquake damage of an ancient building by using fuzzy analogy approach. The example shows that this evaluation method has great meaningful of the existing ancient buildings under the earthquake intensity which likely to be encountered with the design life expectancy and provides a certain scientific basis of seismic estimation in ancient buildings.
The Deformation Features of Crustal Structure Beneath the East Tibetan Margin and Neighboring Areas
Authors: Sun Chang Qing
Published: January 2014

Shear wave splitting analysis is one of the most commonly used techniques in structural seismology. In this study, the splitting parameters of Moho converted P-to-S phase (Pms), the time difference between maximal energy of qS1 and qS2 and their amplitude ratio were obtained. The data were from 29 broad-band stations across the Longmenshan fault belt. Subsequently, the deformation features of the crustal structure beneath the east Tibetan margin and Sichuan basin were analyzed. Our results show that the time delay and the time difference between maximal energy of qS1 and qS2 in east Tibetan margin is obviously larger than Sichuan basin. However, the amplitude ratio between qS1 and qS2 beneath Longmenshan fault is much smaller than other tectonic sub-regions. These results may suggest the existence of fluid beneath the Longmenshan fault.
Research of Indoor Reduced Scale Model Test for Negative Friction of Pile Group
Authors: Chen Chang Liu , Liu Yan , Ye Shuai Hua , Wei Song Qi
Published: January 2014

The target of this paper is to research the change law of the negative friction for after soaking. The negative friction of pile group is measured through the indoor reduced scale model test in loess area. The similarity ratio design, the groove design of the model, the selection of test materials, the design of the ground soil, the layout of measuring point and the research of load method are involved in this test. Through the study on the reduced scale model, it will have a deeper understanding to the mechanism of pile side negative frictional resistance.It also can guide the design and practice of other engineering.
Study on Seismic Behavior of Double Web-Angle and Top-Seat-Angle Beam-to-Column Connections
Authors: Liu Jian , Zhou Guang En , Peng Deng Feng
Published: January 2014

In order to study seismic behavior of double web-angle and top-seat-Angle connections, finite element methods, which included material, geometric and contact nonlinearity, were used to the model under cyclic loading. The effects of the angle length, the angle thickness, the bolt diameter and grade on strength, and the gauge distance from the edge of the angle to the center of bolt line on strength and hysteretic behavior of connections were studied. Finite element results reveal that the hysteretic behavior, initial stiffness and load bearing capacity are significantly affected by the gauge distance from the edge of the angle to the center of bolt line, the angle length, the angle thickness and the bolt diameter and grade.
Seismic Retrofit of a Typical School Building Using Column Jacketing and Supplement Beams
Authors: Huang Chao Hsum , Chang Wei , Liu Shih Hua
Published: January 2014

To ensure the safety of students during earthquakes, the Department of Education in Taiwan has been conducting a seismic evaluation and rehabilitation project on elementary and high-school buildings in recent years. In this project, column-jacketing is one of the most frequently used retrofit techniques due to its compatibility with existing building configurations. However, the seismic performance of column-jacketing often falls behind other retrofit techniques such as addition of shear walls. In order to enhance the seismic performance of column-jacketing, the addition of supplemental beams is proposed in this study. Analysis conducted on a typical school building based on nonlinear push-over analysis indicates that such addition could improve the seismic performance of column-jacketing for 38%, which would provide a great enhancement on the seismic safety of the retrofitted building.
Multi-Scale Elastoplastic Dynamic Analysis of Steel Frame Welded Connections under Strong Earthquake Excitation
Authors: Zhao Er Nian , Qu Wei Lian
Published: January 2014

Multi-scale elastoplastic dynamic analysis of the welded connections is conducted under the strong earthquake excitation based on a steel frame engineering case. Two types of multi-scale model are built for the contrastive analysis, and the plastic deformation of the connection section is extracted to investigate the application of the plane-section assumption. The results indicate that elastic-plastic status makes the column and beam sections not meet the flat section assumption. Finally, the determination method of the refined modeling zone is studied based on the application of the plane-section assumption.
Research of Design and Construction Key Technology of Underwater Tunnel Interchange Segment
Authors: Zhang Xian Feng
Published: January 2014

By Changsha Xiangjiang River Camp Road tunnel geological conditions and the overall analysis, the paper proposed the overall and the inner contour design of the underwater tunnel interchange segment .Establishing calculation model of the north-south main line and C, D segments interchange ramp, and using ANSYS finite element software to calculate and determine the design parameters of the tunnel cross-section . For the upper and lower layers tunnel use excavation construction, and applying the Center-Cross-Diaphragm (CRD) method to tunneling.
Research of Xiangjiang Camp Road Underwater Tunnel Minimum Cover Thickness
Authors: Zhang Xian Feng
Published: January 2014

The minimum rock cover thickness is the most important design parameters affecting cost and safety of the tunnel. Designing underwater tunnel need think project cost and risk and other factors to determine a reasonable minimum tunnel cover thickness. Under the actual conditions of Xiangjiang River Camp Road Tunnel, according to the current domestic and foreign common method for determining the minimum depth of underwater tunnel will not be able to meet the conditions surrounding the wiring, and it is difficult to play tunnels traffic relief function, while based on the Perform thorough research and theoretical analysis, putting forward the underwater tunnel determination method which is based on the engineering control measures.