bluuebunny/crossref_metadata_2025 huggingface dataset:
Simulation of Frictional Thermal Effect during Blade-to-Case Full Annular Rub
Authors: Wang L.L. , Li Shun Ming , Tian G.C. , Li Ji Yong
Published: March 2015

During blade-to-case full annular rub, the frictional thermal response characteristic of blade-to-case was analyzed by the finite element method. A thermal structure coupling finite element model of blade-to-case was established and the transient thermal and structural field was analyzed. The distributions of temperature field and equivalent stress field were obtained on the basis of a certain centrifugal force, friction coefficient and rotate speed of the blade. The numerical simulations have been conducted to show that the heat affected zone (HAZ) locates in a very thin layer of blade-to-case, and the thermal stress is very high in this layer. The thermal effect in the blade-to-case friction process is more obvious as the rotate speed of blade and centrifugal pressure are increased. In practice, it is suggested that the friction thermal effect in the process of rotor-stator rub-impact should not be ignored.
Design and Analysis of Flat-Top Beam Produced by Diffractive Optical Element
Authors: Nie S.Z. , Yu J. , Liu Y. , Fan Z.W.
Published: March 2015

The modified Gerchberg-Saxton (G-S) methods of diffractive optical elements are presented for converting a Gaussian beam into a flat-top beam. The sample points of the input and output planes are discussed based on the sampling principle. The relationship between weighting factor, empirical constant, diffractive efficiency, and intensity uniformity is investigated. The simulation results of different modified methods are calculated when the incident beams are the same. The results show that the intensity uniformity of the output flat-top beam is the best when using the ST modified method.
Fiber Laser Mode-Locked by Carbon Nanotubes as Saturable Absorber in Fiber End
Authors: Liu S.Y. , Li B. , Wang Z.Y. , Wang L.T.
Published: March 2015

We incorporate carbon nanotubes on the silver mirror as saturable absorber and modelock fiber laser was realized. Q-switch fiber laser are also demonstrated with fiber end merged in CNTs solution.
A Method of 3D Braided Composites Damage Monitoring
Authors: Zhang Hua , Xiao Y.C. , Li Ming , Liu G.Q. , Zhang Jie
Published: March 2015

L shaped braided composites under fatigue load was researched, using piezoelectric sensors and active Lamb wave monitoring technology. HHT transform based signal envelope obtaining method and the damage index method based on signal energy change were used to monitor the damage extending of the braided composites.
Experimental Research on Seismic Performance of PHC Pipe Piles
Authors: Li Yi Fan , Liu Ping , Zhang Jian Xin
Published: March 2015

Four prestressed high strength concrete pipe piles were tested under low cyclic loading, the failure characteristic, bearing capacity, ductility performance and hysteretic characteristic were analyzed. The research show that the bearing capacity and the ductility performance could be improved a lot by two measures of adding non-prestressed reinforcement and filling the pile core. The hysteresis loop of pile specimen adding non-prestressed steel bars is fuller, the energy dissipation capacity is larger, and the hysteretic behavior is better.
The Subway Engineering Risk Assessment Based on Fuzzy Comprehensive Evaluation
Authors: Zhang Wen Li , Wang Jian Bo , Song Mei Jia
Published: March 2015

Characteristics of the subway project is complex, concealed, lot of potential risks. Aiming these features, in order to reduce the risk of the project and improve the rationality and accuracy of subway risk assessment, the main risk factors in the subway are analyzed and identified by methods of expert investigation and checklists, and the risk index system is established, based on research of the subway construction risk mechanism. Then the membership of each evaluation factor is determined by the expert experience method, and the weight of each risk factor is determined through the method of analytic hierarchy process (AHP). Eventually, the subway engineering risk assessment model is established based on the fuzzy comprehensive evaluation method. Finally, the project example verifies the rationality of the risk assessment model.
Analysis and Control of Layer Deformation Induced by the Densely Arranged Large Diameter Underground Steel Tubes Jacking with NTR Method
Authors: Jin Chun Fu , Niu Peng , Zhao Yong Sheng , Wang Xuan
Published: March 2015

Combined with the finite element method (FEM) and the field data of Shenyang Metro NTR engineering for pipe jacking process, the variation of surface deformation and influence factors of NTR construction are systematically analyzed. The result is shown that the curves of the lateral surface subsidence produced by pipe jacking process are accord with the normal distribution curves put forward by Peck .When the top steel pipes are jacked , the surface subsidence develops rapidly and the rate of deformation is larger. In addition , grouting behind the wall and the sequence of the pipe jacking all have a greater impact on the deformation of the layer.
Numerical Simulation of Mould Plate Trolley by ABAQUS
Authors: Li Hai , Shang Wen Guo , Liu Dan Na , Wang Wei
Published: March 2015

This paper is to study the feasibility and mechanical properties of the tunnel trolley in Yangdan mountain. Analyze the internal force and deformation of the trolley and template with the ABAQUS, and the results show that the internal force of the model is much less than yield stress. Therefore, the structure is very safe.
A Simplified Formula to Calculate the Initial Value of Iteration for Contracted Depth in Quadratic Parabola Shaped Channels
Authors: Wen Hui , Li Feng Ling
Published: March 2015

At present, the complexity of calculation process and expression form of the initial value of iteration for contracted depth in quadratic parabola shaped channels,Seek a new iterative initial value formula for contracted depth in quadratic parabola shaped channels. Through an identical deformation on the basic equation for contracted depth in quadratic parabola shaped channels. Deduce the iterative formula for computing the quadratic parabola section contraction water depth. Introduction the dimensionless contraction water depth concept, plot the dimensionless contraction water depth and the dimensionless parameter relationship curves. Determine the iterative formula of initial value form for quadratic parabolic shaped channels, and based on the theory of optimum fitting, by the minimum residual standard differential and simple form of formula as the goal, the initial iteration value formula for calculation contracted depth in quadratic parabola shaped channels was obtained. It is greatly accelerating the convergence rate iterative calculations. The calculation of a practical case and error analysis of the depth calculations show that in the utility range of , its maximum relative error is less than 0.26% after performing one iteration. This formula has definite physics concept, easy calculation, high precision and wide range compared with the existing formulas. It will bring great convenience for designers.
A Study of Equivalent Manhole in Streets-Sewers of Urban District Instead of Roadside Water Exchange by the SWMM Model
Authors: Cheng Kuei Hsiang , Lin Chih Hsien , Chao Cheng , Cheng Ping Chung , Chen Ying Wen
Published: March 2015

The important flooding drainage phenomenon of the urban regions includes of ground water exchange, sewer water exchange and ground-sewer water exchange. Due to the spread of urban regions development with high economics activities, the distributions and specifications of ditch in urban regions are irregular and un-uniform, equivalent Manhole would be used instead of ditch water exchange and its mechanism to fill ground water and sewer water exchange mode evaluated for urban flooding mode in this study. Sewer’s catchment of Ming-Seng S. Rd 608 Street in Chiayi City as case study applied by SWMM model showing urban flooding phenomenon and the effective drainage mechanism during rainfall similar Typhoon Morakot, thus, providing reliable information and references for engineers.
A Study on the Evolution of Distributary Channels in River-Dominated Deltas Using Numerical Simulations of Hydrodynamic Behaviors
Authors: Wang Yang Jun , Yin Tai Ju , Deng Zhi Hao
Published: March 2015

The Fluvial-dominated delta is one of the extremely important deposition systems in oil and gas exploration. In this paper, the three-dimensional numerical simulation of hydrodynamics has been applied to the precise analysis of the formation of fluvial-dominated deltas and the evolution of their distributary channels. The model has been created using the Delft3D program, and the conditions of the numerical model have been set according to the hydrodynamic characteristics of modern rivers and deltas. The calculation field was 20.5 km in length by 10 km in width. With the Mor-Factor set to 60, the simulation time was 45 days. The formation and the avulsion of the mouth bar, as well as the extension, migration and bifurcation of distributary channels, have been observed and studied through analysis of the simulation results. The vertical cross-section shows that the distributary channel was filled multiple times. According to distributary channel evolution characteristics combined with quantitative methods, the terminal distributary channels can be extremely developed under ideal conditions. Due to the cross-cutting and reform effort of distributary channels, sediments were spread widely and continuously. The results show that the numerical model works well in explaining the process of evolution in fluvial-dominated delta distributary channels. This study not only enables us to quantitatively understand the dynamic processes of terminal distributary channels in fluvial-dominated delta systems, but also provides a reference model for numerical simulation of hydrodynamics in sedimentology study.
Based on Numerical Simulation of the Water Conservancy Hub Two-Way Flow under the Condition of Lock Approach Guide Wall Type Optimization Research
Authors: Yang Xiao Li , Wu Kai , Fang Wen Chao , Wu Long Hua , Li Meng Di , Yue Lei , Zhang Qin Jie
Published: March 2015

Navigation task of water conservancy when the over-current buildings are in runtime often affect the flow regime lock approach, endangers the ship navigation safety. In engineering we often set up guide wall protection approaches between approaches and flow buildings. By means of numerical simulation, the guide wall shape optimization study, and combining with the engineering practice, this paper proposes a microbend flood guide wall of new type. The results show that this new type of guide wall can in a variety of flow circumstances change such flow structure, reduce the horizontal speed of the approaches, is a simple and effective engineering measures.
Development of One Dimensional Numerical Model on Large Water Diversion System
Authors: Zhang Cheng , Zha Lin
Published: March 2015

A one-dimensional numerical model was developed for unsteady-flow in a large-scale conveyance channel with complex inner boundary conditions. Using Taylor expansion and finite difference method, this model incorporated three types of inner boundary conditions, including regulators, inverted siphons, and flumes with parallel connections. It can facilitate continuous simulation with large-amplitude variations in water level and flow discharge during the flow transitions. Transition flows were simulated by this model, which were caused by the operation of a single gate of the Middle Route of the South-to-North Water Diversion Project. The discharges of simulation were consistent with the discharges of formulas calculation, and the water level variations accords with hydraulic law. The results indicate its efficiency and applicability on simulating hydraulic response of large-scale conveyance channels with complex inner boundary conditions.
Experiment Study on Sediment Control and Sediment Discharge of Lake-Type Reservoir on Sediment-Laden River
Authors: Yang Xiao Li , Fang Wen Chao , Wu Long Hua
Published: March 2015

Taking Derisubaoleng Reservoir as an example, the experiment is mainly based on physical model and numerical simulation to study the effect of sediment control and discharge of the sediment retaining weir. With the help of the reservoir terrain a sediment retaining weir is built to form a“ deputy reservoir” ,which makes the sediment passing road more narrow, As a result, the ability of sluicing sediment is stronger than before. The purpose of this paper is to search a new idea to solve sediment problem in lake-type reservoir on sediment-laden river. The study result indicates that the sediment retaining weir both can prevent sediment being deposited in north “deputy reservoir” and can enhance the ability of sediment discharge in south “main reservoir” . Thus ,the sediment retaining weir is a effective engineering measure to solve sediment problem in lake-type reservoir.
Finite Element Analysis of the Soil Pressure in Sandy Soil at the Top of Pipe Culvert
Authors: Cheng Qi Yun , Li Yong Gang
Published: March 2015

ANSYS is an engineering analysis software with a multiple analysis ability.It can be used to solve the structure, fluid, electric, electromagnetic fields and collision problems and so on.So it has been widely used in varied fields.Circular culvert is commonly used for water hydraulic structure in hydraulic engineering.The paper focuses on the study of culvert soil pressure at the top of the circle under the sand in the northern of China by using the Ansys finite element analysis software.Research shows that:When the elastic modulus and Poisson's ratio changes,the soil pressure distribution shape doesn’t obviously change;While the soil pressure and the relative height of precipitation have a certain relationship with the two indicators.
Influence Experiment for the Spacing Distance of Orifice Plates to Local Resistance Coefficient in the Pressure Delivery Pipeline
Authors: Li Lin , Jin Sheng , Bai Zhao Liang
Published: March 2015

In order to research the influence rule of the spacing distance between orifice plates to the local resistance coefficient and total local water head losses , carried out the experiment research through set the two different relative distance of orifice plates in the pressure delivery pipeline. The experimental results showed that: When the relative distance, the results of total local water head losses calculated by the traditional hydraulics formula with the real measured data, the maximal relative error was less than 3%. This shown that when the relative distance was big, it was no necessary to consider the influence of the relative distance between orifice plates. However, when the relative distance, the real measured data of the total local water losses was much smaller than the calculated data by the traditional calculation formula, the maximal relative error was reached 239.5%. It was explained that when the relative distance was relative small, existed the adjoining influence between orifice plates, so the total local water losses by the multi-orifice plates was not equal to the sum of each water head loss by the single orifice plate, and the total local head loss was not necessarily increased with the number of orifice plates increasing. Whether or not the increasing total local water head losses was closely related with the relative distance of the orifice plates. The traditional local water head loss calculation formula in the hydraulics should be corrected and modified.
Numerical Simulation of Water Flow in Mine Waste Rock Pile
Authors: Zhang Meng Zhou , Xu Zeng He , Jiang Li Guo
Published: March 2015

As a long-term source of contaminant solutes, the flow of water within a waste rock pile containing reactive sulfide minerals significantly contributes to the solutes transportation. In this paper, a waste rock pile with the internal structures and grain size distribution from a typical waste dump is introduced as the geometric configuration. A numerical model is then applied to simulate unsaturated flow within a waste rock pile constructed with two primary materials. The simulations results show that the water movement within heterogeneous pile mainly depended on the internal structures. The flow of water can be controlled by the fine material layers within the coarse materials. These fine material layers form a capillary barrier which preventing the water infiltrate towards the centre of the pile. They can retain more water than coarse materials and form a ponding effect and/or percolation points within the pile.
Purification of Micro Polluted Surface Water and Study on Membrane Fouling by PAC-UF Process
Authors: Wang Peng , Bi Dong Su , Bai Hao , Zhang Yong
Published: March 2015

This paper study on PAC-UF process for treatment of micro surface polluted water, found that PAC-UF process can effectively remove 83% CODcr, 55% NH3-N and 81% UV254, it shown that PAC-UF process had good treatment effect to micro surface polluted water, thus adding PAC can improve the treatment effect and alleviate membrane fouling. The material and influence of hydrophobic were analyzed and found that PVDF membrane had better performance.
Review on Pedotransfer Functions for Predicting Unsaturated Hydraulic Conductivity
Authors: Wang Ming Xing , Chang Bao , Wang Da Ke , Zhang Wei Hua
Published: March 2015

The soil pedotransfer functions (PTFs) provide an easily way to estimate the unsaturated hydraulic conductivity, and it predicts missing characteristics from already available basic soil data. In this paper, a review was made on the most common PTFs for the estimation of unsaturated hydraulic conductivity in recent years, including the methods of Rosetta, Rawls, Campbell and Vauclin. Based on the methods, a summary of necessary input parameters and basic properties of the PTFs was made to in this paper. Finally it was pointed out that the future study will focus on how to improve the accuracy and reliability of PTFs and the multi scale study.
Experimental Study on Seismic Behavior of Masonry Walls with Window Openings Strengthened with Sprayed GFRP
Authors: Sun Cheng Fang , Chen Chun Ming , Gu Qian
Published: March 2015

A contrast investigation of the seismic behavior of unreinforced masonry walls with window openings strengthened with Carbon Fibre Reinforced Polymer (CFRP) sheets and sprayed Glass Fibre Reinforced Polymer (GFRP) is presented. Three wall specimens in the scale of 1/2 were tested by the horizontal cyclic loading combined with constant gravity loads. The seismic strengthening effects by two different FRP retrofitting schemes are compared in aspect of the hysteresis response, deterioration of rigidity and ability of energy dissipation. The experimental results indicate that the increasing degree of the improvement of seismic behavior of the SGFRP-strengthened wall are significantly superior to that of the wall strengthened with epoxy-based CFRP; and the overcoat of sprayed GFRP can bond tightly and work well together with the masonry to play a critical role in earthquake resistance.
Study on Non-Equilibrium Evaluation Model of Water Resources Development and Utilization
Authors: Chen Ying Qin
Published: March 2015

According to the area of water resources development and utilization of non-equilibrium phenomena, introduces the concept of water resource Gini coefficient, introduces two kinds of calculation methods of water resources in the Gini coefficient, establishes a non-equilibrium evaluation model of water resources, from the two aspects of intragenerational and intergenerational were evaluated for non-equilibrium degree and the law of development and evolvement of water resources development and utilization in the area, and to put forward the idea of water resources and social economy unbalanced development model. Through an empirical analysis of water resources Gini coefficient in Hubei province, obtained the practical achievement and conclusion.
The Effects of Saturated Sediment Layer on Seismic Wave Motion of Gravity Dams
Authors: He Xiang Li , Jiang Yu Tong , Ye Mao
Published: March 2015

Sediment layer can change the dynamic property of reservoir water. As a result, the dynamic response of dam body would be affected. In this paper, the sediment layer is simulated as saturated liquid-solid two-phase media, and the finite element model of gravity dam-reservoir water-sediment system is established with the gradual enlargement mesh method. Then the influence of sediment layer on seismic wave motion is studied with this model. The calculation result shows that the energy radiation of far field of foundation, reservoir water and sediment can be considered efficiently in this model, and with the thickening of sediment layer the dynamic water pressure on dam face decreases.
The Application of Distributed Temperature Sensor in Super-High Arch Dams
Authors: Zhou Jian Fu , Zhou Yi Hong , Zhao Chun Ju
Published: March 2015

The paper introduces the distributed temperature sensor (DTS), analyzes the system veracity and the concrete temperature change compared with the conventional thermometer, shows that DTS can fast and accurately monitor the temperature of the dam and provide messages for the construction. It has great value in engineering application.
Soil-Pile Coupling Analysis of Steel Sheet Pile Bulkhead under Horizontal Loads
Authors: Wang Hong , Liu Peng , Liu Xiang , Duan Jin Gang
Published: March 2015

With the development of steel sheet pile bulkhead gradually toward large-scale and deep water, natural conditions become worse and structural load rating continues to improve, design and construction of steel sheet pile bulkhead needs higher requirements. Then the stability of sheet pile bulkhead under horizontal loads becomes particularly prominent. This paper presents the displacement and stress of steel sheet pile bulkhead structure under different horizontal loads using ANSYS, which provide academic support for the design and construction of steel sheet pile bulkhead.
Study on the Siltation in the Intake of Nuclear Power Plant Using Longterm Water Depth Monitoring and Coupled Modeling
Authors: Shin Bum Shick , Kim Kyu Han
Published: March 2015

Scarce natural resources make it imperative for Korea to exploit nuclear power plant technology to supply energy for industrial purposes not to mention for everyday usage. Korea’s nuclear power plant started when Gori Nuclear Plant started its operation in 1978 and as of today, there are 4 nuclear plants nationwide including the Gori Nuclear Plant, making up 38.2% of all of Korea’s energy supply. Since ‘waste heat’ is generated as a result of plant operation, sea water is needed for cooling purposes and therefore plants are situated near coastal areas. However, the effect on the coastal area such as erosion, deposition, and siltation from the construction of the plant itself is subject of continuing controversy and another being the effects on the coastal environment from warm water that is produced after the cooling process. Generally, topographic change is maintained in equilibrium by the tidal currents’ reciprocating motion in the coastal areas where there are dominant tidal currents. However, artificial action on the current flow for operating a nuclear plant operation at the intake and the outlet breaks the equilibrium of the tides and this in the end results in disturbing the equilibrium condition of bottom topography. This research used the results of long term investigation data of water depth and data of flow discharge conducted inside the intake to investigate erosion and the change in siltation at the intake of the nuclear power plant. After having analyzed the changes in water depth of the intake area, the results confirmed that there are 100~140cm/year and 80~300 cm/year of excess siltation at the middle area and both sides, respectively. After artificial dredging which is conducted every two years, siltation had proceeded at a substantial pace, and after some time, the pace has slowed down to its normal rate, going towards equilibrium condition. This research used the siltation pace change acquired from monitoring results to formulate coupled model in order to predict the change of water depth which will take place due to artificial construction of the intake in the future more precisely.
Study on Chloride Diffusion Parameters of Concrete Based on the Field Investigation of Harbor Engineering in South China
Authors: Fan Zhi Hong , Su Da Gen , Wang Sheng Nian
Published: March 2015

Based on the durability investigation on marine concrete structures in South China, the surface chloride concentration and the critical chloride concentration inducing reinforcement corrosion were researched. The surface concentration under the marine environment in South China was analyzed by solid core tests on the harbors with different service ages, and the fluctuation range of surface concentration ranges from 0.2% to 1.1%. Through electrochemical testing and appearance investigation, the value of the critical chloride concentration in concrete components is studied, which is in the range of 0.0518% to 0.0824% by mass of concrete.
Research on Resistance to Moisture Damage of Warm Mix Rubber Asphalt Mixture
Authors: Yang Guo Liang , Meng Fan Bing , Huang Li Pu , Wu Shi Jie , Chen Wei Peng , Ma Zhan Long , Ling Yun Feng
Published: March 2015

To verify the resistance to moisture damage of warm mix rubber asphalt mixture, the splitting strength test of warm mix rubber asphalt mixture (WMRAC-13) was conducted under different immersion time and immersion temperature. Test results show that freeze-thaw splitting strength of warm mix rubber asphalt mixture meets the requirement of moisture stability. The immersion splitting strengths in 60°C and 4°C decline with the extension of immersion time. The immersion splitting strengths in 60°C decline faster than those in 4°C. The best fitting function of immersion splitting strengths with immersion time obeys second-order polynomial and power function respectively, and their correlations are the best. The inflection point of attenuation curves is 3th day and 20th day respectively.
A Rail Abrasion Detection System Based on Image Processing
Authors: Shen Ji Jun , Liu Zheng Jun , Wu Tong , Lv Meng
Published: March 2015

Quality of steel rail affects directly the running state of locomotive. According to detection problem of rail head’s abrasion loss, a feasibility study was done that collecting image through CCD camera. Computing models of abrasion detection were established by MATLAB soft. The key question about image location was studied using the method of edge detection and image filling. Results indicate that the image detection system could obtain the abrasion loss accurately in non-contact condition. This method could provide a reference for the development of loss prevention and new detection technology.
A Railway Alignment Optimization Method Based on Minimum Cost
Authors: Zheng Xiao Qiang , Li Wei , Liu Wei , Li Na Na
Published: March 2015

In order to automatically generate the railway Alignment, an alignment optimization method based on minimum cost is proposed. Firstly, an optimization model based on the coupling constraints of line-structure-environment is established, in which the comprehensive cost of engineering, operations, and the environment is considered as the objective function. Then based on the regular grids, the Geographic Information Data can be obtained and the comprehensive cost of the connection between two grids can be calculated. At last, the optimal connection between the grids is analyzed under the angle constraint and elevation constraint, thus the optimal alignment can be generated by the connection of grids.
Experimental Study on the Hysteretic Performance of H-Beam to Square Tubular Column Connections with Diaphragm-Through
Authors: Wan Xin , Li Chao , Liu Zhi Ming
Published: March 2015

Experimental study was performed on the hysteretic performance of H-beam to square tubular column connection with diaphragm-through. The main study parameters are the diaphragm thickness and planar dimension. The experiment shows that the bearing capacity and ductility of the connection are sufficient and the strength degradation is stable as well as the stiffness degradation. This kind of connection meets the requirements specified by current seismic design codes.
A Variable Selection for Asphalt Pavement Performance Based on RBF Neural Network
Authors: Tian Peng , Zhan Gao Feng , Nai Lei
Published: March 2015

By combining RBF neural network with MIV algorithm, the main influencing factors of asphalt mixture pavement performance will be selected. First, the MIV values will be calculated by MIV method. Selection of variables is based on the size of MIV. There are 8 variables selected form 12 variables. Then, a new RBF neural network will be found by the data which have great impact to the output result. The comparison between the two RBF simulate results will prove that the method of MIV is feasible in variable selection. By the MIV method, the simulate results of RBF will be calculated faster and more accurately.
Application of Fiber Reinforced Polymer in the Structure of Continuously Reinforced Concrete Pavement
Authors: Hu Chun Hua , Ma Xiao Zhou
Published: March 2015

Continuously Reinforced Concrete Pavement is smooth and almost needs not maintenance, which has long service life as well as a great potential application. Fiber reinforced polymer as a new type of composite materials with high strength, light weight, corrosion resistance and fatigue resistance which substitutes conventional steel rebars gives solutions to the problems caused by corrosion of reinforcement. In this paper, combined with the excellent properties of FRP rebars, FRP-CRCP is introduced in detail from structural response analysis, structure design, construction and the function of self-monitoring. Moreover, it is pointed out the problem of the design index and standard for FRP-CRCP that still needs further research.
Application of Rubber Asphalt in Chengdu 3rd Ring Rd in Traffic Engineering
Authors: Zhu Xiao Hai , Li Ya Li
Published: March 2015

This paper first discusses the composition material of rubber asphalt and its control parameters, and then analyzes the experiment test method and criterion, then analyzed the gradation mix design method. The paper finally introduces the application of construction method of rubber asphalt in Chengdu 3rd Ring Rd.
Effects of Track Elasticity on Wheel-Rail Dynamic Performance of Heavy Haul Railway
Authors: Zeng Yong
Published: March 2015

Two vehicle-track dynamics models on heavy haul railway are established in two conditions of rigid track and elastic track. And the impact of track elasticity on the wheel-rail dynamics performance was analyzed using models. The results show that the critical speed of heavy vehicles and wheel-rail dynamic indexes, such as wheel-rail lateral force and wheel-rail vertical force decreased on elastic track compared with rigid track. However, other dynamic indexes, including derailment coefficient and lateral displacement of wheelsets increased on elastic track. And the wheel-rail wear indexes are some differences on two tracks.
Hydrological Zoning System for Highway Engineering
Authors: Wang Yu Lan , Li Chao
Published: March 2015

In order to strengthen the normalization of the highway hydrology Zoning research work and improve the efficiency of Zoning, the analysis model of slope runoff intensity index was set up. The provincial highway hydrological Zoning index system was built to fully embody the relationship between highway engineering and hydrological factors. The research framework of provincial highway hydrology Zoning was established. The highway hydrology Zoning research framework and Zoning indices was taken as the guidance to divide Shandong province into 2 first-grade highway hydrological regions and 6 highway hydrological subregions which reflect the overall distribution of the highway hydrological conditions in the research region correctly. The corresponding descriptions were given to introduce the highway engineering characteristics of each partition.
Experimental Tests of Historic Bent Timber Elements Reinforced with Steel Hoop and Mortise-Tendon Joint
Authors: Li Hong Min , Qiu Hong Xing , Zhao Zhe
Published: March 2015

The paper presents the results of studies proposing to use steel hoop and mortise-tendon joint (SHMT), to reinforce beams with defects (biological corrosion, cracks) in order to restore their load-bearing capacity. The proposed solution, consisting in encapsulated or bonding steel tube outside of the damaged part, is suitable for restoration work in historic buildings. Moreover, owing to the fact that the reinforcing steel tubes are situated outside the lap joint , the possibility that the crack of reinforcing joint will reduced and the fire resistance of the element is increased. The displacement loading control method was adopted in bending test. The restoration in the load-bearing capacity of the tested beams amounted from 4.42% to over 44.52%.
Collapse Reason Analysis of a Steel Truss Building under Snow Disaster
Authors: Guo Hao Xiang , Chen Long , Yang Dan , Tang Hong Yuan
Published: March 2015

This paper analyzes the reason of a steel truss building which collapsed under a snow disaster. Firstly, the investigation and inspection in site are introduced. Secondly, based on the on site work, such as the property of the metal materials and the quality of the welding joint, the status of the structure is comprehensively determined. Thirdly, through calculation with the former results, the reason of the collapse accident is obtained. Finally, some related suggestions are proposed for the design and construction of this kind of structure.
Studies the Key-Technologies of Karamay Matrix Asphalt Used in SBS Modified Bitumen
Authors: Ou Zu Min , Li Fu Jian
Published: March 2015

This paper studied the performance of SBS modified Karamay asphalt and asphalt mixtures for the purpose of widely applies it to Xinjiang highway. The effects of the different compositions of equal density modifier on modified asphalt and the compatibility of the matrix asphalt with its modifier were investigated by adjusting the content of reclaimed rubber and SBS polymer. Experiment results indicate that modified asphalt has the best performance when the modifier particles consist of 48.6% SBS polymer, 43.2% reclaimed rubber and 8.2% adjuvant. It is shown that the applying of modifier particles can improve the performance of Karamay modified asphalt and HMA (Hot Mix Asphalt) dramatically.
The Research on Pavement Maintenance Management of Beijing-Tianjin-Tanggu Expressway
Authors: Zhang Hai Feng , Wei Lian Yu , Song Yang , Dong Wei
Published: March 2015

The Beijing-Tianjin-Tanggu expressway is the first highway which is built by using World Bank loan in china. With the influence of service life increasing and traffic growing, the diseases appear such as rut, crack and poor flatness, so the use performance of the highway obviously degrades. Pavement overhaul effectively reduces the appearing of pavement diseases and prolongs the service life of the road. This paper conducts a detailed research on the engineering management and construction quality control of the Beijing-Tianjin-Tanggu expressway overhaul which has strong reference significance on highway overhaul.
A Case Study on Mode I Fracture Modeling of Concrete
Authors: Li Xiao Qin , Chen Bao Qi , Li Ying Xian
Published: March 2015

This paper concerns the simulation of Mode I fracture with a local concrete damage model in explicit finite element code LSDYNA. A reliable modeling of fracture is essential in the analysis of tension-dominated problems, as well as the prediction of concrete damage due to cracking. A special focus of this paper is placed on an effective representation of the tensile localization in finite element modeling while generalized macro material properties are employed to modeling meso-scale problems. An investigation into the use of a typical damage plasticity concrete model within LSDYNA Explicit, based on the crack band theory, is described in detail. The main focus of the current paper is on the tensile softening branch.
A Review of the Durability of Recycle Aggregate Concrete
Authors: Liu Hong Bo , Sun Jing , Cong Xiao Hong
Published: March 2015

Analyzing the related literature at home and abroad, this paper summarized the results and shared them with reasearchers involved in the field on the recycled aggregate concrete (RAC). In this paper, the durability of RAC will be described from the following several aspects: absorption, chloride permeability, freezing and thawing resistance, carbonation, the sulfate corrosion resistance, drying shrinkage, creep and abrasion resistance. This paper expounded the present situation and progress in the study of the durability of recycled aggregate concrete.Then, some key technical problems needed to be studied were pointed out and many suggestions were put forward.
Aging Performance and Structural Study on Bio-Asphalt
Authors: He Min , Wang Hong Li , Cao Dong Wei , Zhang Mei Yu , Zhang Hai Yan , Chen Yan Ju , Zhang Yan Jun
Published: March 2015

This paper explains and demonstrates the aging performance and structure of bio-asphalt with analytical results from hot stage microscopy, infrared spectroscopic and nuclear magnetic resonance spectra. The experimental results showed that the aging of bio-asphalt is mainly caused by a large amount of coke substance generated during the process, and the addition of BHT can improve the aging resistance of bio-asphalt to some extent. Catalytic hydrogenation facilitate the removal of aldehyde, ketone and carbon-carbon double bond so as to strengthen the aging resistance of bio-asphalt, nuclear magnetic analysis further confirms the results from IR .
Finite Element Analysis of Sheet Pile Wharf with Separated Relieving Platform
Authors: An Jie Jing , Chen Xing , Wu Fei
Published: March 2015

This paper adopts finite element software ABAQUS to simulate the sheet pile wharf with separated relieving platform. Referred to the centrifugal test by Nanjing Hydraulic Research Institute, based on proper simplification and assumption, operating mechanism and characteristics of sheet pile wharf with separated relieving platform are researched from a new angle. Besides, main influence factors are chosen for further analysis, which provides a reference for designing calculation and optimization of sheet pile wharf with separated relieving platform.
Application and Improvement of Rock Quality Designation (RQD)
Authors: Zhao Zhi Peng , Zhi Jun Chao
Published: March 2015

When using Rock Quality Designation (RQD) method to evaluate rock mass integrity, the premises are often neglected and there are some limitations in RQD method. This study proposes a hole section statistical method and a rock block coefficient to supplement and improve the limitations of RQD method. The accuracy is verified by applying it to a reservoir.
Effect of Asphalt Film Thickness on the Performance of ATB Mixture
Authors: Zhang Zhi Feng
Published: March 2015

The rapidly development of highway needs the related research. For the lack of design method of mixture asphalt which based on performance and component, the related design method is needed urgently. This can be very important to the heavy traffic highway in construction in our country. This paper analyses the influence on the performance of ATB mixture in the view of asphalt film thickness. We consider the change law of the performance of ATB mixture in different thickness of asphalt film, and the various technical indicators to determine a reasonable range of thickness of asphalt film and provide a reference for the design of mixture asphalt.Key word: asphalt film thickness, bituminous stabilized macadam, comprehensive property
Effect of Deformation Parameters on Microstructure Evolution of Hot Deformed Superalloy GH4169
Authors: He Tong , Tuo Jing Hong , Li Zhi Hua , Tai Qing An
Published: March 2015

The evolution of the microstructure of a typical nickel-based superalloy GH4169 is investigated by the hot compression tests. The microstructural parameters such as fraction of recrystallization and grain size were analysed quantitatively. The results show that the effects of deforming temperature and strain rate on the dynamic recrystallized grain size are significant. With the deformed temperature increase and the strain rate decrease, the dynamic recrystallized grain size increases.
Effect of Water-to-Cement Ratio on the Property of a Macro-Porous Cementitious Microfiltration Membrane
Authors: Wang Zhe , Chang Jing , Chen Zhong Lin , Shen Ji Min
Published: March 2015

A novel cementitious microfiltration membrane was fabricated for water permeation. The membrane wasproduced using low-cost cement and quartz particles under ambient conditions, rather than a sintering process as was generally applied. By the analysis of SEM, pore size distribution and water permeation tests, the effect of water-to-cement ratio (w/c) on membrane structure was studied. The membranes havebimodal pore size distributions, with varying mean pore sizes of 6.5-8.7 μm. With the increase of w/c from 0.3 to 0.8, membrane pore sizes and porosities show a similar trend of first increase and then decrease. Moreover, membrane structure tends to dense in this process, which results in an obviously decrease ofmembrane water flux from 53 to 1 m3·m-2·h-1·bar-1.
Effects of Concrete Pavement on Atmospheric Thermal Environment Adjacent to Ground under Solar Radiation
Authors: Wang Xin , Liang Yong Fu
Published: March 2015

A numerical simulation has been conducted for concrete pavement on atmospheric thermal environment adjacent to ground under solar radiation. By computational fluent dynamics software Fluent, the finite volume method was used, and the solar radiation was described by the non-gray radiation transfer model and was solved by the Discrete Ordinate Method (DOM). The concept of constant temperature layer was introduced in order to determine the real temperature on pavement. Computed results indicate that the temperature on concrete pavement is impacted by the solar radiation significantly, and the atmospheric temperature falls down in geometric series with the increasing distance to ground. However, the effects of pavement on the temperature of ambient air beyond the near-ground region become much gentle. In comparison to the measured values, it shows that the current numerical method can simulate the interaction between pavement and ambient atmosphere effectively and can be extended to urban microclimate simulation.
Effects of Gamma Radiation on Thermal Properties of Benzoxazine Filled with Carbon Black
Authors: Tiptipakorn Sunan , Kuttiyawong Kamontip , Suwanmala Piriyathorn , Hemvichian Kasinee
Published: March 2015

In this study, the mixtures between benzoxazine monomer and electrically conductive carbon black (CB) were radiated with gamma ray at different doses, i.e. 0, 25, 50, 75, and 100 kGy before polymerization. The contents of carbon black filler were varied i.e. 0, 5, and 30wt%. The thermal properties such as curing temperatures and glass transition temperatures were determined using differential scanning calorimeter (DSC), while the decomposition temperature and char yields were analyzed using thermogravimetric analyzer (TGA).The results reveal that the radiation could decrease the curing temperature of pure polybenzoxazine. In addition, the decomposition temperature and char yield were increased with the increase of CB content. At the same CB content, the radiation dose could decrease the decomposition temperature and char yield.
Energy-Saving Analysis of Fly Ash Autoclaved Aerated Concrete Block Filler Wall
Authors: Guo Hai Yan , Ye Jian Bing
Published: March 2015

Taking a six-story glass bead thermal insulation concrete frame structure building in Kangding, Sichuan as model, to design filler wall composing of fly ash autoclaved aerated concrete block. Utilizing energy dissipation theory analyzes the building energy consumption. Conclusion: The glass bead thermal insulation concrete frame structure of fly ash autoclaved aerated concrete block filler wall meets the requirement of Sichuan residential building energy-saving code.
Experiment Research on Concrete Block by Ultraviolet Irradiation in Tibet Plateau
Authors: He Qiang , Xu Jiang , Chen Dong Dong , Wang Pei Qing
Published: March 2015

According to the characteristics of high altitude and strong ultraviolet radiation in Tibet, this paper do ultraviolet irradiation experiment research to different strength grades of concrete blocks in a closed laboratory, it is found that ultraviolet rays has promoting effect to early strength growth of test block, but the growth became slow along with the time.
Experiment Research on the Shock Resistance of Magnetite Concrete
Authors: Chen Zhen Fu , Zhang Kui , Li Tao
Published: March 2015

Through magnetite concrete beam under the action of gravity drop hammer impact dynamic bending test, reasonable testing program was designed to realize the whole process of dynamic test data acquisition, beam load and impulse, time history curves of displacement and force dynamic force - displacement curve and dynamic strain of fracture zone curve. By observing the destruction of the different strain rate，the constitutive relation of dynamic strength changing with the loading rate and input energy was studied. At the same time, the strain rate，the fracture process of different rate of damage and the destruction form need to be found.
Finite Element Analysis on Impact Factors of Castellated Steel Reinforced High Strength Concrete Beams
Authors: Meng Er Cong , Zeng Wen Xiang , Qiu Xiu Li , Su Yi Sheng
Published: March 2015

In order to verify the feasibility of ABAQUS, finite element simulation analysis is used to a castellated steel reinforced high strength concrete beam (CSRHSC beam) firstly. Then we consider the strength of steel, strength grade of concrete and thickness of steel protective layer as parameters to study the mechanical properties of the beam by ABAQUS. The results show that: The bearing capacity of beam increases when the steel strength improves, but the magnitude of increase will gradually reduce with the increase of steel strength. Along with the strength grade of concrete increase, the yield strength and ultimate strength basically tend to linear increasing, the ductility tend to decreasing. With the increase of thickness of concrete cover, the ductility of the beam improves but the ultimate strength decreases.
Experimental Investigation for the Influence of Recycled Aggregate Replacement Content on Tension-Compression Strength
Authors: Jia Zong Ming , Han Qing , Liu Ming Hao
Published: March 2015

Designing recycled concrete mixture proportion of different recycled coarse and fine aggregate replacement content by pulp content ,then testing compressive strength and splitting tensile strength. The text results show that: With the increasing of recycled aggregate content , the compressive strength and splitting tensile strength of recycled aggregate concrete trended to decrease. Compared to recycled coarse aggregate, recycled fine aggregate impact on the properties of recycled concrete is greater. Establishing the compressive strength and splitting tensile strength formula of recycled concrete based on a lot of experimental results.
Experimental Research on Chloride Resistance of Concrete with Isobutyl-triethoxy-silane
Authors: Wang Qi , Luan Hai Yang , Fan Ying Fang
Published: March 2015

The effect of different layers of silane impregnation on chloride resistance of concrete materials at various curing ages is systematically discussed. The chloride resistance of two types of concrete specimens with surface silane impregnation has been investigated through the Rapid Chloride Migration (RCM) method. The testing results indicate that the chloride penetration can be effectively restrained by silane impregnation, and the chloride diffusion coefficients of samples are significantly decreased. After curing for 28 days, when compared to the untreated samples, the chloride diffusion coefficients of two types of concrete specimens both with two layers of silane impregnation decreased by 37.4%, 37.6% respectively.