bluuebunny/crossref_metadata_2025 huggingface dataset:
Finite Element Analysis on the Mechanism of Axial Turning-Grinding of Engineering Ceramics
Authors: Tian Xin Li , Mao Ya Tao , Guo Fang , Zhang Bao Guo , Wang Jian Quan
Published: September 2011

Axial turning-grinding is a high efficient and low cost method of processing engineering ceramics. During the research of its processing mechanism, by choosing diamond grits and alumina workpiece to creat model and using ls-dyna modeling software to simulate the stress changes and strain of the generation and development in the process of workpiece to study the mechanism of its processing, and analyzes the feasibility of this method combined with experimental results.
3-D Simulation of Heat and Moisture Transfer in Human-Clothing-Environment System
Authors: Li Feng Zhi , Li Yi , Lin Mou Guang
Published: September 2011

A 3-D heat and moisture transfer model for the human-clothing-environment system (HCES) is developed. The Smith-Fu’s finite element model is improved by considering more real 3-D geometry properties of the human body. Meanwhile, the heat and moisture transfer mechanisms, including water vapor diffusion, the moisture evaporation/condensation, moisture sorbtion/ desorption by fibers, and latent heat absorption/release due to phase change, are considered in a new 3-D clothing model. The clothed human body model predictions are compared with published experimental data at a variety of ambient conditions. The model predictions agree well with the experimental data, indicating that the present model has good prediction ability. Also, the model predictions are given by using the 3-D Figures.
Collaborative Design and Manufacturing in Research Flowchart for Large Aircraft
Authors: Liu Shao Chao , Yan Guang Rong
Published: September 2011

This paper introduces the division methods of aircraft research phases in foreign aviation enterprises, gives a general division method of aircraft research phases in our country and introduces the main task of each phase. Besides，it introduces the general content of collaborative design and manufacturing in research flowchart for large aircraft.
Hardware Design of Diameter Analyzing System for Liquid and Gas Pipeline
Authors: Sun Li Ying , Li Yi Bo
Published: September 2011

MFL_PIG (Magnetic Flux Leakage detector) is the most widely used long-range pipeline inspection equipment to detect corrosion condition of the pipeline and thus to avoid serious pipeline accidents. In order to collect the diameter information of the pipeline, geometry pig (also called diameter analyzing system) is used before applying the MFL_PIG. In this paper, the hardware design of a new modern smart diameter analyzing system which is suitable for detecting cracks and corrosions in the pipeline with different diameters is introduced. Miles round system,as one of important part of the system, is investigated in detail. A pulse optimum algorithm for miles round system is put forward and its principle and realization method is discussed. Reverse time algorithm is adopted in miles round system to solve the problem of location precision. In the end, one of the verification tests is given to measure reliability of the system and results showed that the optimum algorithm works well when frequency of the analog block wave is in the range of 100Hz to 1MHz.
Optimization Design of Crank Rocker Mechanism for a Torque Exciter
Authors: Zhang Xu , Bi Guo Jun , Li Li Wei , Cui Wei Wei , Cui Ji Jun , Cao Yang , Zhao Hai Rong
Published: September 2011

The dimension synthesis of crank rocker mechanism used in torque exciter was carried out with known angular displacement of rocker swing. Optimization method based on minimum kinetic energy of whole mechanism was adopted under constraint condition of minimum transmission angle and mechanism bar existence condition. Optimization design function was applied in solution and a design method of crank rocker mechanism was developed. The torque exciter has been in operation, achieving scheduled function for dynamic performance test, and all testing data are exact and valid.
Two-Dimensional Sine Filter Fingerprint Enhancement Algorithm Based on Block Level
Authors: Zhan Xiao Si , Chu Ya Yun
Published: September 2011

Enhancing low-quality fingerprint image is the effective method for improving the accuracy of minutia extraction and performance of the automatic fingerprint identification system. Fingerprint image is one kind of regular texture image in nature. To design two-dimensional sinusoidal surface model which accorded with the ridge gray distribution rule and propose the fingerprint image enhancement algorithm based on the two-dimensional sinusoidal surface model after analyzing the basic character of the fingerprint image. The experimental results indicate that the fingerprint image enhancement algorithm has better connecting ability for the broken ridges than the Gabor fingerprint enhancement algorithm. The algorithm can improve effectively the fingerprint image enhancement result and the accuracy of the minutiae extraction.
The Generalized Cross-Power Spectrum Method for Estimation of Time Delay in Acoustic Pyrometer
Authors: Li Cheng Zhi , Shao Fu Qun , Kan Zhe , Fan Hai Xiang
Published: September 2011

The acoustic pyrometer system uses physical properties of the gas and registers the perceivable temperature without the effects of radiation, and the measuring accuracy of acoustic wave flight time is the major factor in its application. The traditional correlation algorithm could not overcome convolution interference and calculate the time delay of acoustic signals accurately, under the low SNR (Signal Noise Ratio) and complex reverberation noise conditions. This paper presents a generalized cross power spectrum algorithm to filter the product and convolution interferences, and improves the performances of anti-noise and anti-convolution by whitening the sample signals and adjusting the weighted value of cross power spectrum algorithm with the variation of SNR. The experimental result and theoretical analysis showed that the new generalized cross power spectrum algorithm compared to the traditional correlation function analytical algorithm, can overcome the convolution interferences from reverberation noise, and sharpen peak value, thereby estimate the time delays of signals accurately.
Simulation of Responses of Liquid Filled Double Bottom Structures Subjected to a Closely Underwater Explosion Shock Loading
Authors: Tang Ting , Wang Li Jun , Ma Jin Bo
Published: September 2011

The purpose of this work is to study the effect of liquid in double bottom structures subjected to a closely underwater explosion shock loading. The comparative analyses are made by use of a commercial, explicit finite element program. Based on the difference of depth of liquid in double bottom structures and distance between explosive and outer bottom, six cases were simulated in this paper. The results show that liquid in cabins can enhance the resistance of double bottom structures to an underwater explosion.
Study on Dynamic Mechanical Response of TC21 Alloy
Authors: Zhao Shuang Zan , Cheng Xing Wang , Wang Fu Chi
Published: September 2011

Some results of an experimental study on high strain rate deformation of TC21 alloy are discussed in this paper. Cylindrical specimens of the TC21 alloys both in binary morphology and solution and aging morphology were subjected to high strain rate deformation by direct impact using a Split Hopkinson Pressure Bar. The deformation process is dominated by both thermal softening effect and strain hardening effect under high strain rate loading. Thus the flow stress doesn’t increase with strain rate at the strain hardening stage, while the increase is obvious under qusi-static compression. Under high strain rate, the dynamic flow stress is higher than that under quasi-static and dynamic flow stress increase with the increase of the strain rate, which indicates the strain rate hardening effect is great in TC21 alloy. The microstructure affects the dynamic mechanical properties of TC21 titanium alloy obviously. Under high strain rate, the solution and aging morphology has higher dynamic flow stress while the binary morphology has better plasticity and less prone to be instability under high strain rate condition. Shear bands were found both in the solution and aging morphology and the binary morphology.
Dynamics Simulation Study on Transmission Mechanism of Cross Rudder for Sightseeing Mini-Submarine
Authors: Zhang Xu , Chen Tao , Li Li Wei , Cui Wei Wei , Cui Ji Jun , Cao Yang , Zhao Hai Rong
Published: September 2011

Dynamics simulation analysis has been carried out for transmission mechanism of cross rudder for sightseeing mini-submarine. Based on FLUENT software solution, variation tendency of hydrodynamic coefficients of rudder blade versus different angle of attack has been obtained. High order function fitting of discrete hydrodynamic load versus angle of attack has been implemented on MATLAB. As output curve of fitting function updated constantly by interpolation, it has been taken as input of ADAMS dynamics simulation well. After friction and contact parameters of all kinematic pairs have been set reasonably in ADAMS, dynamics simulation has been worked out. Variation tendency of contact force between tiller and piston rod has been obtained through simulation results. It provides guidance for subsequent optimization design.
Research on Processing Techniques of Logging-While-Drilling Signal Based on BPSK Continuous Wave
Authors: Yuan Fang , Gong Xian Feng
Published: September 2011

The system of Logging-While-Drilling based on BPSK continuous wave is important for horizontal well prospecting. In this paper, the processing techniques of BPSK signal received on the ground have been studied. However, it is difficult to acquire the useful signals, since including most of reflective and mud pump noises. Based on the signal’s characteristic of sine, a new difference filter method, which is in the time field, is put forward. The method combines with the band-pass filter, which is in the frequency field, to reject the noises. Costas phase-locked loop technology and number control oscillator have been used in decoding technology, which can demodulate phase information and decode the BPSK signal. By the analyses in theory and experiment, the signal can be correctly decoded.
The Research and Application of Vehicle Identification Using KPCA Based on the Car Networking Environment
Authors: Xu Wei , Wang Ru Chuan , Huang Hai Ping , Sun Li Juan
Published: September 2011

Traffic systems are increasingly complex, and traffic management works will gradually to become accurate, informationized and intelligent. The traffic management mode based on the experience can no longer adapt to the requirements of development. The introduction of high-tech to control traffic is urgently needed.The proposion of car networking lays a theoretical foundation for this. In this paper, we design, implemented and evaluate a com-pact signal processing system on an embedded mote for vehicle classiﬁcation via acoustic characteristics. The main components of hardware system include a sound collector, an embedded mote and a wireless transmitting module. In software system we chose kernel principal component analysis (KPCA) as feature extraction method because of its high accuracy of nonlinear differential ability. This system enables an embedded mote to detect a passing vehicle and to decide its type. Using a testbed based on this system, we compare classiﬁcation quality with the combination of KPCA and SVM to other typical methods. Brieﬂy, we find that the KPCA yields better classiﬁcation quality than the others in vehicle identification.
Application of Multi-Sensor Information Fusion Technology in Machine-Tool Monitoring
Authors: Sheng Zhong Qi , Tang Chang Ping , Fan Hua Tao , Zhang Chao Biao
Published: September 2011

The structure and applications of multi-sensor information fusion technology are introduced systematically in this paper. Main fusion algorithms are summarized. The fusion applications are pointed out in machine-tool monitoring. The structure and information process of monitor system are discussed in the machine-tool monitoring.
Virtual Instrument Based Control System for the Heating Box
Authors: Zhang Li Ping , Cheng Bo
Published: September 2011

In some industry and physical systems, work pieces should be baked for a long time before it is used. During heating, the temperature should change according to a line with a given slope, and the vacuum degree should be propriety, so the monitoring and control system is necessary. The monitoring system is used to monitor the vacuum, temperature in the heating system, it can also start the whole system and stop it when the situation is emergent. The control system make the heating system keep a programmed temperature. In this paper, a heating box is design, when the vacuum in the box is lost, the interlock system will turn off turbo pump power supply; at the same time, the control and monitoring systems are designed, the control system is made by PLC and the morning system is constructed by LabVIEW program, and the two systems communicated each other through TCP/IP.
Hybrid Experimental-Dynamical Modelling of Cutting Considering the Complex Chip Geometry
Authors: Szalay Tibor , Horváth Mátyás , Tukora Balázs
Published: September 2011

The introduced cutting model uses the widely applied mechanical-dynamical differential Lagrange model together with one of the most popular experimental force model (Kienzle-Victor model) in order to provide the more accurate demonstration and simulation of cutting processes. To increase the reliability of the results the authors considered as much parameters and as complex chip geometry as the calculations and processing made it possible. In this paper the sophisticated model of milling operation was the aim of the authors. The simulation results show good equivalency with the measured real cutting experiments. In spite of the complexity of the equations the rapid development in the informatics (hardware and software tools) helped the handling and quick calculation of the equations in this type of models.
Analysis of 3D Terrain Reconstruction Model Based on Bezier Triangular Surface
Authors: He Bing Yan , Cui Jian Jun
Published: September 2011

The paper researches the general procedure and method of 3D modeling on the mine terrain surface. The terrain modeling is being reconstructed with Delaunay triangular network. On this basis, Bezier triangular surface is adopted to approach, which effectively solves the problems of unsmooth surface and large amount of data caused by 3D reconstruction.
Modeling and Simulation of Deceleration-Oriented Braking Control on Freight Train
Authors: Wu Meng Ling , Chen Teng Peng , Lu Yue Chao , Cheng Meng Ting
Published: September 2011

Based on the original Electronically Controlled Pneumatic (ECP) brake system of the heavy-haul freight train and SIMULINK, in this paper we establishes the vehicle longitudinal dynamics model and a new braking control mode (deceleration control) in order to reduce the shock caused by the impulse of the vehicles to the coupler so as to lessen the danger of coupler fracture. The author adopts the Smith-PID control compensating method as the core of the deceleration control so as to control the vehicle longitudinal dynamics model. Furthermore, by calculating the variation of the coupler force and comparing with the results of the original braking force control method, theoretically we can draw conclusion that deceleration control has high feasibility and superiority.
Comparative Research on Different Combination of the Rain-Wind Induced Vibration Models
Authors: Liu Xi Jun , Zhang Er Hui , Zhang Su Xia
Published: September 2011

In this paper, the comparative study of RWIV will be proceeding. Aim at the model of rivulet, a kind of sine function is accepted, and another kind of rivulet model is established on the basis of analysis on the stress of the rivulet. Aim at the model of cable’s initial curve under gravity, a kind of parabolic function is accepted, and another kind of model accepted as a catenary. Then, solve the equations of cable and the rivulet jointly by numerical method, get the characteristics of motion of the cable and rivulet, then investigate the factors which is related with the model. The influence of the different model of cable is very little when the rivulet model is assumed as a sine function. However, the influence of the different model of cable is large when the rivulet model is established on the basis of analysis on the stress. Then discover the catenary cable with moving rivulet is more rational with the field observation.
Simply Supported Box Girder Bridge Vibration Control with MR-TMD
Authors: Liu Xi Jun , Yuan Xiao Qin , Zhang Su Xia
Published: September 2011

MR-TMD is a new type of semi-active control device which combines with Tuned Mass Damper (TMD) and a Magnetorheological (MR) Damper. Taking German ICE3 high-speed railway train through 32meters simply supported box girder bridge for example, a dynamical model of Train-Bridge coupling vibration system is established by considering track irregularities. The relations between the bridge vibration and track irregularities with dampers are studied and the effects of vibration control with TMD and MR-TMD on the bridge are comparatively analyzed. The results show that the effects of track irregularities on vertical displacement of the bridge are relatively small, but on vibration acceleration are relatively large. As the train speed increases, the effects of track irregularities on the vibration acceleration is lager. As the track irregularities increase, the accelerations are greater. MR-TMD is able to inhibit vibration of bridge effectively, and has a wider control range and frequency bandwidth.
Probabilistic Analysis about Shrinkage and Creep Effect of Continuous Steel-Concrete Composite Beams with LHS
Authors: Zhao Gang Yun , Xiang Tian Yu , Xu Teng Fei , Zhan Yu Lin
Published: September 2011

Steel-concrete composite girder is consisted of concrete slab and steel girder connected through shear connectors. Owing to shrinkage and creep of concrete, redistribution of structural internal force and stress should be caused. It is widely accepted that shrinkage and creep models of concrete possess large randomness. The influences of stochastic variation of creep and shrinkage model, compressive strength of concrete, elastic modulus model of concrete, ambient humidity, load and shear connector stiffness on structural responses of continuous steel-concrete composite beam are investigated in the present study. Through Latin Hypercube Sampling (LHS) approach, the time variant probabilistic responses of deflection, interface slip, and stress of concrete slab and steel girder of continuous steel-concrete composite beam are studied.
Experimental Research on the Permanent Prestress of Transverse Prestressing Bundle for the Xiangjiang Yinpenling Bridge
Authors: Lu Si Ping , Zhao Ming Jian
Published: September 2011

In order to assess the service states of the permanent prestress of transverse prestressing bundle for the Xiangjiang Yinpenling Bridge (XYB), the permanent prestress values are measured. Appearance census of the diseases of transverse prestressing bundles for the cable-stayed part, the east and west incremental launching girder parts of the XYB are carried out. Three transverse prestressing bundles of the most serious corrosion are investigated by windowing damage inspection. The measured results and the analysis of the permanent prestress for the XYB show that the average permanent prestress of the three transverse prestressing bundles is about 300MPa to 550MPa, which do not meet the requirements of the design tension stress. It suggests that the appropriate treatment measures should be taken.
Simulation Analysis of the Pier of Urban Landscape Bridge
Authors: Yang Hong Yin , Chen Zhi Jun , Wang Zhan Zheng , Wang Ya Qi
Published: September 2011

The landscape is very important for the overpasses and other bridges built in the city. Not only should it be integration with land, sky and surrounding scenery, but also reflects the city's humanities content and historical background. Structures with landscape features, of which the forces are different from the normal structures, often have rather special characteristics. To ensure the safety of these structures, the test is often needed, and of course a lot of test equipments, sites and costs etc are required.Without the need of test sites, testing instrument, and test model fabricating, the simulation analysis, which could get better effect than actual model test in some cases, has been extensively applied in lots of industries, such as machinery manufacture, aerospace, civil engineering, etc. Be great reference value for the design of the bridge, the simulation process and relevant conclusions of a curve pier in Hefei (the flower city in China) are described in this paper.
Design of Reinforced Concrete Slant-Legged Rigid Frame Bridge
Authors: Zhao Shun Bo , Liu Shi Ming
Published: September 2011

This paper introduces the design of a reinforced concrete slant-legged rigid frame bridge built in a county town. The bridge shape and structural project were selected considering factors such as hydrology, environment, art expression and construction technology. The design software MIDAS Civil 2006 was applied to build the numerical model for analyzing the static and dynamic properties of the bridge structure. The results show that the loading performances of the bridge satisfy the specifications of current Chinese design codes. The bridge was constructed and had been operating since Oct. 2008. Now, it becomes a landscape of the county town.
Analysis of Equivalent Plastic Hinge Length of High Strength Concrete Bridge Columns by Using High Strength Reinforcements
Authors: Liang Yong Duo , Sun Zhi Guo , Chi Gong Cai , Si Bing Jun
Published: September 2011

The use of high strength reinforcement and high strength concrete in bridge columns is increasing due to many advantages of the high strength materials. In order to study the equivalent plastic hinge length of reinforced concrete bridge columns，37 column test results by using high strength reinforcement and high concrete were collected. Then, the equations proposed by Priestley, Paulay, Telemachos and JTG/T B02-01-2008 to predict the equivalent plastic hinge length of the columns were evaluated based on the experimental results. Influence factors which affect the equivalent plastic hinge length of high strength concrete bridge columns were studied through grey correlation analysis. It is found that, comparing to test results, all the proposed equations show considerable scatter in estimating the plastic hinge length of the high strength bridge columns using high strength reinforcement. The equations proposed by Paulay, Telemachos are not safe, while Priestley and JTG/T B02-01-2008 proposed equations give conservative results. Among the influence factors, the diameter of longitudinal reinforcement is the most important, secondly is the column length and section width. The axial load ratio of the column and transverse reinforcement of the specimens show small influence.
Study on Reliability Assessment and Mechanics Behavior of Slab Culvert under Heavy Train
Authors: Wang Qi Cai , Zhang Rong Ling , Ma Li Na , Wei You Xing
Published: September 2011

Abstract：The paper takes heavy haul train existing slab culvert disease and the research status for starting point, researches and analyzes the reliability assessment of slab culvert and fatigue test under heavy haul train. Different corrosion rate and reinforced section failure probability and reliable probability relations is researched as the emphasis . Strain-stress relations and slab culvert reinforced load are studied by the fatigue test , drawn the fatigue life of tensile steel. The research provides a reference for the stress analysis of slab culvert under the point supported conditions.
The Model for Predicting the Remaining Service Life of Reinforced Concrete Bridges in-Service and Applicability
Authors: Xiang Yi Qiang , Guo Dong Mei , Cheng Kun
Published: September 2011

There is a strong need in maintenance and management of bridge that analyzes and predicts remaining service life (RSL) of reinforced concrete bridge. Since structural resistance of concrete bridge is generally suffered from environment, load and material etc. factors, which are intercoupled and time-varying. Hence researchers should consider the economic development of road traffic area, environment of operational bridge, variation of load, deterioration law of materials, and maintenance cost of LCC for predicting RSL of bridge. This paper reviews recent model of predicting the remaining service life (RSL) for concrete bridge and serviceability, analyzes model characteristic and defects, and looks forward to future research from the viewpoint of structure durability, reliability and life cycle cost, respectively.
Research on Construction Technology of Inclined Pylon of Single Pylon Cable-Stayed Bridge without Backstays
Authors: Zhu Ying Lei
Published: September 2011

A new type of cable-stayed bridge, single pylon cable-stayed bridge without backstays is used in the Zhenshui Road Bridge in Xinmi City, China’s Henan Province, which adopts PC box girder with corrugated steel webs. It has many advantages such as light girder deadweight, low pylon height and avoiding webs longitudinal cracks. This novel bridge is adopted firstly in China. Cast-in-place method with bracket is used in the construction of the bridge’s inclined pylon because of its complex construction technology and tight construction period. In this paper, interests are focus on the scheme comparison and selection of bracket construction, the establishment of bracket’s computational model and the result of numeric analysis etc. The chief aim of this investigation was provides useful reference and enlightenment to similar bridge types.
Load-Carrying Capacity Inspection and Evaluation of Existing Pre-Stressed Concrete Hollow Slab
Authors: Ma Ya Li , Wang Dong Wei
Published: September 2011

Load-carrying capacity evaluation method of existing pre-stressed concrete hollow slab is represented based on the example, inspection content, method and result are introduced. Based on the result, carrying capacity condition is evaluated by the relevant code. The result can validate the rationality and effectivity of the method, which is useful for the carrying capacity evaluation of similar structure.
Study on Interaction between Mini-Pile and Slope under the Effect of Overloading
Authors: Sun Jian Ping , Zou Li Lei , Wei Huan Wei
Published: September 2011

Analysis interaction between mini piles and vertical slope under the action of overload, discusses the influence on mini pile and slope under different condition such as pile length,pile diameter and so on. The results showed that: (1)with the micro-pile length increases, bending moment of pile increase present a trend of increase, pile lateral displacement and the displacement of the slope decreases; (2)with the increase in diameter of micro-pile, bending moment increases, the lateral displacement of pile decreases, the slope of the displacement decreases; (3)with pre axial force of soil nails increase, bending moment of pile decreases, the lateral displacement of the pile decreases, the slope of the displacement decreases.
Study on Load Condition for in Service Bridges in Overload Non-Controlling Area
Authors: Zhou Xiang Hai , Du Juan
Published: September 2011

In order to investigate the development of vehicle loads on highway in recent years，data collection and statistical analysis of vehicle loads in overload non-controlling area were made．It is shown that all ti1e vehicle loads follow multiple-peaked distribution．The vehicle load probability distribution in overload non-controlling area was simulated using a weighted sum of 4 normal distributions．In order to describe the load limit of heavy duty vehicle for bridge safety accurately，the vehicle load probability distribution in overload non-controlling area was simulated by a piecewise function．The maximum probability distribution of vehicle loads during different periods were simulated by the distribution of I type extremum．
Monitoring of Concrete Durability and Application in Qingdao Bay Bridge
Authors: Shao Xin Peng , Ji Hui , Guo Bao Lin , Sun Zong Guang , Mao Jian Fei
Published: September 2011

The life of concrete structure located in complex environment depends largely on the durability of concrete. The various environmental corrosive effects are the key factor to reduce the durability of concrete structures. The studies on corrosion mechanism and detecting/monitoring technology are carried out in the world, and achieved important results. Since the 90's of last century, corrosion monitoring system for concrete structure has been put into engineering practice in the world, and the technology has been being mature. Qingdao Bay Bridge is located in the special marine environment, so corrosion is the main factor affecting the durability of the bridge. Durability monitoring is one of important aspects of the structure health monitoring and maintenance management system of the Bay Bridge. By corrosion monitoring, the critical data of concrete durability and strength degradation of the structure can be obtained. It is very significant for understanding the evolvement law of the durability, developing anti-corrosion measures, and extending the life of the bridge.
Self-Vibration Characteristics Analysis of the Yingzhou Bridge
Authors: Zeng Yan , Wang Zhi Yong
Published: September 2011

In this paper dynamic behavior of the Ying Zhou main bridge in Luoyang is studied .The finite element analysis software ANSYS is adopted to set up three-dimensional finite element model of a CFT arch bridge of the main bridge .The natural periods and modes of the CFT arch bridge are calculated by using the subspace iteration method. Meanwhile its modal characteristics are analyzed. Some useful conclusions are got by the calculation and analysis of the bridge for the engineering construction.
Experiment Study on Mechanical Characteristics Box Girder Bridge Considering Deck Pavement
Authors: Zeng Yan , Zhang Guang Bin , Wang Zhi Yong
Published: September 2011

In order to understand the mechanical characteristics of shenqiu Zhidian Bridge considering the influence of pavement, On the basis of installing steel mesh in rigid bridge or consecution to enhance the bonding performance between the pavement and girder, the load test is conducted. According to the test result and the calculations result the bearing capacity and work performance of bridge are evaluated. The results show that in the design of bridge, by enhancing the bonding performance between the pavement and girder, considering the overlaid pavement participating in force corresponds with the actual stress structure.
Seismic Response Analysis of Inclined Leg Rigid Frame Bridge Considering Soil-Pile Interaction
Authors: Zhang Chun Hui , Qi Xing Jun , Chen Qi Hui
Published: September 2011

In this article, an inclined leg bridge is taken as the research object. The three-dimensional finite element model is established, and soil spring is used to simulate soil-pile interaction. The dynamic characteristics of the two models are calculated. Two different ground motions are selected to analyze seismic response of the bridge. The dynamic characteristics and seismic response of bridge are compared in the conditions whether considering soil-pile interaction. The results show that the stress and displacement under qian’an ground motion action is bigger than that under Elcentro ground motion because the two ground motions have different frequency characteristics .After considering soil-pile interaction, the natural frequencies of inclined leg bridge decrease, and the longitudinal displacement of bridge increases obviously, at the same time the stress in the top and bottom of inclined leg increase obviously and the stress among main girder is not obviously increased. Soil-pile interaction maybe cause some adverse effect for inclined leg rigid frame bridge.
Seismic Mitigation Analysis of Viscous Dampers for Curved Continuous Girder Bridge
Authors: Liu Yi , Qi Xing Jun , Wang Yi Jian , Chen Shu Gang
Published: September 2011

The seismic response of curved girder bridge is more complex because of its irregular plane shape, therefore, the systematic study of an effective seismic mitigation method is required. In this article, the three-dimensional computational model of a double-pier curved continuous girder bridge is established and viscous dampers are added at the positions of sliding bearings. The full-bridge seismic response absorption effect is analyzed with the viscous dampers damping method under three ground motions of different frequency spectrum characteristic, and each ground motion contains three-direction. The results show that viscous dampers can reduce the difference of internal force between inner pier and outer pier in double-pier curved bridge, and it can also effectively reduce the bending and twisting coupling effect of curved bridge. But viscous dampers are sensitive to seismic spectrum to some degree, therefore seismic response absorption effect and sensitivity should be considered comprehensively when viscous dampers are selected.
Theoretical Investigations on Mechanical Stability and Electronic Structure of NbN under Pressures
Authors: Li Xiao Feng , Du Jun Yi
Published: September 2011

The ground structure, elastic and electronic properties of several phases of NbN are determined based on ab initio total-energy calculations within the framework of density functional theory. Among the five crystallographic structures that have been investigated, the hexagonal phases have been found to be more stable than the cubic ones. The calculated equilibrium structural parameters are in good agreement with the available experimental results. The elastic constants of five structures in NbN are calculated, which are in consistent with the obtained theoretical and experimental data. The corresponding Debye temperature and elastic ansitropies are also obtained. The Debye temperature of NbN in various structures consistent with available experimental and theoretical data, in which the Debye temperature of δ-NbN is highest. The anisotropies of ZB-NbN, NaCl-NbN, CsCl-NbN gradually increases. For hexagonal structure, the anisotropies of ε-NbN are stronger than that of δ-NbN. The electronic structures of NbN under pressure are investigated. It is found that NbN have metallization and the hybridizations of atoms in NbN under pressure become stronger.
Lvliang Typical Loess Landslide Mechanism and Characteristics
Authors: Tang Dong Qi , Peng Jian Bing , Wang Qi Yao , Xu Ji Shan
Published: September 2011

The loess area ecology environment is very fragile, happening various geological disasters, loess landslides is one of the most mainly the geological disasters in loess area. Lvliang region loess hilly develops common, with the human economic activities increasing, inducing a lot of loess landslides. Taking typical loess landslides as the main research object, the loess landslides of Lvliang region from two aspects of characteristics and mechanism are analyzed. It is considered that the main types of the loess landslides are located within the layer of loess. Landslide is controlled by topography and lithology, landslide mechanism is induced by human economic activities. Through research for the region loess landslides hazard prevention provide the scientific basis.
A Nonparametric Estimation on the Relations between Government Public Expenditure and Economic Growth
Authors: Duan Jing Hui , Chen Jian Bao
Published: September 2011

Based on the panel data of 30 provinces, municipalities and autonomous regions from 1994 to 2008, this paper uses the method of non-parametric estimation to do empirical analysis for the relations of physical capital stock, labor input and government public expenditure with GDP. The research results show that: The elasticity of physical capital stock, labor input and government public expenditure are e different at different times respectively; And the marginal effect of government public expenditure changes with the change of physical capital stock, labor input and government public expenditure.
A New Reliability Analysis Mehthod of Karst Roof Under Pile Tip
Authors: Jiang Chong , Li Xi Bing , Zhou Ke Ping , Wang Shan Wei
Published: September 2011

There is uncertainty during analysis the stability of karst roof under pile tip. The interval numbers are used to express the calculation parameters. Secondly, the limit equilibrium analysis model of karst roof under pile tip is presented based on the present study. Thirdly, the performance function is suggested to evaluate the reliability of the stability of karst roof under pile tip. The non-probabilistic reliability analysis method for stability of karst roof under pile tip is finally founded. This method is proved to be rational and feasible by engineering case analysis.
Bearing Capacity and Deformation Behaviour of Branch Pile
Authors: She Yue Xin , Chen Ya Dong , Wang Cheng Wu
Published: September 2011

The working mechanism of branch pile under vertical load is studied based on digital image correlation method in model test. Bearing capacity and deformation characteristics of equal-diameter pile and branch pile are obtained during the analysis. The study results show that the bearing capacity of branch pile is higher than that of the equal-diameter pile. The displacement field around equal-diameter pile is divided into the pile side and pile tip deformation regions, destruction pattern of single pile is similar to the Meyerhof's destruction pattern. Soil beneath branch generates a shear sliding surface under the ultimate load, and the soil beneath pile tip shows a pricking destruction pattern.
Stress Evolution and Deformation Control Technology for Deep Mining Influenced Roadway
Authors: Kan Jia Guang , Zhang Nong , Zhang Hai Wei , Zhang Zhi Yi , Si Guang Yao
Published: September 2011

In order to effectively control deep roadway under mining influence, based on the typical engineering geological conditions of Dingji coalmine in Huainan mining area, we researched on the laws of stress evolution and failure mechanism of roadway influenced by working face advancing by using numerical simulation and applying field test. The results showed that the surrounding rock stress of roadway ribs increased gradually with face advancing, vertical stress peak transfer to in-depth of roadway surrounding rock, the trend of roadway surface displacement variation consistent with corresponding stress variation. An appropriate coal pillar size (105 m) was proposed. We put forward the basic ideas for surrounding rock controlling and surrounding rock reinforce technology, namely U-steel support back grouting and bolt-cable cooperative supporting. By roadway deformation, roof layer separation and borehole detecting, we found out that displacement of roadway ribs was less than 250 mm, subsidence of roof was less than 110 mm, and the roadway deformation has been effectively controlled.
Effect of Fill Size on the Stability of Barrier Dams
Authors: Shi Zhen Ming , Wang You Quan , Chen Jian Feng , Shang Zu Guang , He Xiao Tao
Published: September 2011

The fills of barrier dams commonly result from high-speed landslides debris flow. In this paper, four model tests were conducted to study the effect of fill size on the stability of barrier dams. The failure time, failure mode, pore pressures and earth pressures were then observed and analyzed. The results show that barrier dams composed of coarse-grains or well-graded fills are more stable than those composed of fine-grained fills; coarse-grain-dams are more sensitive to the rising of water level than fine-grain-dams; the failure mode of coarse-grain-dams is usually overflowing-erosion and the barrier dams usually fail from the top of dams; the failure mode of fine-grain-dams is sliding and the barrier dams fail initially from the slope downstream.
Research on Micro Water-Resisting Property of Top Ordovician Strata in Pingshuo Coal Area
Authors: Rong Hu Ren , Bai Hai Bo , Chen Long
Published: September 2011

It is important to research the existence of the top Ordovician water-resisting strata, under which the regional Ordovician karts aquifers pose great water pressure threat to the upper late Carboniferous coal seam mining. So we take the samples from JK-02 to do mercury test, SEM and microscopic identification. The results show: ① 0 ~10m of the top strata of Ordovician is made of crystal powder dolomite. Most of the pores of the strata are intercrystalline pores, intercrystalline dissolved pores, microspore as well as stylolite ,and part of which are filled by calcite and clay. Its porosity is 11.3242%; and permeability 6.2324;and diameter of volume median 66.3nm; capillary median pressure 6.88MPa; mercury withdrawal efficiency is 42.22%; maximum pore throat's diameter is 145.32μm, and effective pore volume is about 13% out of total pore volume. ②10 ~112m of the top Ordovician is mainly made of powder crystal limestone and calsilutites. The most of pores are micropore; its porosity is only 0.8409% and permeability 7.0438; and diameter of volume median 66.3nm; and capillary median pressure 5.497~34.391MPa; maximum pore throat's diameter is 0.0227～0.453μm; ③The number of pores and the porosity of the limestone are less than that of the dolomite. The limestone of the top Ordovician can serve as water-resisting layer for its lower permeability and compactness if there is no water-conducted faults.
Application Research of Compaction Pile in Heavy Collapsible Loess
Authors: He Yong Qiang , Zhu Yan Peng , Wu Yun , Wang Xiao Qing
Published: September 2011

Compaction piles is one of the conventional methods for foundation treatment in collapsible loess, there are very few research results about soil compaction effect between piles when forming the piles. Firstly, the stress field and displacement field of soil around compaction piles are elastic-plastic analyzed on the basis of the cavity expansion theory; then a series of field and laboratory tests were performed to evaluate the treatment effect of the compaction pile composite foundation. The result shows that the collapsibility has been eliminated, all physical mechanics indexes have been improved, and soil compressibility and modulus of compressibility are also increased remarkably. It embodies the correctness of the computation theory. And the feasibility of the compaction piles composite foundation on collapsible loess area is further proved.
The Applicability of Existing Typical Liquefaction Evaluation Methods of Site Soils Based on Shear Wave Velocities for Bachu Earthquake
Authors: Shi Jiang Hua , Cao Zhen Zhong , Li Zhao Yan , Yuan Xiao Ming , Dong Lin
Published: September 2011

Based on liquefaction survey of 2003 Xinjiang Bachu earthquake of Ms6.8 and in-situ shear wave velocity testing data, the feasibility and applicability of five typical liquefaction evaluation methods which use shear wave velocities as criteria are presented herein. Analysis showed that none of the five liquefaction evaluation methods can provide a satisfactory result in Bachu area. The successful judging rates are only 36% to 64%. The intensity method which is employed to evaluate liquefied and non-liquefied sites in Bachu area provides only 40% successful judging rate, and the method is risky in intensity VII area and conservative in intensity IX area. The critical lines of the five methods deviate greatly from the actual lines. In intensity VII area all the five methods incorrectly misjudge. Further work has to be conducted to research on the soil properties in Bachu area and to establish the regional liquefaction evaluation method in Xinjiang.
Large-Scale Two-Dimensional Nonlinear Analysis on Seismic Effect of Fuzhou Basin
Authors: Jin Dan Dan , Chen Guo Xing , Dong Fei Fan
Published: September 2011

So far, nonlinear analyses on seismic effect of large-scale basin model have rarely been reported. Based on the explicit finite element method and 32 CPU parallel computing cluster platform of ABAQUS, a two-dimensional（2D） large-scale refined model for Fuzhou Basin is established using a nonlinear analytical method in the time domain. Both the peak ground acceleration (PGA) and acceleration response spectra of ground surface are emphatically analyzed. Meanwhile, the results by one-dimensional equivalent linearization method in frequency domain are added for the sake of contrast. The study results show that the PGA of ground surface will be obviously amplified when compared with the peak acceleration of bedrock ground motion; and the ground acceleration response spectra of Fuzhou Basin may appear a double-peak or multi-peak phenomenon. Moreover, the 2D large-scale model can reflect amplification effect of Fuzhou Basin soil to bedrock ground motion in particular periods; In addition, the acceleration responses of ground surface right above the bedrock valleys and crests appear larger than the other positions adjacent to them, these phenomenon are generally manifested as focusing effect and amplification effect, which are thought to be produced by the recently deposited soils in the basins as well as the special soil layer such as lens. In general, the PGA of ground surface obtained by 2D model present to be greater than that obtained by the one-dimensional model.
Physical Parameter Identification of Horizontal Layered Soil without Ground Motion of Bedrock
Authors: Wang Xiang Jian , Cui Jie
Published: September 2011

For linear parametric system, like mass proportional damping case, physical parameter identification of horizontal layered soil and inversion of ground motion of bedrock are done by using the Least-squares-based hybrid inversion algorithm. For nonlinear parametric system, such as Rayleigh proportional damping case, the modified Levenberg-Marquardt (mLM) method is introduced. Since the mLM method is sensitive to the initial values of parameter, a SVD-mLM method is proposed with combination of singular value decomposition (SVD). Parameter identification of nonlinear parametric system and inversion of ground motion are performed by using the SVD-mLM-based hybrid inversion algorithm. The numerical simulation results show that the identified parameters of horizontal soil layers and inversed ground motion of bedrock have high precision, and the proposed method is useful for geotechnical engineering and robust on noise.
Study on Critical Length-Diameter Ratio of Cement-Soil Pile Composite Subgrade under Rigid Foundation
Authors: Tao Chuan Qian , Xu Xue Yan , Xie Heng Yan , Zheng Xin
Published: September 2011

For cement-soil pile composite subgrade under rigid foundation, a three-dimensional nonlinear finite element analysis is performed to analyse critical length-diameter ratio based on deformation, which is first introduced, according to replacement ratio, pile-soil modulus ratio and the modulus ratio of substratum and reinforced area. It is found that critical length-diameter ratio of cement-soil pile under rigid foundation mainly depends on replacement ratio, the impact of pile-soil modulus ratio and the modulus ratio of substratum and reinforced area is relatively little.