bluuebunny/crossref_metadata_2025 huggingface dataset:
Experimental Investigation of Unbonded Post-Tensioned Short-Limb Shear Wall
Authors: Sun Wei Wei , Yuan Jun
Published: May 2011

In order to improve the seismic capacity of short-limb shear wall, two kinds of unbonded post-tensioned short-limb shear wall based on unbonded post-tensioned connections were put forward: (1) direct assembly short-limb wall; (2) hybrid assembly short-limb wall. The quasi-static cycle tests of two reduced scale specimens were conducted to simulate the seismic performance of 8-story symmetric double short-limb shear walls. The test results verified the basic design concept of unbonded post-tensioned short-limb shear wall, which requires that under strong earthquake action, the main part of coupling beam remains elastic and plastic deformation focus on the connection region of limbs and coupling beams. Therefore, the new short-limb shear wall is easier to fix. The test results also show the energy dissipation capacity of hybrid assembly short-limb wall is higher than that of direct assembly short-limb wall due to deformed bar crossing the interface between limbs and coupling beams.
Fatigue Life Evaluation of Existing Railway Riveted Steel Bridges
Authors: He Xu Hui , Wu Hai Tao
Published: May 2011

This paper aims to evaluate the fatigue life of an existing railway riveted steel bridge. Based on the measured train load information, the current load spectrum of the bridge is obtained, and the stress histories and stress spectrum of main members of the bridge are achieved using FE model and rain-flow counting method. The fatigue life of the bridge using traditional method is evaluated. At the same time, the finite element (FE) model of riveted component is established and the stress intensity factor of crack tip is calculated. The fatigue crack is simulated on the basis of linear elastic fracture mechanics (LEFM), and the fatigue life of the main members is also evaluated based on the damage tolerance analysis method. The evaluated results of fatigue life show that the fatigue remaining life of the bridge is very long due to the lower live load stress level.
Predict Research for Loss of Life Due to Dam Breach for Guangxi Luocheng Kama Reservoir
Authors: Ma Rong Yong , Chen Xiang , Yang Lei Lei , Zhang Xiao Qing
Published: May 2011

In this paper，the basic situation of Guangxi luocheng Kama reservoir and the potential dangers are introduced firstly, and then，different models often used to estimate the loss of life in dam failure at home and abroad are introduced and analysed.Based on the above, a suitable model for national actual situation is chosen to predict the loss due to this reservoir dam breach，and the severity according to the calculation result of assuming Kama reservoir dam-break is assessed. Finally, the relevant departments’s measures of rescuing and evacuating downstream masses etc. at danger in 2009 are proved to be correct，necessary and timely.
Influence of Earthquake Directions on Wind Turbine Tower under Seismic Action
Authors: Wang Lai , Dong Xi Tong
Published: May 2011

Influence of earthquake directions on wind turbine tower under seismic action are numerically investigated in this paper. First, equations of motion and an integrated finite element model of a wind turbine system consisting of a rotor, a nacelle and a tower shaft are established. Second, the finite element modal analysis is discussed. Third, relationships between upper displacements in x, y directions and bottom bending stress when the angle is 0, 30, 45, 60, 90 degree respectively between earthquake directions and concentrated eccentric mass direction (x direction) are analyzed by adjusted Taft seismic wave .The results show that: seismic responses of a wind turbine tower are remarkable and seismic action may be the dominant factor in the design of wind turbine towers that located at a seismically active zone. Under different earthquake directions structure’s dynamic responses are different, 90 degree with regard to x direction is the most unfavorable direction. Both maximum upper displacements in x, y directions and bottom bending stress appear at 90 degree direction with regard to x direction.
Research on the Seismic Response Characteristic of a Curved Ramp Bridge
Authors: Wang Tian Li , Li Qing Ning , Yin Hai Jun
Published: May 2011

In order to analyze seismic response of the curved ramp bridge, this paper selected a single curved ramp bridge in a multilevel junction system as its research object. Considering the piers, beams, bearings and expansion joints simulation, it respectively built the calculating models for a curved ramp bridge and a corresponding linear one. Using nonlinear time history analysis, the paper contrasts seismic response of the curved ramp bridge with that of the linear one in several different seismic inputs. Finally the seismic response characteristic of a curved ramp bridge is put forward.
Double Twisted Hexagonal Wire Mesh Retaining Wall Seismic Numerical Analysis
Authors: Li Yun , Qin Zhao Hui
Published: May 2011

Based on constitutive model of soil and reinforcement-soil, a numerical analysis program is compiled by finite difference method. Strength and deformation characteristics of double twisted hexagonal wire mesh retaining wall under seismic loading are analyzed by 3D finite difference method. The behaviors such as horizontal displacement, settlement of retaining wall, earth pressure of basement and distribution of lateral earth pressure along wall-back are obtained.
Three Directions Seismic Responses of Multi-Element Composite Foundation
Authors: Feng Xiao Juan , Cao Shu Wen , Huang Yi , Wu Bing Jun , He Bo
Published: May 2011

The equivalent continuous processing is done to multi-element composite foundation by composite material mechanics method, and the composite foundation is studied as transversely isotropic body, the constitutive relation of equivalent complex is established at first time. On the ABAQUS platform, the three direction seismic responses of multi-element composite foundation are studied by finite-infinite element coupling method. The results shown that: (1) the model of equivalent complex can reflect the working mechanics of the multi-element composite foundation; (2) with the increase of the total stiffness of the multi-element composite foundation, the max absolute values of horizontal accelerations and displacements decrease gradually. (3) With the increase of reinforced depth, the horizontal accelerations in reinforced area became small, but the displacements became big. The results can provide reference to the seismic design of structure.
Study on Long-Period Inelastic Spectra of Strong Ground Motion Containing Velocity Pulse
Authors: Li Chun Feng , Li Xiao Jun , Yu Yian Xiang , Li Yong Bo
Published: May 2011

In order to understand fully the effect of strong ground motion containing velocity pulse on constant-ductility long-period inelastic spectra, we synthesize two time histories, not containing velocity pulse, whose elastic spectra are identical to that of original time history containing velocity pulse, and whose peak accelerations are as big as that of the original time history. The reason why we synthesize two time histories for one original time history is to avoid the effect of randomicity in selecting sample. We select two time histories of 1999 CHi-CHi earthquake as original time histories, one of which has two synthesized counterparts. It is found that although the elastic response spectra of original time histories are identical with those of their synthesized counterparts, their constant-ductility long-period inelastic spectra are different. We consider that the difference results from the velocity pulses which exist in the original time histories.
Analysis of Dynamic Setting about Changbaishan Tianchi Volcano Future Eruption
Authors: Li Chun Feng , Zhao Qing Yin
Published: May 2011

Dynamic setting analysis of Tianchi Volcano future eruption is discussed by combining the analysis result of focal mechanism with that of structural geology. Analyzing anatectic earthquake focal mechanism shows that subduction of West Pacific Plate to the northeast of China makes the Tianchi Volcano region appear to press west-eastward. And analyzing focal mechanism of near-surface foci earthquake tells us that in the region, direction of the axis of the largest principal compression stress is NEE. The research result of structural geology displays that NWW faults around Tianchi is very active since Epipleistocene. Tianchi Volcano future eruption can be controlled by subduction of West Pacific Plate and strike-slip faulting along the NWW. In the end, the dynamic setting of Tianchi Volcano future eruption is put forward.
The Stochastic Seismic Response Analysis on Nonlinear Pile-Soil-Structure Interaction System with Uncertain Parameters
Authors: Zhou Ai Hong , Yuan Ying , Chen Ji Hua
Published: May 2011

In order to solve the problem of the analysis of seismic response for nonlinear pile-soil-structure interaction system with uncertain parameters subjected to stochastic external excitation, a simple and practical method was proposed in this paper, and the corresponding plug-in program was developed on the platform of universal software ANSYS. Firstly, the stochastic vibration analysis was converted into the definite harmonic vibration analysis accurately by means of the pseudo-excitation method. Secondly, perturbation theory of small parameter was introduced to consider the uncertain material parameters and direct interpolation equivalent linearization model was used to simulate the nonlinearity of material. Finally, the effects of the variability of shear modulus, damping ratio, density and Poisson’s ratio on the stochastic seismic response of the pile-soil-structure interaction system are studied. The results show that the variability coefficients of the response have the same magnitude as the input material parameters and the influence of the variability of material parameters on the response magnitude can’t be ignored.
Dynamic Responses of a Sedimentary Valley to Incident Waves
Authors: Liao Wen I , Sung Yu Chi , Hwang Jenn Shin
Published: May 2011

This paper presents the analysis of the dynamic response of a sedimentary valley subjected to incident plane waves. The sediment-filled valley is composed by a fluid layer over a soft soil deposit whose effect is of importance in the design of long span bridges with high piers. The method of analysis makes use of decomposing the problem into interior and exterior regions. In the exterior region, the scattered wave fields are constructed with two linearly independent sequences of Lamb’s singular solutions which satisfy the traction free conditions at ground surface and radiation conditions at infinity. For the interior regions, the wave fields for the fluid layer and soft soil deposit are expressed in terms of wave functions which satisfy the equation of motion. The continuity conditions at the interface of the media are satisfied in the least square sense. The effects of geometric topography, soil amplification and fluid layer under different types of incident harmonic plane waves are analyzed and discussed in detail.
Effects of Characteristics of Earthquake Motion on Elastic-Plastic Seismic Response of Single-Degree-of-Freedom
Authors: Li Yu , Zhu Xi , Yang Qing Shan
Published: May 2011

320 strong motion records of four sites are appropriately selected. The elasto-plastic dynamic analysis program is used to research the effects of characteristics of earthquake motion on elasto-plastic acceleration spectra, elasto-plastic displacement spectra, residual displacement spectra and reduced strength spectra. The study results are obtained as follow: 1) The value of elasto-plastic acceleration spectra, elasto-plastic displacement spectra, residual displacement spectra are increased with the amplification of seismic magnitude. 2) When site soil softens, the elasto-plastic acceleration, displacement, residual displacement of the same period are amplified in site Ⅲ and Ⅳ. On the contrary, site conditions of site Ⅲ and Ⅳ have nothing to do with elasto-plastic response spectra. 3) When ductility is greater than two, reduced strength spectra can be affected by seismic magnitude and site conditions. 4) Elasto-plastic response spectra of other protected earthquake intensity can be obtained by adjusting elasto-plastic response spectra of the standard protected earthquake intensity according to the ratio of PGA (protected earthquake intensity) to PGA (standard protected earthquake). So, some meaningful references are provided for performance-based seismic design for bridge.
An New Approach for Estimating Critical Injection Pressure and Fault Stability during Fluid Injection into Rock Reservoir
Authors: Zhou Jun Ping , Xiong De Guo , Xian Xue Fu , Jiang Yong Dong , Liu Zhan Fang , Gu Da Sheng
Published: May 2011

It is a well-known fact that an injection of the borehole fluids into surrounding porous rocks often results in fault reactivation,such as during hydrocarbon production from a reservoir, fluid injection for enhanced oil recovery, hot dry rock geothermal energy extraction, and waste disposal or carbon dioxide sequestration. However, no rigorously derived method for the description of spatial and temporal distribution of seismic events and for the estimation of the critical value of pore pressure of a porous rock sufficient for the generation of an microseismic has ever been developed. There a model developed within the context of Biot’s theory of poroelasticity is used to obtain the distribution of pore pressure, then the pore pressure is substituted into a Mohr–Coulomb failure criterion to predict the fault stability and the spatio-temporal cluster of microseismic events in a reservoir. in this model, the Biot system of equations is formulated for the radial symmetry case and is supplemented by the relevant boundary conditions, Then the solution is constructed analytically. A key advantage and the novelty of the proposed approach is it allows one to monitor an influence of pressure applied at the borehole within and surrounding reservoir and to predict the lower and upper bounds for the critical state of a natural rock, and it can be used in different reservoirs.
Study on Shear-Velocity Measurement by Seismic while Drilling
Authors: Jia Lian Jun , Guo Ming Zhu , Zhao Fang , Zheng Chan Chan , Meng Zi Yang , Jiang Qian
Published: May 2011

In recent years, Seismic While Drilling has rapidly developed at home and abroad, as a new down-hole seismic technique. It has widely used in petroleum exploration, drilling engineering and oilfield development. We intend to study on shear-velocity measurement by Seismic While Drilling. After introducing the principle of Seismic While Drilling, we have designed both observation system and data processing method of shear-velocity measurement by Seismic While Drilling, providing a reference for shear-velocity measurement in the future.
The Design of Performance-Based Seismic Analysis of Main Power Plant of the Conventional Island
Authors: Wang Gui Xuan , Zhao Jie , Liu Zhen , Zheng Yang
Published: May 2011

The performance-based design is a new development trend of seismic design. It is a breakthrough of the seismic design procedures. Based on the existing performance design method and some documents provided performance objective, computing and seismic structural measures, the performance-based seismic design is applied to the special structure of conventional island of the nuclear power plant. The performance-based seismic design is proved to be feasible according to a practical engineering case, as well the performance-based seismic design is needed to be further improved.
Analysis on Seismic Behavior of Irregular High-Rise RC Structure Using Eccentrically Braces
Authors: Guo Shi Qun
Published: May 2011

An anti-seismic analysis about two structures (an irregular high-rise building and the previous structure using eccentrically braces) is performed to study their torsional vibration response in earthquake. The self-vibration character and relative displacement between different floors are compared. It is found that adding some eccentrically braces properly can reduce the response of torsional vibration and other seismic response of the structures efficiently. From the example mentioned in the paper, it is verified that this method is a simple and economical one.
Effects of Tower-Line Coupling on Seismic Vibration Control of Large Crossing Transmission Tower-Line System with TMD
Authors: Wu Gang , Zhai Chang Hai , Li Shuang
Published: May 2011

At present, the effect of tower-line coupling is neglected in seismic vibration control with TMD for transmission tower-line system. However, for large crossing transmission tower-line system(LCTL), the neglect can affect the performance of TMD. In this study, a typical FEM model of LCTL is established. The effect of tower-line coupling on dynamic character of LCTL is analyzed. Then, the performance of TMD considering the tower-line coupling is compared with TMD neglecting the tower-line coupling. It is concluded that tower-line coupling affect the performance of TMD significantly for LCTL.
Peak Acceleration Uncertainty Analysis of Seismic Hazard Assessment
Authors: Jia Li Zhe , Duan Zhong Dong
Published: May 2011

The macroseismic intensity is a subjective indicator of ground motion intensity. Convex analysis method and China Probabilistic Seismic Hazard Analysis methodology are combined to derive peak acceleration for Ningbo city, China. The peak acceleration interval obtained by using the convex set theory-based seismic hazard analysis methodology is compared with that calculated by using China Probabilistic Seismic Hazard Analysis methodology. The sensitivity analysis indicates that the interval of peak acceleration is most sensitive to the annual occurrence rate. Furthermore, the correlation of uncertain variables cannot be neglected for peak acceleration prediction.
Convex Model for a New Lateral Load Pattern of Pushover Analysis
Authors: Jia Li Zhe , Duan Zhong Dong
Published: May 2011

The uncertainties of earthquake currently were not considered with the various lateral load patterns of pushover. The convex set theory, which requires much less information, is employed to model the uncertainties of the seismic influence coefficient maximum and the characteristic period of response spectrum. Then the convex analysis method is integrated into the fundamental equation of pushover, and the analytic relationship of lateral seismic load and top displacement of buildings is derived. The results of numerical example shows that the new lateral load pattern of pushover proposed in this research may effective simulate the uncertainties of strong ground motion.
A Bound Fragility Analysis Methodology Based on Convex Model
Authors: Jia Li Zhe , Duan Zhong Dong
Published: May 2011

The spectral displacement and the damage state medians were assumed as deterministic parameters in HAZUS-Advanced Engineering Building Module (AEBM). As the historical material and experimental data were insufficient to establish an exactly probability density function model of uncertain variable, the damage assessment results by probabilistic model derived from many assumptions and simplification were unreliable. The uncertainties of the spectral displacement and damage state medians were modeled by the Envelope Bound Convex Model. Furthermore, a bound fragility analysis methodology is derived by integrating HAZUS-AEBM module with the convex set theory. The fragility of a hotel in southern China are calculated and compared to the damage derived by HAZUS-AEBM method, and the results of fragility analysis are more sensitive to the spectral displacement and the damage state medians.
Parameters Optimization of Sliding Base-Isolation Structure under the Action of Coupling Earthquake
Authors: Zhang Yan Nian , Wang Yuan Qing , Shi Yong Jiu
Published: May 2011

In order to study the influence of the action of coupling earthquake to sliding base-isolation structure and improve its effect of vibration reduction by means of optimizing its major parameters. The theory of sliding base-isolation structure under the action of coupling earthquake is studied. A dynamic differential equation is developed. Seismic response analysis of 6-storey sliding base-isolation structure is processed, the results by exemplification show that the peak values of relative acceleration, relative displacement and inter-storey shear force of sliding base-isolation structure increase in different degree under the action of coupling earthquake. The increments increase with the action of earthquake in vertical direction increasing. In view of that SGA has such frequent shortcomings as premature convergence, oscillation and over-randomization in iterative process, a new genetic operator named transgenic operator had been developed for the purpose of improving SGA. Moreover, FBSA is proposed and combined with IGA. The parameters optimization model for the sliding base-isolation structure is set up. The various earthquake responses of sliding base-isolation structure get better control after it is optimized with IHGA. The results by exemplification show that IHGA is an efficient optimal method for parameters and layout optimization of sliding base-isolation structure.
The Application of Seismic Conceptual Design in the Shear Wall Structure System
Authors: Huang Xiao Yan , Zhao Fei , Chen Chao He
Published: May 2011

This paper illustrates the basic principles of "concept design" in seismic design of tall buildings, and presents the application of conceptual design in a specific shear wall structural design. Two different structural layout schemes of this structure are compared using a finite element analysis program.
Effects of Strain Rate on Reinforced Concrete Beam
Authors: Li Min , Li Hong Nan
Published: May 2011

The strain-rate effects of reinforced concrete beams are studied in this paper. Considering the strain-rate effects of structural material, dynamic responses of reinforced concrete beams subjected to monotonic loading and cyclic loading at different loading rates that might be experienced during earthquakes are simulated using the nonlinear finite element program ABAQUS. The influences of loading rate on loading capability and failure mode of reinforced concrete beams are investigated. The results show that as the loading rate increases, the loading capability increases, the increment is associated with the shear span ratio and loading mode. The increment at cyclic loading is smaller than that at monotonic loading; as the shear span ratio changes, the failure mode changes, the increment changes; the failure mode has nothing to do with the loading rate.
Studies on Seismic Demand Spectra Based on Strength Reduction Factor
Authors: Zhu Xiao Li , Cui Gao Hang , Tao Xia Xin
Published: May 2011

For resolving the practical problem about bridge structures, according to the seismic damage regularity and the structural characteristics, the capacity design method of bridge structure was introduced. In order to account synthetically for the influence factors and convert the inelastic seismic design method into the pseudo-static method, which is easily accepted by engineers, the strength reduction factor was commonly used in seismic design of structures. Based on the principles of the inelastic spectrum established by using the relationship between the strength reduction factor R and ductility factor μ, the seismic demand spectra were obtained from the design spectrum of the Highway Engineering Seismic Design Code (JTJ 004-89). This will be beneficial to the earthquake-resistant capacity design in practical bridge structures.
Testing and Simulation Analysis on the Settlement of Geosynthetic-Reinforced Pile-Supported Embankments on Soft Ground for the High Speed Railway
Authors: Jiang A Lan , Wang Mei Xia
Published: May 2011

The settlement of railway subgrade has an important connection with the quality, safety and natural life of the railway, the excessive settlement of subgrade will directly cause too many problems in the process of railway using. Especially in high speed railway, these problems will be more outstanding, thus affecting the development and progress of the railway. For the foundation of traffic infrastructure in areas with soft subsoil often embankments supported by piles are necessary due to the settlement requirements. For sufficient load transfer into the piles different construction methods are possible. For the construction of a high speed railway, a cement stabilization of the embankment material and geogrid reinforcement on top of the piles were used. Before the temporary load the settlement is monitored continuously for 10 months. In this paper, the method of construction is described and important field monitoring results are presented.
Finite Element Simulation Analysis of Ball Penetration Test on Asphalt Pavement
Authors: Li Yu Hua , Liu Yu Xing
Published: May 2011

Ball penetration test is used to measure the penetration depth of steel ball on the original asphalt pavement which is under impact load. The penetration depth is to evaluate the flexibility of the original pavement and one of mix proportion design parameters of chip seal. The test result is the plastic deformation of asphalt pavement under impact load. In this paper, layered half-space elastic-plastic model of the asphalt pavement is set up by transient dynamic analysis which is in structural analysis, the progress of the steel ball impacting pavement is numerical simulated, and the plastic deformation of asphalt pavement under impact load is studied. Results indicated that the using material parameters are mainly reasonable and the theoretical calculation result satisfies the requests of the engineering application. The method and results can be used in the theoretical analysis of chip seal mix proportion design.
Research of Steel Deck Pavement Suitable Paving Materials
Authors: Weng Yi Wei , Lin Jyh Dong , Huang Wei Hsing , Yeh Ming Chin
Published: May 2011

This study utilized mechanical calculation method and finite element method ABAQUS software to analyze the mechanical response of different flexible pavement material combinations on steel deck. Heavy vehicle load with high axle load and high tire pressure were considered, so as to know the reasons for steel deck pavement distress, and to define the arrangement principle for steel deck pavement and the combination of materials suitable for flexible pavement. The results show that the fatigue damage of steel deck pavement coincides with traditional theory, the maximum tensile strain at the bottom of surface course is still the determination index, and the fatigue crack is presented mainly in four types; the maximum compressive strain on the top of steel plate is the determination index of rutting damage, the major cause for rut is the surface course under compressive strain in the wheel load position. The suitable material for steel deck one-course pavement is full depth Guss asphalt mix; the suitable combination for steel deck two-course pavement is modified asphalt mix on top and Guss asphalt mix at bottom.
The Analyses and Calculation for Thermal Stresses of SBR Modified Asphalt Pavement
Authors: Zhang Min Jiang , Chen Gang , Hou Li Xia , Zhang Li Ping
Published: May 2011

Based on the viscoelasticity theory and the data of creep test, Burgers model was established, which was used to study the viscoelastic property of SBR asphalt mixtures, and the viscoelastic constitutive relation was obtained. Using the finite element method, the temperature stresses field was calculated under the environmental conditions and the thermal stresses of SBR modified asphalt pavement was given at the last part of this paper. The study indicated that SBR modified asphalt mixtures have the advantage over common asphalt mixture in low-temperature performance.
Analysis of the Relationship between Porous Pavement Thickness and Water Film Quantification
Authors: Lin Jyh Dong , Yeh Ming Chin , Hung C. T. , Chiou C. R.
Published: May 2011

This research mainly uses the image binaryzation to quantify water fog in order to have a better understanding about the water fog degree that drainage pavement reduces and the relationship between drainage pavement thickness and water fog. By observing the water fog that tires splash while raining, the study result shows that the most adequate pavement thickness of drainage pavement is 4cm. The water fog it reduces is double of 2.5cm drainage pavement. The thicker drainage pavement is also considered safer to drivers. About the drainage path, the shorter the faster it can drain off the rainwater and reduces the water fog degree that heavy vehicles splash.
Analysis on the Reliability of Asphalt Pavement
Authors: Yang Qing Guo , Dong Li Yan , Ning Jin Cheng
Published: May 2011

The asphalt pavements which are designed for 15-years usage are often highly damaged in the early period. In order to eliminate this phenomenon, researches have been carried out in many aspects, but the situation of asphalt pavement damage cannot be essentially changed. In the view of reliability, the frequent early stage damage phenomenon of asphalt pavements means that nowadays process of asphalt pavements must have not sufficient reliability, and just it leads the asphalt pavements can not reach the design purpose. Based on the basic engineering reliability theory, the reliability of the asphalt pavement design, from the determination of effect actions to selection of material parameters and the calculative model about pavement, has been analyzed; meanwhile the reliability of construction process has been analyzed too. The analysis on the reliability of asphalt pavement shows that the determination of design parameters makes the actual material is weaker than design; the construction process of the asphalt pavement makes the asphalt mixture greatly different anticipations and makes the layer condition deviated the ideal bonding condition. It is just these various uncertainties in design and construction that causes the asphalt pavement damage in early stage. So in order to change the situation of early damage in asphalt pavement, the effective measures are to focus on the reliability of design and constructions.
The Effect of Traffic Induced Vibrations at Early Concrete Ages on Concrete Tensile Strength
Authors: Wei Jian Jun , Wu He , Xing Jiao Xiu
Published: May 2011

Four combinations of frequency and amplitude induced vibrations and six start vibrated ages which ensured that the concrete would be exposed to vibration in each of the following age ranges: before initial set, during the setting process, and after final set are designed in the test. The purpose of the test is to testify whether the induced vibrations would affect the attainable tensile strength of concrete at cure ages of 1, 3 and 28 days. The splitting tensile tests are performed and 76 splitting tensile strength results are acquired. There are 29 groups splitting tensile strength weaker than the control group. Of the 29 results, they are all less than 10% compared to control ones, and the ones those less than 7% account for 76% of the weaken results. The test results have shown that, the induced vibrations designed in the test have a slight negative effect on the attainable the splitting tensile strength of concrete.
Experimental Research on Dry Shrinkage Performance of Ferrous Mill Tailings Stabilized with Inorganic Binding Materials
Authors: Pan Bao Feng , Chen Li Yuan
Published: May 2011

Dry shrinkage performance of ferrous mill tailings stabilized with inorganic binding materials with the optimal ratio is studied through laboratory test. The curves of water loss-time and dry shrinkage strain-time are obtained. The comparisons to that of soil-lime are also made. It shows that the largest for water loss ratio and dry shrinkage strain is soil-lime, its dry shrinkage performance is the worst. The dry shrinkage strain of ferrous mill tailings stabilized with lime added a small amount of cement is increased, however, the compaction is increased and the amount of lime and cost is greatly reduced. The dry shrinkage performance of those materials: ferrous mill tailings stabilized with lime the best, then ferrous mill tailings stabilized with lime (cement), ferrous mill tailings stabilized with cement, soil-lime.
Mechanical Response of Longitudinal Slope Segments Based on Burgers Model
Authors: Chen Bao , Wang Xuan Cang , Mu Ke
Published: May 2011

Asphalt Pavement was damaged more seriously in longitudinal Gradient than common segment because of its special load bearing conditions. This paper establishes a 3D Visco-elasto-plastic Finite Element to analyses the stress respond of pavement structure, calculating the discipline of stress behaviors under different gradient. Burgers model was used to study the factors which can influence on tracking, for example longitudinal Gradient, speeds and frequency of axle load. Result of calculation show that the maximum shear stress grows as the gradient increases. Rutting of pavement was small before a certain number of axle loads, but when beyond the certain number, the rutting incense notably, and the slower speed the vehicle has, the deeper tracking the pavement responds.
Laboratory Evaluation of Warm Stone Matrix Asphalt Mixture
Authors: Du Shao Wen , Li Shan Shan
Published: May 2011

Two kinds of warm additives, Sasobit and Evotherm DAT, were used to develop warm stone mastic asphalt (SMA) mixture. The test results showed that compaction temperature of SMA can be decreased by 30-40°C when using Sasobit or Evotherm DAT. Then, to compare the mechanical performance properties of SMA and warm SMAs, mechanical properties of pavement mixture, including Marshall stability, retained Marshall stability, tensile strength ratio, Cantabro loss, rutting dynamic stability and low temperature flexural strength, were tested in laboratory. The results indicated that Sasobit can decrease obviously the moisture resistance ability and low temperature cracking resistance ability of SMA. Therefore, the pavement performance properties of Sasobit warm SMA are inferior to those of Evotherm DAT warm SMA, which has the nearly same performance properties as hot SMA.
Applying Basic Oxygen Furnace Slag in Porous Asphalt Pavement
Authors: Lin Jyh Dong , Hung C. T. , Chen Shih Huang , Yeh Ming Chin
Published: May 2011

The benefit using BOF slag on Perpetual Pavement that has been developed in United States and Europe recently, will effectively increasing Rutting and Skid Resistance of Pavement, reducing the amount of asphalt that used on Mix Design that will reduce the overall construction cost. The character of BOF slag has higher density and Hydrophilic, this study applied it to porous pavement. It compared with the performance of traditional aggregates. Based on the result, there are no significant differences. The BOF slag will be expansion with water, it was bad in pavement construction. Through swelling pressure test, the BOF slag with new process is no significant change in water. So, BOF slag is suitable in porous pavement.
Low Temperature Cracking Evaluation of Asphalt Rubber Mixtures Using Semi-Circular Bending Test
Authors: Liu Jing Hui
Published: May 2011

Low temperature cracking is the main distress in asphalt pavements in winter. As asphalt rubber course is increasing, there is no standard method to characterize the resistance to cracking of asphalt rubber mixtures. This paper investigates the use of a Semi Circular Bend (SCB) test as a candidate for a low-temperature cracking specification. Based on the SCB test, this paper presents the findings of a laboratory study that aimed to evaluate the effects of recycled tire rubber on the Low temperature cracking properties of asphalt mixtures. Three mix types, a conventional hot-mix asphalt concrete, a dry process rubber modified asphalt concrete, and a wet process asphalt-rubber asphalt concrete, were included in the investigation. It is found that the asphalt mixtures produced by the wet process showed much better low temperature crack resistance, the binder effect modified by rubber was significant.
Experimental Analysis of Dynamic Modulus and Phase Angle of High Modulus Asphalt Mixture
Authors: Ren Rui Bo , Geng Li Tao , Wang Li Zhi , Wang Peng
Published: May 2011

To study the mechanical properties of high modulus asphalt mixtures, dynamic modulus and phase angle of these two mixtures are tested with Simple Performance Testing System under different temperatures, loading frequencies and confining pressures. Testing results show the superiority of high modulus asphalt mixture in aspect of high temperature performance. Furthermore, the changing rules of dynamic modulus and phase angle are also discussed.
Mechanism Analysis of GSPS System Strengthening Soft Base
Authors: Liu Yan Yan , Ling Tian Qing , Huang Zhong Wen
Published: May 2011

This paper analyzes the mechanism of geogrid-broken stone pile reinforced sand-gravel cushion soft base strengthening system (GSPS) using finite element based on the substantial project of a expressway in Sichuan province. The calculation results indicate that the GSPS system can significantly improve the vertical displacement (settlement) of subgrade with the vertical displacement around pile decreasing around 15%, and the subgrade displacement tends to be more uniform and smooth. Also, the GSPS system improves the horizontal displacement of subgrade the most compared with the common broken stone-pile, sand cushion and reinforced cushion. The embankment becomes relatively light when it is low, and the main top loads are borne by geogrid-broken stone piles. With the top loads increasing, the loads shift to the soil among piles, and the pile-soil stress ratio increases with the increase of stress level. The test and analysis results show that the value range of pile-soil stress ratio is 1.88~3.40.
Free Vibration of Orthotropic Plate on Foundation with Four Edges Free by Finite Integral Transform Method
Authors: Zhong Yong , Gao Yuan Yuan
Published: May 2011

The double finite cosine integral transform method is exploited to obtain explicit solutions for the natural frequencies and mode shapes of the orthotropic rectangular plate on foundation with four edges free. In the analysis procedure, the classical Kirchhohh orthotropic rectangular plate is considered and the Winkler elastic foundation is utilized to represent the elastic foundation. Because only are the basic dynamic elasticity equations of the orthotropic thin plate on elastic foundation adopted, it is not need prior to select the deformation function arbitrarily. Therefore, the solution developed by present paper is reasonable and theoretical. In order to illuminate the correction of formulations, the numerical results are also presented to comparing with that of the other references.
Analysis on Qinyu Landslide and Treatment Measures in G212 Highway
Authors: Li Hui Shan , Liu Han Qing , Li Ping
Published: May 2011

G212 highway is a primary route from Gansu to Sichuan province. Landslides and debris flows along G212 highway often occurred in Longnan region of Gansu province. According to finite element method of saturated-unsaturated seepage, variation of pore water pressure of saturated-unsaturated slope under transient seepage field was simulated in the cases of rainfall and groundwater and safe factor of the slope stability was obtained, based on Fredlund’s strength theory of unsaturated soil and Bishop’s method. As an example of the Qinyu west landslide, the drainage, guarding face wall and frame structure with pre-stress anchor rod were very effective and feasible for the landslide treatment measures.
Experimental Study on Water Seepage Rate with Crack Width of Continuously Reinforced Concrete Pavement
Authors: Luo Zhu , Tian Bo , Liu Ying
Published: May 2011

In order to discover the water damage mechanism of CRCP, the simulation test was established to study the relationship between crack width and seepage rate. The results show that the seepage rate increases with the widening of crack. For reducing water damage and improving pavement performance, some essential waterproof measures, according to the amount of rainfall, should be taken in designing the CRCP.
Study on Bearing Capacity of Reinforced Concrete Column with Z-Shaped Cross-Section under Biaxial Eccentric Compression
Authors: Wang Tie Cheng , Chen Xuan
Published: May 2011

Making use of the numerical analysis method, the bearing capacity of reinforced concrete column with Z-shaped cross-section subjected to biaxial eccentric compression was analyzed in this paper. Some factors affecting the ultimate bearing capacity of Z-shaped reinforced concrete column were studied, such as loading angle, ratio of axial compression, reinforced ratio, concrete strength and reinforcement arrangement in the limb. It is shown that the worst loading angle was near the second center bisector, the bearing capacity can be improved by enhance reinforced ratio, rebar strength or concrete strength, and the reinforcement arrangement in the limb had little effect on the bearing capacity.
Field Test of Blasting Vibration and Regression Analysis
Authors: Zhang Yuan Juan , Huang Jin Xiang
Published: May 2011

In order to obtain blasting vibration attenuation rule of a soil-rock blasting, the basis theory may provide for later blasting construction, after the blasting vibration monitoring of blasting construction ,the correlation coefficient K and α can be obtained by sodev’s empirical formula and its linear correlation coefficient is significant,the result has guiding significance in blasting construction. Regression formula error is between 6% to 23% in vertical, between 17% to 25% in horizontal radial and between 4% to 25%. If inflection point is eliminated, and the blasting is safety to the nearby buildings. The analysis results has its guiding significance.
Research on Planning Method of Frontier Regional Road Network
Authors: Gao He , Zhang Zhi Yong
Published: May 2011

The research on planning method of the frontier regional road network can be a good method to solve the pressure of border highway network, which comes from the transportation demand of combat readiness. Based on the traditional traffic demand forecasting method of "the four stages", combined with the characteristics of the frontier regional traffic demand, this paper establishes the forecasting models for tactical and strategic traffic demand. According to the militarization of the frontier regional road network, the concept of military importance degree is proposed, and the node importance degree model of highway network is improved. Moreover, the best-scale method and gradual-adjustment method are selected as the optimization of the frontier regional road network planning. Finally, the traffic demand forecast, the node important degree calculation and the optimization of road network layout are studied, which are based on the simulation of the frontier regional road network, and the planning model’s validity of the frontier regional road network is examined.
Experiment Study on Dynamic Response of Rough AC Surface under Vehicle
Authors: Zhang Guang Hai , Kang Hai Gui , Zheng Yuan Xun
Published: May 2011

In order to study dynamic response of rough road surface resulting from different speeds and loads under a certain roughness for purpose of effective enhancement pertinence for structural design of an asphalt pavement and extension of its service life, displacement meters, stress meters and strain meters are embedded at different structural layers on the rough road surface to monitor the dynamic responses of AC pavement. The result shows that roughness can dramatically increase response on an asphalt road surface resulting from load and speed.
Ticket Income Distribution of Urban Rail Transit in Network Operating Condition
Authors: Huang Yuan Chun , Li Jian , Pan Haize
Published: May 2011

Through analyzing the factors affecting passengers’ path-choice, the corresponding principles and rules of the ticket income distribution are put forward and the new model of the Urban Rail Transit Network in Beijing is set up in the paper. Through the deformation of the urban rail transit and the simplification of the lines, the topology of the urban rail transit lines is abstracted into an undirected connection graph. Breadth-priority optimization algorithm is applied to search the effective paths between the OD and the flow-matching ratio is acquired by calculating based on multi-factor matching algorithm, in which many relevant numerical examples are analyzed to verify the feasibility of the dual-ratio method and to summarize the characteristics of the project.
Predicting the Ultimate Bearing Capacity of Single Piles Based on CPTU
Authors: Miao Yong Hong , Cai Guo Jun , Liu Song Yu
Published: May 2011

Six methods to determine axial pile capacity directly based on piezocone penetration test (CPTU) data are presented and evaluated. Analyses and evaluation were conducted on three types piles that were failed during pile load testing. The CPT methods, as well as the CPTU methods, were used to estimate the load carrying capacities of the investigated piles (Qp ). Pile load test were used to determine the measured load carrying capacities (Qm). The pile capacities determined using the different methods were compared with the measured pile capacities obtained from the pile load tests. Two criteria were selected as bases of evaluation: the best fit line for Qp versus Qm and the arithmetic mean and standard deviation for the ratio Qp /Qm. Results of the analyses showed that the best methods for determining pile capacity are the CPTU methods.
Passing Stage Division of Bicycle Groups at Signalized Intersection
Authors: Yu Quan , Shi Li Ping , Li Ning , Deng Xiao Hui
Published: May 2011

This paper presents a simple identifying method of bike group ,then takes bicycle groups of signalized intersection as the research object, investigations and video cameras are carried out at two signalized intersections in Beijing and Tianjin city. For the data analysis,by using K-means cluster analysis method ,this paper selects three criterions which are the average speed of bicycle group,the width of bicycle group and the length of bicycle group. Based on three indexes , the passing stage of the bicycle groups at two signalized intersections of Beijing city and Tianjin city are divided into three stages :the first stage for bicycle group gradually spreading ,the second stage for expanding ,the third stage for gradually shrinking.The research on the passing stage of bicycle group starting and running through the intersection at the signalized intersection are useful for determining the capacity of vehicles with the impact of bicycle , and for calculating the signal timing of bicycle under the mixed traffic flow condition at signalized intersection.
Dynamic Model Research of Departure Time and Route Choice Based on Prospect Theory
Authors: Yang Zhi Yong , Yan Gui Yun
Published: May 2011

This paper takes commuters’ daily travel as research object to build model of travel choice which contains departure time and travel route based on Prospect Theory. Choosing the time of arriving destination as reference point, commuter will choose the time at which he/she can obtain the maximum value as departure time, then establishes choice model of departure time. Using Bayesian Theory to update and adjust route’s forecasting travel time in light of traffic information provided by Advanced Traveler Information Systems (ATIS) and travelers’ previous experience information. Gets decision weighting function after having analyzed traveler’s individual subjective probability which is about the possible result for route choice, then obtains the expression of travel route’s prospect value and gets route choice model. Finally, by designing a network to analyze the dynamic choice model, and achieves expected effect.