Abstract: To study the ground vibration induced by high-speed trains across bridges, a field test was carried out in vicinity of a simply supported box-girder with a span of 32 m on Tianjin-Qinhuangdao railway line. Ground vibrations in the longitudinal, lateral and vertical directions were measured with trai...
Abstract: As nonlinearity component of motion-induced force plays a key role in wind-induced vibration of bridge, it is very important to reasonably determine the nonlinear aerodynamic parameters. According to the detached-forced vibration wind tunnel tests, an analytic identification method for nonlinear aer...
Abstract: In order to alleviate the sonic boom caused by aerodynamic effect in a tunnel, design parameters of the tunnel entrance with a flared hood were optimized. By solving the FW-H equation with Green's function, the pressure and pressure gradient of the initial compression wavefront in the tunnel were ob...
Abstract: In order to investigate the behavior of geogrid-soil interface of traxial geogrid, a series of laboratory pullout tests focusing on triaxial geogrid were conducted considering the effect of two kinds of pullout directions, referred to as TX_0 case and TX_90 case, respectively. The geogrid displaceme...
Abstract: In order to analyze the effect of creep in concrete and CFRP(Carbon Fiber Reinforced Plastic)on the axial compressive behavior of CFPP confined concrete column under the sustained load, a total of twelve circular columns specimens were tested under three types of the long-term axial load modes. The ...
Abstract: In order to investigate the influence of particle-size distribution on permeability of sand, the influence of uniformity coefficient, gradation coefficient, mean diameter, and void ratio on permeability coefficient was studied by constant head test. The significance of the influencing factors was th...
Abstract: In order to study the structural performance and its influencing factors of the Tou mortise-tenon joints which are widely used in the traditional timber buildings in the South Yangtze River Regions, the failure modes, hysteretic curves, skeleton curves, rotation rigidities of the mortise-tenon joint...
Abstract: In order to study the aerodynamic noise characteristics of motor car bogie in high-speed trains, an aerodynamic model of motor car bogie was established, a preliminary study on the aerodynamic noise source of the motor car bogie was made using the steady-state RNG k- turbulence model and the broadba...
Abstract: Electrical low-frequency oscillation in traction power supply systems causes vehicle traction system shutdown, which results in severe service delay. The mathematical descriptions of the oscillated voltage and current were presented based on the analysis of a large amount of measured data. The line ...
Abstract: As the key technology of new generation traction power supply system,the design of co-phase traction power supply system should match different connection traction transformers to optimize the comprehensive compensation strategy of power quality and reduce the capacity and cost of power flow control...
Abstract: The parameter design of grid-connected photovoltaic (PV) system is significant for its stable operation. In this work, a method of parameter coordination optimization was proposed for grid-connected PV system, by establishing the small-signal mathematical model of PV system, including PV cell, inver...
Abstract: Since complete fairness cannot be achieved in traditional two-party computation, a rational two-party computation protocol, based on game theory, was proposed, which regards player as rational. At first, the game model of secure two-party computation was put forward in the extensive game framework. ...
Abstract: The disassembly line balancing problem (DLBP) has been mathematically proved to be NP-complete. The search processes of traditional algorithms for DLBP are so random that they tend to get local optimum due to DLBP' s exponential time complexity for large scale cases. To overcome the shortcomings of ...
Abstract: To ensure energy-saving and punctual operation of urban railway, a time-approaching search method was proposed. The energy-saving control model of urban railway that satisfies timing running was established . A set of optimal conditions for energy-saving control was derived according to the Pontryag...
Abstract: In order to classify intersections of a city under saturated traffic operating conditions, sort-by-importance measures for intersections should be provided. Considering the static connections and dynamic influences of traffic volume between intersections, a key busyness index that can reflect the bu...
Abstract: In order to investigate the effects of transportation congestion and workload balance on the delivery routing of express delivery companies which wish to provide consistent services, a consistent vehicle routing problem considering traffic congestion and workload balance was proposed and a mixed int...
Abstract: To improve the carrying capacity of high-speed railway, the structure of the train diagram was optimized by drawing compact train diagram and designing reasonable operation scheduling for trains. The optimization problem of the train diagram structure was transformed into a traveling salesman proble...
Abstract: In order to correctly evaluate the reduction and sensitivity of fatigue strength to a notch of 5083-H111 aluminum alloy specimen in very high cycle regime, very high cycle fatigue tests were carried out by ultrasonic fatigue technique at a frequency of 20 kHz, using symmetric tension-compression loa...
Abstract: A prerequisite to establish the interrelation between the urban landscape pattern and ecological process is to make a quantitative description of roof landscape patterns. Taking roof area and isolation factor into account, three measuring indexes are constructed by the theory of island biography. Of...
Abstract: To reveal collapse mechanisms of shattered slope under wind loading, the slope stability assessment system was built. Based on the field survey of shattered slopes and valley wind measurement, the large-scale wind tunnel tests in various conditions were conducted by using Shidaguan collapse as an ex...
Abstract: In order to reveal the mechanism of loess landslide hazards induced by human engineering activities, typical loess landslide cases were studied using field investigations, physical model tests, and stress path tests. Analyses were made for the formation of shear zones triggered by heap loading, the ...
Abstract: In order to understand the mechanism of deep-seated catastrophic landslides and make prediction of their potential sites, some typical deep-seated catastrophic landslides occurred in Asia were analyzed comparatively. From the aspects of two landslide-inducing factors, earthquake and rainfall, the ch...
Abstract: Special soil such as loess, saline soil, red soil, Xiashu loess, soft soil, or solidified dredger fill, has high pre-consolidation pressure (Pc) and high over-consolidation ratio (OCR), and with the increase of soil depth, the Pc value decreases obviously. To investigate these uncommon facts, soil s...
Abstract: An investigation was made into several landslide cases in recent years to summarize common characteristics of the landslides composed of saturated loose granular materials. These landslides typically exhibited complete collapse accompanied by unique phenomena such as abrupt failure, static liquefact...
Abstract: In order to investigate the permeability of montmorillonite clay with different salt content under an electric field, a laboratory device was designed to capture the drainage, current intensity, voltage, and water content during electro-osmotic drainage tests at four different salinities in montmori...
Abstract: Massive loose deposits caused by the Wenchuan earthquake on May 12, 2008 have resulted in significant decrease of rainfall threshold of post-earthquake triggering debris flow in comparison with pre-earthquake level. Based on the post-earthquake debris flow characteristics analysis in the Longmenshan...
Abstract: Soil arch height of slope anti-slide pile determines the stress distribution of the pile and pile measures. The paper study the variation of soil arch height along the length of the pile, which could provide a theoretical basis for the precise design of slope anti-slide pile and measures between the...
Abstract: Talus mixed soil, widely distributed throughout the Western Sichuan mountainous area, is often unsaturated in nature. Dynamic shear modulus and damping ratio are essential parameters of the dynamic properties in the analysis of seismic response. In order to study the influential factors on these two...