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Zhang Y.-L.,Key Laboratory of Road and Bridge and Underground Engineering of Gansu Province | Zhang Y.-L.,Lanzhou Jiaotong University
Advanced Materials Research | Year: 2012

Based on mechanical properties of railway extradosed cable-stayed bridge with the rigid continuous beam system in the high-intensity earthquake zone, three kinds of scheme on seismic response reduction including viscous dampers, lock-up device and friction sliding bearings is presented in the text and effectiveness of seismic response reduction is analyzed by using non-linear time history response analysis. The results show that three types of isolation devices are significantly effective for improving seismic performance of the railway extradosed cable-stayed bridge. Seismic response reduction of viscous damper and Lock-up device is better, that of friction sliding bearing is second. but the type of viscous dampers is most optimal considering from normal use for structure and distribution of the seismic response in the structural system. Source

Jinxuejun,Lanzhou Jiaotong University | Wanggenhui,Key Laboratory of Road and Bridge and Underground Engineering of Gansu Province
Open Mechanical Engineering Journal | Year: 2015

Nonlinear hysteresis characteristics are usually used in the elastic-plastic seismic analysis of the structure of bridge. These characteristics may be described by the relationship of section bending moment and curvature. This relationship can be obtained by the section size and reinforcement, which is also a simple and timesaving method to evaluate the seismic behavior of the section. The thesis made a research of the effect of section bending moment and curvature first. Then chose five different sections and observed their effects on bending moment and curvature. The results indicated that, with the increasing of section size, the crack, the yield, the moment damage and the curvature of the section are increased. The increasing of section size is that the increasing of moment of inertia, so with the increasing of the moment of inertia, the resistance to crack, field and damage of the bridge pier is stronger. On the basis of this, the elastic-plastic time history analysis of Wu Guan super highway Gan Gou Zi Bridge is made. It showed that the capacity of energy dissipation by hysteretic of the Rectangular thin-wall pier is better than the twin shaft pier. So it is best to use rectangular thin-wall pier in the same condition. © Jinxuejun and Wanggenhui;. Source

Yu Y.-Y.,Key Laboratory of Road and Bridge and Underground Engineering of Gansu Province | Yu Y.-Y.,Lanzhou Jiaotong University | Yu L.-F.,Xian Railway Bureau
Jisuan Lixue Xuebao/Chinese Journal of Computational Mechanics | Year: 2010

Based on the method of reverberation-ray matrix, the velocity mobility, at the top of defective pile with variable sections embedded partially in homogeneous soil, under unit exciting force, is derived. The time velocity response at pile top is further obtained by inverse Fourier transform and convolution theorem acted by a half-sine impulse. The velocity mobility and reflecting waves of the neck-reduced pile, neck-expanded pile, and perfect pile embedded partially in homogeneous soil are compared. The effect of defective type, defective length, defective location and defective degree on velocity mobility and reflecting wave at the pile top are further analyzed, and the velocity mobility curves and reflecting wave curves of neck-reduced-expanded pile and neck-expanded-reduced pile embedded partially in soil are compared. It is shown that the influence of the medium change around the pile to mobility curves and reflecting wave curves is less than that of the defect of pile. Source

Zhang Y.,Lanzhou Jiaotong University | Zhang Y.,Key Laboratory of Road and Bridge and Underground Engineering of Gansu Province | Yan Q.,Foundation Research Institute
Advanced Science Letters | Year: 2012

In order to compare the similarities and differences between hollow pile and solid pile when they are subjected to dynamic loads at the top of pile, the dynamic performances of hollow pile and solid pile under lateral dynamic load were analyzed using composite stiffness principle and double-parameter method in this paper. The deflection, bending moment, rotation angle, shear and soil resistance were respectively calculated for solid pile and hollow pile with the same diameter and with the same sectional area by changing the cross-section shape and size of pile. The results of this research show that the hollow pile has many advantages compared with solid pile. For example, the deflection and rotation angle at the top of hollow pile is smaller, and the bearing capacity per unit volume of hollow pile is higher. The research of this paper provides a theoretical basis for the application of hollow pile in engineering. © 2012 American Scientific Publishers All rights reserved. Source

Chen Z.,Key Laboratory of Road and Bridge and Underground Engineering of Gansu Province | Chen Z.,Lanzhou Jiaotong University | Zhao D.-A.,Lanzhou Jiaotong University | Zhao D.-A.,Northwest University for Nationalities
Advanced Materials Research | Year: 2011

The substantial difficulties are encountered as the huge computation of complex three-dimensional finite element model. Network parallel computing is one of the most compelling topics at the forefront in the current field of parallel computing, the size and the speed of structural analysis can be increased by the combination of both, so that large and complex three-dimensional finite element calculation can be carried out smoothly. According to Wushaoling tunnel, three-dimensional finite element model is established and implement under the support of the finite element parallel computing environment of Deep Comp 1800 cluster system based on the analysis of neural network. The realization of 3D geostress analysis is also depend on the artificial neural network computation program ANNBP and MEBAC, which is an interface program connecting ANNBP and ANSYS. The results show that the computation efficiency is highly improved by the Deep Comp 1800cluster system, the distribution of the initial geostress field is compacted significantly by the faults and there is a vertical extrusion characteristic with the tunnel at the fault zone. © (2011) Trans Tech Publications. Source

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