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Seismic Response Analysis of Skew Highway Box-Girder Briges

Author: ZhiWei
Tutor: ShenHuoMing
School: Southwest Jiaotong University
Course: Engineering Mechanics
Keywords: Skew bridge Slope Parameter analysis Ground motion Pier height Nonlinear
CLC: U441.3
Type: Master's thesis
Year: 2011
Downloads: 24
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Abstract

With the rapid development of science and technology, modern bridge design concepts and thinking also undergone tremendous change. The skew bridge because of its smooth lines and distinctive appearance of the structure is more widely adopted. In fact, skew bridge not only be able to better adapt to the terrain and environmental constraints, and in some cases, compared with the orthogonal bridge, it is possible to reduce the bridge length, thereby saving in material and investment. Firstly, a comprehensive exposition of typical the skew bridges earthquake damage phenomena, seismic damage mechanism and seismic response parameter analysis, and response spectrum method for the two seismic response analysis methods, and basic formulas and methods of computation of time history analysis method brief introduction, followed by the use of finite element software, to establish the finite element model of the skew bridge, the seismic response of the system parameters, the main conclusions drawn are: (1) single span simply supported skew girder bridge, whether it is using the response spectrum method or time history analysis method of calculation, the direction of ground motion input bearing shear size greater impact, and the extent of its influence with the changes in the tilt. When using the response spectrum method and direction of motion along the NT input combination of ground motion affects the the bearing shear size factor. (2) When considering stopper role, the obtuse angle at the horizontal thrust of the stopper to be greater than the acute angle at, and the block horizontal thrust to increase with the inclination reduced. (3) bias ply girder bridge with orthogonal beam bridge, the obvious difference is that the bias ply girder bridge the spatial coupling characteristics that produce internal forces at the same time in one direction, in an orthogonal direction will produce force, accompanied by the generation of the torque. The local vibration along the X and Y the N direction separately input, the degree of coupling of the pier bottom bending moment and shear force, the pier bottom torque size with increasing inclination is increased: when the local vibration along the T direction input, regardless of the inclination big produces no torque. This is because the T direction of Skew Beam Bridge Support supporting line direction, and does not exist in the direction of the bending and torsion coupling. (4) For continuous skew bridge a certain slope, the the pier bottom shear with pier increased little change, and no obvious rule, this is because of the the pier shear and pier stiffness directly related, the piers is shorter, stiffness relatively large shear large; pier higher stiffness is relatively small, but the large amount of structural response, shear may; the pier bottom moment with pier higher and higher, and is basically a linear relationship. (5) consider the nonlinearity of the bearings and piers, can effectively reduce the internal forces of pier bottom, this is because the hysteretic behavior of the bearings and piers consumes considerable energy.

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