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The Non-linear Dynamic Buckling Analysis of High Pier under the Foundation Shakes by the Earthquake

Author: SongJunZuo
Tutor: LuoSongNan
School: Hunan University
Course: Engineering Mechanics
Keywords: High Pier Seismic waves Geometric nonlinearity Dynamic Response Dynamic buckling
CLC: U443.2
Type: Master's thesis
Year: 2010
Downloads: 38
Quote: 0
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Abstract


High pier as the axial force bar Because of its flexibility , it is necessary to withstand the deck weight and impact loads , the safety performance of the pier by a great deal of attention , dynamic stability characteristics is the most important issue to consider , for high dynamic characteristics of the bridge pier foundation movement caused by seismic wave analysis and dynamic stability is very important. In this paper, considering the large deformation , the establishment of the basic equations of nonlinear dynamics in the high bridge pier foundation movement caused by the impact of the seismic waves ; by displacement - assuming , using the Galerkin method to the time rate of change of kinetic control equations ; the time rate of change of nonlinear differential equations is solved numerically . Displacement response , stability judgment BR criteria for high pier . The high piers instability of critical acceleration and instability moment . Provide a theoretical basis for engineering applications , the main contents are as follows: ( 1) Introduction the High Pier dynamic buckling Research , the basic theory of dynamic buckling problem . According to the characteristics of the force of the lever , geometric nonlinearity , the establishment of the basic equation of the buckling of high pier power . Runge - Kutta method for numerical calculation , gives the program design, introduced the basic theory of the Galerkin method . (2) discussion and analysis of the impact of seismic waves caused by ground shaking up and down the power of the High Pier buckling gives the foundation shake up and down the pier displacement response curve , different seismic strength and geometrical parameters on the high pier instability law . A numerical example is to compare the impact of the strength of the seismic waves , high pier flexibility, the quality of the deck the size of the the high piers critical seismic acceleration , unstable moment . (3 ) discussion and analysis of the the foundation horizontal movement of the seismic waves caused by seismic surface Rayleigh waves caused by the high bridge pier foundation elliptical motion stability issues ; different seismic intensity , different flexibility, and simplified high quality pier critical earthquake acceleration ; and comparative analysis of the critical seismic acceleration , instability moment with the quality of the deck , compliance coefficient , seismic waves of different intensity (peak ) variation .

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CLC: > Transportation > Road transport > Bridges and Culverts > Bridges constructed > Pier structure ( substructure )
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