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原文传递 Mechanism analysis on overvibration of the prestressed box beam bridge impacted by driving vehicle

题名：	Mechanism analysis on overvibration of the prestressed box beam bridge impacted by driving vehicle
正文语种：	中文
作者：	林耀雄
关键词：	beam with non-uniform cross-section reflection the method of subdomain weighted residuals relative velocity and acceleration of vibration eigenvalue instable region of vibration excessive vibration
摘要：	The influence of decaying longitudinal pulses excited by a vehicle bumping at bridge abutment and expansion joints on the behavior of prestressed box beams was investigated.The analysis on the excessive vibration of the beam induced by longitudinal pulses and traffic load was carried out by using dynamic stability theory.Via functional transformation of the equilibrium equation,the method of subdomain weighted residuals was used to solve the corresponding homogeneous differential equation of vibration on the beam with non-uniform cross-section.Different solution groups were obtained by using different trial functions.The eigenvalues that indicated divergent property of the equation solutions were obtained depending on the relative velocity and acceleration defined in this paper.The instable regions of the beam's oscillation were determined via approximate treatment and numerical verification of the treatment was carried out.The influence of the damp and pre-applied force on instable region of the beam subjected to longitudinal pulses and traffic load was discussed and it was different from influence on condition that single periodic load was applied to the beam.Overvibration analysis of the beam based on the eigenvalues of increasing acceleration was developed.The further use of the eigenvalues was demonstrated.The analysis on overvibration of Bridge Crossing X Depot was also demonstrated as an example in appraisal of excessive vibration of highway bridges.The analysis and computation were implemented via subroutines which were programmed using Maple mathematical software package.
会议日期：	200910
会议举办地点：	长沙
会议名称：	2009全国土木工程博士生学术论坛
出版日期：	2009-09-30
母体文献：	2009全国土木工程博士生学术论坛论文集