| 移动随机荷载作用下桥梁振动分析 |
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| 引用本文： | 吕峰,林家浩,张亚辉.移动随机荷载作用下桥梁振动分析[J].振动与冲击,2008,27(12). |
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| 作者姓名： | 吕峰 林家浩 张亚辉 |
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| 作者单位： | 大连理工大学工业装备结构分析国家重点实验室,大连,116023 |
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| 基金项目： | 国家自然科学基金
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| 摘 要： | 为了研究移动随机荷载作用下桥梁的振动问题,首先利用虚拟激励法将随机荷载转化为确定性的简谐荷载,推导了桥梁的非平稳随机响应,包括演变功率谱和时变标准差;再将精细积分法扩展到求解移动简谐荷载作用下结构的动力方程,提出了协调分解过程来模拟荷载的连续移动.在数值算例中,研究了单跨及多跨桥梁的基本随机振动特性;讨论了桥梁模态之间的相关性和荷载之间的相关性对桥梁响应的影响.
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| 关 键 词： | 桥梁 非平稳随机振动 多点移动荷载 虚拟激励法 精细积分法 |
DYNAMIC ANALYSIS OF BRIDGES SUBJECTED TO MOVING RANDOM LOADS |
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| L Feng,LIN Jia-hao,ZHANG Ya-hui.DYNAMIC ANALYSIS OF BRIDGES SUBJECTED TO MOVING RANDOM LOADS[J].Journal of Vibration and Shock,2008,27(12). |
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| Authors: | L Feng LIN Jia-hao ZHANG Ya-hui |
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| Affiliation: | L(U) Feng,LIN Jia-hao,ZHANG Ya-hui |
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| Abstract: | In order to study dynamics of bridges subjected to random moving loads,the pseudo excitation method was used to transform random excitations into deterministic ones,and the non-stationary random response of bridges was derived,including the non-stationary power spectral densities(PSD)and the time dependent standard deviations.Then the precise integration method was extended to solve the equation of motion of structures under moving loads by enhancing the recently established consistent decomposition procedu... |
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| Keywords: | bridge random vibration moving loads pseudo excitation method precise integration method |
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