近断层地震激励下的隔震桥梁参数优化

发布时间：2018-02-12 19:00

本文关键词： 连续梁桥隔震桥梁近断层地震铅芯橡胶支座参数优化振动台台阵试验　出处：《哈尔滨工程大学学报》2014年05期 　论文类型：期刊论文

【摘要】：为了解决隔震桥梁的梁体和支座位移在近断层地震激励下易超出容许值的问题,提出了基于混合罚函数理论的隔震支座参数优化方法。以四跨铅芯橡胶支座(LRB)隔震高架连续梁桥为背景,制作了该背景的1∶10缩尺模型桥,开展了模型桥振动台台阵试验。基于混合罚函数理论编制了用于优化LRB屈服力、初始刚度和硬化比的MATLAB程序,并分别对优化前后的模型桥在单条或多条地震激励下的响应进行了仿真和试验分析。结果表明:模型桥在优化前后的响应仿真值与试验值非常接近;多条地震激励下的目标函数值要比单条地震激励下的略大一些;优化后的模型桥在单条和多条地震激励下的梁体和支座位移均在容许值内,且各墩底内力均未明显增大。
[Abstract]:In order to solve the problem that the beam body and support displacement of isolated bridge easily exceed the allowable value under near-fault earthquake excitation, Based on the theory of mixed penalty function, a parameter optimization method for isolation bearing is proposed. A 1:10 scale model bridge with this background is made on the background of a four-span lead-rubber bearing and LRB-based continuous beam bridge of isolation viaduct. Based on the mixed penalty function theory, a MATLAB program for optimizing LRB yield force, initial stiffness and hardening ratio is developed. The response of the model bridge before and after optimization under single or multiple seismic excitation is simulated and tested. The results show that the response of the model bridge before and after optimization is very close to the experimental value. The value of the objective function under multiple earthquake excitation is slightly larger than that under single earthquake excitation, and the displacement of beam and support of the optimized model bridge under single and multiple earthquake excitation is within the allowable value, and the internal forces at the bottom of each pier are not obviously increased.
【作者单位】：东南大学土木工程学院;
【基金】：国家自然科学基金资助项目(51078077) “十二五”国家科技支撑计划资助项目(2012BAJ14B00)
【分类号】：U442.55

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