考虑地震动空间变化的曲线梁桥随机振动分析
发布时间：2018-11-05 15:43
【摘要】：为了从随机振动的角度研究地震动空间变化对曲线梁桥抗震性能的影响,以一座4跨混凝土连续梁桥为例,考虑了不同视波速、不同相干性以及不同场地条件对结构地震响应的影响,采用虚拟激励法对曲线梁桥在多维多点地震作用下的抗震性能进行了随机振动分析。结果表明:地震动的空间变化性会对曲线梁桥的地震响应产生显著影响;与一致激励相比较,结构在空间变化地震作用下的地震响应增大了2%~55%。其中场地效应对结构响应的影响最大。因此,在抗震设计中应充分考虑地震动的空间变化,以免低估结构的地震响应。
[Abstract]:In order to study the effect of spatial variation of ground motion on seismic behavior of curved beam bridge from the angle of random vibration, a 4-span concrete continuous beam bridge is taken as an example, and different apparent wave velocities are considered. Based on the effect of different coherence and site conditions on the seismic response of the structure, the random vibration analysis of curved beam bridges under multi-dimensional and multi-point earthquakes is carried out by using the virtual excitation method. The results show that the spatial variation of ground motion has a significant effect on the seismic response of curved girder bridges, and the seismic response of the structure under the action of spatially varying earthquake increases by 2 / 555 in comparison with the uniform excitation. The site effect has the greatest influence on the structure response. Therefore, the spatial variation of ground motion should be fully considered in seismic design so as to avoid underestimating the seismic response of the structure.
【作者单位】： 北京工业大学工程抗震与结构诊治北京市重点实验室;
【分类号】：U441.3
[Abstract]:In order to study the effect of spatial variation of ground motion on seismic behavior of curved beam bridge from the angle of random vibration, a 4-span concrete continuous beam bridge is taken as an example, and different apparent wave velocities are considered. Based on the effect of different coherence and site conditions on the seismic response of the structure, the random vibration analysis of curved beam bridges under multi-dimensional and multi-point earthquakes is carried out by using the virtual excitation method. The results show that the spatial variation of ground motion has a significant effect on the seismic response of curved girder bridges, and the seismic response of the structure under the action of spatially varying earthquake increases by 2 / 555 in comparison with the uniform excitation. The site effect has the greatest influence on the structure response. Therefore, the spatial variation of ground motion should be fully considered in seismic design so as to avoid underestimating the seismic response of the structure.
【作者单位】： 北京工业大学工程抗震与结构诊治北京市重点实验室;
【分类号】：U441.3
【参考文献】
相关期刊论文 前3条
1 王前信;伍国，
本文编号：2312523
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