考虑冲刷作用效应桥梁桩基地震易损性分析

发布时间：2018-06-05 12:03

本文选题：冲刷效应 + 地震　；参考：《地震工程学报》2017年01期

【摘要】：冲刷造成桩周土体的剥蚀将会削弱土体对桩基的侧向支撑能力,冲刷效应会对桥梁桩基的地震易损性产生影响,因此有必要对冲刷和地震共同作用下桥梁桩基的易损性进行研究。利用SAP2000软件建立三维桥梁有限元模型,通过非线性时程分析得到桥梁桩基地震响应峰值。采用概率性地震需求分析方法,建立不同冲刷深度下桥梁桩基地震易损性模型,在地震易损性函数假设为对数正态分布函数的基础上,通过回归分析得到概率模型中的参数,进而得到不同冲刷深度下桥梁桩基在不同破坏状态所对应的地震易损性曲线,并分析冲刷深度对桩基破坏概率的影响。研究结果表明:随着冲刷深度的增加,桥梁桩基在地震作用下的破坏概率显著增加。
[Abstract]:The erosion of soil around the pile will weaken the lateral support capacity of the soil around the pile foundation, and the erosion effect will affect the seismic vulnerability of the bridge pile foundation. Therefore, it is necessary to study the vulnerability of bridge pile foundation under the joint action of scour and earthquake. The finite element model of three dimensional bridge is established by using SAP2000 software, and the peak value of seismic response of bridge pile foundation is obtained by nonlinear time history analysis. Using the probabilistic seismic demand analysis method, the seismic vulnerability model of bridge pile foundation under different scour depth is established. On the basis of the assumption that the seismic vulnerability function is a logarithmic normal distribution function, the parameters in the probabilistic model are obtained by regression analysis. The seismic vulnerability curves corresponding to different failure states of bridge pile foundation under different scour depth are obtained, and the influence of scour depth on the failure probability of pile foundation is analyzed. The results show that with the increase of scour depth, the failure probability of bridge pile foundation increases significantly under earthquake action.
【作者单位】：同济大学地下建筑与工程系;同济大学数学系;
【基金】：国家自然科学基金重大研究计划集成项目(91315301-05) 中央高校基金科研业务费专项资金
【分类号】：U442.55;U443.15

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