卵形消化池-桩-土相互作用地震反应分析
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摘要
本文对卵形消化池-桩-土相互作用进行地震反应分析。从分枝模态——二步分析法的基本概念入手,将卵形消化池简化为振动特性和实际结构相同的简化结构,求得上、下部结构之间的耦合项,将耦合项和地震动一起组成修正地震动,以此作为刚性地基上卵形消化池地震反应分析的地震输入,从而求得考虑相互作用影响的卵形消化池地震反应。计算结果表明,在罕遇地震作用下,虽然部分土体进入塑性,池体仍处于弹性工作阶段,并且考虑相互作用影响后得到的卵形消化池地震反应,无论是池体位移还是池壁内力均要小于不考虑相互作用的。本文为解决复杂的卵形消化池-桩-土相互作用问题提供了一种较为实用的分析方法。
The seismic response of egg-shaped digester-pile-soil interaction system is analyzed in this paper.Based on the concept of branched modes,two-step method,a simplified structure,which maintains original vibration characteristic of the egg-shaped digester,is created for calculating the coupled item between upper and lower parts of the interaction system.Then a corrected seismic record composed of the coupled item and the initial record,is used as an input seismic excitation for the seismic response analysis of the egg-shaped digester setting on rigid foundation to calculate the seismic response of the egg-shaped digester including the influence of interaction. The results demonstrate that the digester body is still in the elastic stage while part of soil has entered the plastic stage under seldom occurred earthquake. And the results considering the influence of interaction,such as displacement and internal force,are all less than that not considering the influence of interaction.This paper provides a practical solution for the complicated problem of egg-shaped digester-pile-soil interaction.
The seismic response of egg-shaped digester-pile-soil interaction system is analyzed in this paper.Based on the concept of branched modes,two-step method,a simplified structure,which maintains original vibration characteristic of the egg-shaped digester,is created for calculating the coupled item between upper and lower parts of the interaction system.Then a corrected seismic record composed of the coupled item and the initial record,is used as an input seismic excitation for the seismic response analysis of the egg-shaped digester setting on rigid foundation to calculate the seismic response of the egg-shaped digester including the influence of interaction. The results demonstrate that the digester body is still in the elastic stage while part of soil has entered the plastic stage under seldom occurred earthquake. And the results considering the influence of interaction,such as displacement and internal force,are all less than that not considering the influence of interaction.This paper provides a practical solution for the complicated problem of egg-shaped digester-pile-soil interaction.
引文
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[2]姜忻良,丁学成.桩土物理模型及结构-桩-土相互作用[J].振动工程学报,1993,6(2):143-152.
[3]姜忻良,白玉平,高海.无粘结预应力卵形消化池的受力分析及设计[J].特种结构,2005,2:19-22.
[4]王振宇,刘晶波.成层地基非线性波动问题人工边界与波动输入研究[J].岩石力学与工程学报,23(7):1169-1173.
[5]张祖强,李平昌.ANSYS有限元程序在结构工程领域的应用[J].四川建筑,2004,24(2):50-52.
[6]卫军,钱波,徐港.梁单元在钢框架分析中的若干问题探讨[C]//2004ANSYS中国用户论文集.
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