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The Anti-earthquake Study of a New Steel Seismic Isolation Layer

Author: NiTao
Tutor: WuFangBo
School: Hunan University
Course: Structural Engineering
Keywords: Structure with a steel seismic isolation layer Mode analysis of large deformation and prestress Displacement limiting device of flexible collision Transient analysis
CLC: TU352.12
Type: Master's thesis
Year: 2010
Downloads: 35
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Abstract

There was continuously occurred several much serious earthquake natural disaster all over the world in recent years,which created enormous damages to the life and property of people. Every country begin to search a new anti-earthquake method and an indirect method of seismic isolation is attached importance by people more and more,moreover,to be a trend. Based on the present theories and the application results,using combined isolation rubber bearing may be a more mature seismic isolation method, but there are still many problems to be solved during its application.This paper hopes to perfect the previous deficiency on the basis of the study of a new steel seismic isolator and continue to do a theoretical analysis of earthquake resistance more on the seismic isolation structure.This paper firstly makes a mode analysis of large deformation and prestress on a structure model of six floors with a steel seismic isolation layer,which is about the effect on the structure ringing frequency as a result of a second order effect caused by the convergence level large deformation of seismic isolation layer. It will be seen from that the second order effect may make an impact on the structure reaction while there is an earthquake. Moreover,we find a way of computing the real structure ringing frequency of the structure with a steel seismic isolation layer by ANSYS. and then the paper makes a transient analysis of horizontal earthquake that considers the combined action of gravity of superstructure on the structure with a steel seismic isolation layer,which is added a displacement limiting device of flexible collision. And also analyses the impact on the structure of earthquake resistance by every parameters of the displacement limiting device as an infrequence earthquake According to those, it discusses the possibility and result of the structure with a steel seismic isolation layer.At last, the paper makes an assumption and introduces the theory on the displacement limiting device of flexible collision.By the analysis and study of theory,I hope it can prepare for the farther studies and experiments of the seismic isolation structure.Of course, there are some points author does not consider in the thesis. So some prospects are given at the end of the thesis to prepare for the further study and some aspects are considered as following in the further study:1.The former analysis and simulation are just the simulating study at the theoretical stage. Analyzing and checking through experiments is a important task. And the seismic isolation effect of the structure with a steel seismic isolation layer must explained by the result of the experiment.2.The analysis of the dynamic time interval of the earthquake is just a analysis of the structure with steel seismic layer at the X axis. But the analysis of the structure when it encounters the multi-earthquake needs further analysis.3.How to realize the construction of the whole structure with a steel seismic isolation layer, such as the connecting construction between the upper structure and the seismic isolation layer, the settlement and fixation of the steel layer, the antirust of the steel and so on.

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CLC: > Industrial Technology > Building Science > Building structure > Special Structure > Anti - shock structure,disaster prevention structures > Shock, isolation, and explosion-proof structure > Isolated structure
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