带悬挑外廊单跨框架结构抗震加固方法研究

发布时间：2018-01-19 15:30

本文关键词： 单跨框架抗震加固弹性反应谱分析静力弹塑性分析　出处：《华中科技大学》2013年硕士论文　论文类型：学位论文

【摘要】：既有建筑物的抗震加固设计拥有广泛的应用前景，选择合理的结构体系加固方案是抗震加固设计的重点。本文研究的方向在于努力获得较好的关于带悬挑外廊式单跨框架结构的抗震加固方法，为此类既有建筑物提供较好的抗震加固设计方案。本文首先介绍了现有框架结构的主要形式，结合我国历次地震中框架结构的震害情况，总结了框架结构的主要震害特征，并分析了震害产生的原因。对带悬挑外廊单跨框架结构进行弹性反应谱分析和静力弹塑性分析，，带悬挑外廊单跨框架结构冗余度少，在大震作用下楼层侧移较大，结构塑性铰发展较快，较早形成机构，易倒塌。针对以上结构薄弱环节，提出增设框架柱和增设剪力墙的结构体系加固方案，并分别进行了弹性反应谱分析和静力弹塑性分析，两种结构体系加固方案均能够起到改善抗震性能和提高抗倒塌能力的作用。本文主要分析结论如下：增设框架柱加固方案增加了结构冗余度，提高了结构抗侧刚度，在大震作用下，塑性铰发展缓慢，形成较好的“梁铰机制”，结构抗震性能和抗倒塌能力都相应提高；Y向增设剪力墙加固方案使结构Y向刚度显著增加，侧移减小，仅梁端出现塑性铰，且发展缓慢，最终没有形成机制，有效起到改善抗震性能和提高抗倒塌能力的作用，但其对结构X向抗震性能并没有起到改善作用。
[Abstract]:The seismic reinforcement design of existing buildings has a wide application prospect. It is the focal point of aseismic reinforcement design to select a reasonable structural system strengthening scheme. The research direction of this paper is to obtain a better seismic reinforcement method for single-span frame structure with cantilever outerpass. To provide a better seismic reinforcement design scheme for this kind of existing buildings. This paper first introduces the main forms of the existing frame structure, combined with the earthquake damage of the frame structure in previous earthquakes in China, summarizes the main damage characteristics of the frame structure. The elastic response spectrum analysis and static elastic-plastic analysis of single-span frame structure with overhanging veranda are carried out, and the redundant degree of single-span frame structure with overhanging veranda is less. Under the action of strong earthquake, the floor is larger, the plastic hinge of the structure develops rapidly, the mechanism is formed earlier and the structure collapses easily. In view of the weak link of the above structure, the reinforcement scheme of the structural system with the addition of the frame column and the additional shear wall is put forward. The elastic response spectrum analysis and the static elastoplastic analysis are carried out respectively. The two strengthening schemes can improve the seismic performance and the ability to resist collapse. The main conclusions of this paper are as follows: the addition of frame column reinforcement scheme increases the redundancy of the structure and improves the lateral stiffness of the structure. Under the action of strong earthquake, the plastic hinge develops slowly and forms a better "beam hinge mechanism". The seismic performance and collapse resistance of the structure are improved accordingly. The Y direction shear wall reinforcement scheme can significantly increase the Y direction stiffness of the structure, decrease the lateral displacement, only the plastic hinge appears at the end of the beam, and the development is slow, and there is no formation mechanism at the end. It can effectively improve the seismic performance and the anti-collapse ability, but it does not improve the X-direction seismic performance of the structure.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU352.11

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