砌体结构抗倒塌能力的分析方法研究

发布时间：2019-03-22 11:50

【摘要】：普通砌体结构在使用过程中可能会因为施工、环境或者意外等因素导致结构某片墙体突然失效而退出工作,对剩余结构造成未知的安全隐患甚至发生倒塌,因此砌体结构的抗倒塌设计在设计与加固中就显得非常重要。本文采用SAP2000设计软件对砌体结构的抗倒塌能力进行Pushover分析。限于砌体结构的复杂性,SAP2000设计软件只能够对砌体结构的弹性阶段进行分析,目前还无法对真实的砌体结构进行弹塑性分析,而对于框架结构,SAP2000的弹塑性分析较为成熟,本文第一部分工作是研究普通砌体结构转换成等代框架结构模型。等代的理论基础为刚度等代,包括三个方面：轴向刚度、剪切刚度和弯曲刚度。普通砌体结构等代成框架结构后,本文采用SAP2000设计软件建立完整砌体结构模型并与等代框架模型进行了弹性阶段位移和前三阶的振型周期对比。通过对比结果来看,可以确定选择框架等代模型是比较准确和合理的。本文第二部分工作是选择美国公共事务管理局的抗倒塌设计指南GSA2003中的拆除构件方法进行普通砌体结构抗倒塌能力的Pushover分析。考虑本文选用的结构布置形式,确定计算模型拆除构件为角墙、外纵墙中墙、内横墙中墙三种。通过拆除墙体的Pushover分析,发现针对本文选用的工程案例,在给定地震荷载作用下,塑性铰集中出现在首层和第二层,三到六层出现数量较少。首层与第二层的塑性铰进入屈服的大多出现在四个角墙、外墙和拆除墙体的周围墙体。通过拆除墙体分析,能够得到砌体结构不同位置墙体的重要程度和倒塌顺序。此分析成果对在普通砌体结构设计和加固时,判断和重视关键部位墙体与最先倒塌墙体有重要指导意义。
[Abstract]:The ordinary masonry structure may withdraw from work due to the sudden failure of a wall due to construction, environment or accident in the course of use, which may cause unknown safety hidden danger or even collapse of the remaining structure. Therefore, anti-collapse design of masonry structure is very important in design and reinforcement. In this paper, SAP2000 software is used to analyze the collapse resistance of masonry structures by Pushover. Because of the complexity of masonry structure, SAP2000 design software can only analyze the elastic stage of masonry structure. At present, the elastic-plastic analysis of real masonry structure can not be carried out. However, for frame structure, the elastic-plastic analysis of SAP2000 is more mature. The first part of this paper is to study the transformation of ordinary masonry structure into equivalent frame structure model. The theoretical foundation of the equivalent generation is stiffness equivalent, which includes three aspects: axial stiffness, shear stiffness and bending stiffness. After the ordinary masonry structure is replaced into a frame structure, the complete masonry structure model is established by using SAP2000 design software and compared with the elastic stage displacement and the first three modal periods of the equivalent frame model. Through the comparison of the results, we can determine the choice of frame and other generation model is more accurate and reasonable. The second part of this paper is to select the method of demolishing members in the American Public Affairs Administration's Design Guide for collapse Resistance (GSA2003) to carry out the Pushover analysis of the collapse resistance of ordinary masonry structures. Considering the layout of the structure selected in this paper, it is determined that the removed components of the calculation model are corner wall, middle wall of outer longitudinal wall and middle wall of inner and transverse wall. Through the Pushover analysis of the demolition of the wall, it is found that under the given earthquake load, the plastic hinges are concentrated in the first and second floors, and the number of three to six floors is relatively small in view of the engineering cases selected in this paper. Most of the plastic hinges of the first and second floors yield in the four corner walls, the exterior walls and the surrounding walls that remove the walls. Through the analysis of wall demolition, the importance and collapse order of masonry wall in different positions can be obtained. The results of this analysis have important guiding significance for judging and paying attention to the wall in the key position and the first collapsed wall in the design and strengthening of ordinary masonry structure.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU364;TU312.3

【相似文献】