偶然荷载作用下钢筋混凝土框架结构抗连续倒塌分析与设计

发布时间：2018-03-12 08:00

本文选题：连续倒塌　切入点：偶然荷载　出处：《南昌航空大学》2017年硕士论文　论文类型：学位论文

【摘要】：建筑结构的安全问题越来越引起社会的重视,欧美等国对结构抗倒塌问题较早就开展了研究,并颁布了针对结构抗连续倒塌设计的相应规范。而目前国内规范虽有部分涉及,但仍缺乏专业的抗连续设计规范。为开展国内规范设计下的结构抗连续倒塌研究,本文在总结国外抗连续倒塌规范的基础上,使用SAP2000工程软件,采用非线性动力拆除构件法对国内规范设计的结构做抗连续倒塌分析,并运用倒塌率指标对结构做出评价。本文比较研究中美两国荷载规范和结构设计体系的差异。提出适合的偶然荷载组合。并利用该荷载组合采用非线性静力替代路径法对结构重新进行抗倒塌设计,对比美国规范设计结果,得出修改后偶然荷载设计结果偏安全,适用于国内规范设计体系。主要研究结论如下:1、运用非线性动力替代路径法分析结构的抗倒塌性能,并引入倒塌率指标对结构进行评价。结构抗倒塌性能随楼层增加而降低,内柱冗余度较高倒塌率最低,长边中柱倒塌率最高。2、结构倒塌过程中,失效柱上部梁构件出现两种抗力机制,不同失效柱产生的抗力机制不同。3、对中美两国荷载规范体系的差异性做梳理,提出适合国内规范设计的偶然荷载组合,并运用该组合对结构进行抗倒塌设计,对比美国规范荷载组合有较高安全性。
[Abstract]:More and more attention has been paid to the safety of building structures. Some countries, such as Europe and America, have carried out research on the problem of structural collapse resistance earlier, and issued the corresponding codes for the continuous collapse design of structures. However, there is still a lack of professional anti-continuous design code. In order to carry out the research on the continuous collapse resistance of structures under the domestic code design, this paper uses SAP2000 engineering software on the basis of summing up the foreign anti-continuous collapse codes. The nonlinear dynamic demolition method is used to analyze the continuous collapse resistance of the structures designed by the domestic code. In this paper, the difference of load codes and structural design systems between China and the United States is compared and studied. A suitable combination of accidental loads is proposed, and the nonlinear static substitution is used in this combination. The path method is used to redesign the structure against collapse. Compared with the design results of American code, the result of modified accidental load design is relatively safe and suitable for domestic code design system. The main conclusions are as follows: 1. Nonlinear dynamic alternative path method is used to analyze the collapse resistance of structures. And the collapse rate index is introduced to evaluate the structure. The anti-collapse performance of the structure decreases with the increase of the floor, the highest collapse rate of the inner column is higher, the collapse rate of the column in the long side is the highest, the collapse rate of the long side column is the highest, and the collapse rate of the long side column is the highest. There are two kinds of resistance mechanisms in the upper beam member of failure column. The resistance mechanism of different failure column is different. The difference of load code system between China and the United States is combed out, and the accidental load combination suitable for the design of domestic code is put forward. The combination is used to design the collapse resistance of the structure, which is more safe than the American code.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU375.4

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