| 结构抗震鲁棒性分析方法研究 |
| |
| 引用本文： | 包超,杜永峰,刘勇,徐天妮,王国福.结构抗震鲁棒性分析方法研究[J].西北地震学报,2015,37(3):660-666. |
| |
| 作者姓名： | 包超 杜永峰 刘勇 徐天妮 王国福 |
| |
| 作者单位： | 兰州理工大学防震减灾研究所, 甘肃兰州 730050;兰州理工大学防震减灾研究所, 甘肃兰州 730050;兰州理工大学西部土木工程防灾减灾教育部工程研究中心, 甘肃兰州 730050;兰州理工大学防震减灾研究所, 甘肃兰州 730050;兰州理工大学防震减灾研究所, 甘肃兰州 730050;兰州理工大学防震减灾研究所, 甘肃兰州 730050 |
| |
| 基金项目： | 国家自然科学基金(51178211) |
| |
| 摘 要： | 结合侧向增量连续倒塌过程中框架结构受力特征来研究结构抗震鲁棒性,提出其定量计算方法,通过对钢筋混凝土框架结构有限元模型的对比分析进行验证。研究表明:结构鲁棒性强弱是一个相对概念,虽然无法设计和建造出绝对鲁棒的结构,但可以通过定量分析结构鲁棒性进行建筑选型和结构布置方案优化;降低重要构件的易损性系数能够增强结构抗震鲁棒性,合理增加构件数量,同时加强其相互联系的有效性并保证备用荷载路径的可靠性,能够提高整体结构的鲁棒性;在同样荷载作用下,随着所承担荷载的不同,框架柱易损性系数按照大小排序依次为中柱、边柱和角柱,而由于备用荷载路径分布和传递荷载的机制不同,框架柱重要性按照大小排序则依次为角柱、边柱和中柱,对易损性系数和重要性系数均较大的构件设置可靠保护或增加荷载传递路径都能够提高整体结构抗连续倒塌的鲁棒性;提高结构冗余度,增强构件相互联系,可以降低结构中初始失效所造成的不利影响。
|
| 关 键 词： | 框架结构 连续倒塌 结构鲁棒性 构件易损性系数 构件重要性系数 |
| 收稿时间： | 2014/6/30 0:00:00 |
Study on Seismic Robustness of Structure |
| |
| BAO Chao,DU Yong-feng,LIU Yong,XU Tian-ni and WANG Guo-fu.Study on Seismic Robustness of Structure[J].Northwestern Seismological Journal,2015,37(3):660-666. |
| |
| Authors: | BAO Chao DU Yong-feng LIU Yong XU Tian-ni and WANG Guo-fu |
| |
| Institution: | Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology, Lanzhou 730050, Gansu, China;Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology, Lanzhou 730050, Gansu, China;Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, Gansu, China;Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology, Lanzhou 730050, Gansu, China;Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology, Lanzhou 730050, Gansu, China;Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology, Lanzhou 730050, Gansu, China |
| |
| Abstract: | In the last decade because of the frequent occurrence and great harm brought by the progressive collapse of structures, this problem has attracted increasing attention in the engineering field and has become a hot research issue worldwide. Progressive collapse is defined as a situation where the local failure of a primary structural component leads to the collapse of the whole structure. A safe and robust structure is able to bear the required loads to prevent complete collapse. Researchers have suggested a number of ways to ensure that buildings of significant size can absorb local damage and resist progressive collapse. However, the source and magnitude of the loads may differ, so it is impossible to design and construct structures that can guarantee absolute safety. Although much work has been done in the field of structural robustness, the term used for structural property prevents progressive structural collapse and is still in the exploration stage. So far, there is no clear definition or accepted parameters to quantitatively evaluate structural robustness. In this study, we describe the progressive-collapse resistance robustness of a frame structure and propose a target-oriented component vulnerability coefficient in combination with an internal force feature of the frame structure during the collapse process. Additionally, we improve an existing structural robustness coefficient. Furthermore, we verified the practicability of our proposed method by computing a finite element model of a reinforced concrete frame structure using the finite element analysis software, SeismoStruct V6.5. Our results show that structural robustness is relative and can be enhanced by reducing the member vulnerability coefficient of important columns. Under the same load, the vulnerability coefficient of the frame columns can be segregated as the middle, side, and corner columns, and the member importance coefficients have the opposite values. Components with large vulnerability and important coefficients should be protected to ensure structural robustness. |
| |
| Keywords: | frame structure progressive collapse structural robustness vulnerability coefficient of member importance coefficient of member |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《西北地震学报》浏览原始摘要信息 |
| 点击此处可从《西北地震学报》下载免费的PDF全文 |
|
