摘要
目的分析次梁在框架结构中的抗连续倒塌性能,为抗连续倒塌设计和研究提供依据.方法采用有限元软件Sap2000对6个不同次梁布置形式(不考虑次梁、长边单向布置、短边单向布置、十字型布置、井字形布置、密肋型布置)的五层框架结构进行倒塌动力分析,同时笔者对其中5个模型(不考虑次梁除外)进行倒塌的敏感性分析和经济性分析.结果次梁密肋型布置的结构的位移和速度时程曲线斜率最小,其次是十字型和井字形.在长边中柱和角柱失效下,框架结构的连续倒塌发生的概率最大,在内柱失效下,连续倒塌发生的概率最小.长边布置形式的次梁的结构的总造价最小,十字型和井字形布置其次,最大的是密肋型布置.结论次梁有一定的抗倒塌作用,其中密肋型布置形式对抗倒塌最有利;框架结构对长边中柱和角柱失效下连续倒塌最敏感,对内柱失效下最不敏感;结合经济性和抗倒塌性因素考虑,框架结构的次梁布置形式应首选十字型和井字型.
The purpose of this paper is to study the performance of anti-progressive collapse of secondary beams in frame structures and to provide a reference for progressive collapse design and research. Using the finite element software-Sap 2000, for six different arrangement forms （the form without secondary beams;the long side one-way secondary beam arrangement form;the short side one-way secondary beam arrangement form;the cross secondary beam arrangement form;the well word secondary beam arrangement and the ribbed type secondary beam arrangement form） ,the performance analysis of anti-progressive collapse has been car- ried out. At the same time, the analysis of sensitivity and economical cost has been also made for the five ar- rangement forms （apart from the form without secondary beams）. It is found that the slope of displacement and speed time history curve in the ribbed type arrangement form is minimum;the followings are in the cross arrangement and the well word arrangement form. When the angle or long edge colunm is collapsed, the probability of frame structure progressive collapse is maximum; when the inner column is failed, the collapse probability is minimum. The total cost of the frame structure with the long side one-way arrangement form is minimum, the costs with the cross arrangement and well word arrangement form are following. The structure cost with the ribbed tvoe arrangement form is maximum. Conclusion shows that using the secondarv beams,the anti-progressive collapse performance of flame structure can be improved and the best form of anti-pro- gressive collapse is the ribbed type secondary beam arrangement. The most sensitive part of frame structure is the angle or long edge collapsed column and the inner collapsed column is the least sensitive part. Consider- ing anti-progressive collapse performance and cost of frame structure, the cross secondary beam arrangement form or the well word secondary beam arrangement form should be selected firstly.
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2014年第1期41-48,共8页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51168010)
