工程结构连续倒塌破坏及性能提升技术研究现状

Research Status on Progressive Collapse of Engineering Structure and Performance Improvement Method

工程结构局部破坏引起整体失效的连续倒塌会造成严重的社会危害,且连续倒塌问题的不确定性使得整个结构的临界状态异常复杂。已有众多学者对工程结构连续倒塌问题展开大量研究,笔者对国内外工程结构连续倒塌性能的试验研究、数值模拟和理论分析成果进行了总结,包括:归纳了不同结构形式如钢筋混凝土框架结构、板柱结构、组合结构和预制装配式结构的连续倒塌机理、影响因素、理论分析等方面的主要研究;总结了梁柱和梁板结构受力全过程计算模型等倒塌抗力计算模型的理论研究现状,指出了目前计算模型的不足;总结了采用加固方式提升抗连续倒塌性能的方法,并且从增强抗弯性能、压拱效应、悬链线效应、拉压膜效应以及改变受力体系方面分析不同加固方式对连续倒塌破坏机制的影响。在现有研究的基础上分析了目前研究的不足以及对后续研究方向进行了展望。

The progressive collapse of the whole structure caused by partial damage of the engineering structure causes serious social harm, and the uncertainty of the progressive collapse problem makes the critical state of the whole structure extremely complicated. Many scholars have carried out a lot of research on the progressive collapse of engineering structures. The experimental research, numerical simulation and theoretical analysis results of progressive collapse performance of engineering structures at home and abroad were summarized, including: the main research on progressive collapse mechanism, influencing factors and theoretical analysis of different structural forms such as reinforced concrete frame structure, slab-column structure, composite structure and prefabricated structure. The theoretical research status of collapse resistance calculation models such as the whole process calculation model of beam-column and beam-plate structures was summarized, and the shortcomings of the current calculation models were pointed out. The methods to improve the progressive collapse resistance by reinforcement methods were summarized, and the effects of different reinforcement methods on the progressive collapse failure mechanism were analyzed from the aspects of strengthening the flexural performance, arching effect, catenary effect, tensile and compressive membrane effect and changing the stress system. Based on the existing research, the shortcomings of the current research were analyzed and the future research directions were prospected.