基于整体效能的不等跨钢框架抗倒塌冗余设计  

Redundancy design for collapse resistance of steel frame with unequal span based on overall efficiency

作　　者：郑玉辉 钟炜辉[1,2] 谭政 孟宝 段仕超[1] 宋晓燕 ZHENG Yuhui;ZHONG Weihui;TAN Zheng;MENG Bao;DUAN Shichao;SONG Xiaoyan(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055

出　　处：《建筑结构学报》2023年第2期86-99,共14页Journal of Building Structures

基　　金：国家自然科学基金面上项目(52178162);陕西省重点研发计划项目(2018ZDXM-SF-097);陕西省教育厅重点科学研究计划(协同创新中心项目,20JY033)。

摘　　要：双跨梁的变形协调设计可使不等跨结构的抗倒塌效能得到充分发挥,以顶底角钢腹板双角钢(TSDWA)连接的不等跨钢框架结构为例,对冗余设计的具体方法展开研究。通过对两个1/3缩尺的两跨TSDWA连接组合梁柱子结构进行拟静力试验研究,对比等跨试件与不等跨试件传力机理的差异,明确不等跨子结构承载力以及变形发展的控制参数。以此为基础,将设计需求转换为关键连接部件的性能设计,并给出具体设计方法。通过数值模型对冗余设计的作用机理进行验证,分析设计前后子结构受力行为的差异。结果表明:冗余设计对子结构的刚度与塑性承载力影响较小,主要提升了子结构的整体变形能力与大变形阶段的承载力,拓展了梁机制与悬索机制的发挥空间;经设计后模型双跨梁的变形协同系数均不低于0.9,明显高于原结构的;子结构达到双跨梁同时破坏的理想状态,可以使不等跨子结构的整体效能得以充分发挥。The deformation coordination design of two-bay beams can make full use of the anti-collapse efficiency of structures with unequal span. The specific method of redundancy design was studied by taking a steel frame structure with unequal spans connected by top-seat angle with double web angle(TSDWA) connection as an example. Firstly, the specimens with equal and unequal spans were compared, and the controlling parameter of bearing capacity and deformation of substructure with unequal span was clarified through the quasi-static experimental study of two 1/3 scale composite beam-column structures with TSDWA connections. On this basis, the design requirements were transformed into the performance design of key connecting parts, and the specific design method was given. The mechanism of substructures through redundant design was verified and analyzed by the numerical model. The results show that the redundant design has little effect on the stiffness and plastic bearing capacity of the substructures, and mainly improve the overall deformation capacity of the substructures and the bearing capacity in the large deformation stage. The exertion space of flexural and catenary actions are expanded. After the design, the deformation coordination coefficients of the two-bay beams are not less than 0.9, which is significantly higher than that of the original structure. Since the two-bay beams is close to the ideal state of simultaneous failure, the overall efficiency of the substructure with unequal spans can be brought into full play.

关 键 词：不等跨钢框架 顶底角钢腹板双角钢连接 拟静力试验 变形协调 整体效能 抗倒塌冗余设计 

分 类 号：TU391[建筑科学—结构工程]