基于新型梁柱节点的装配式RCS组合框架结构抗连续倒塌性能研究

The assembled composite frame structure consisted of the precast reinforced concrete columns and steel beams is referred to as assembled RCS composite frame structure, which has the benefit of low cost and high efficiency. Meanwhile, this kind of structure adapts the industrialization development trend of building and subsequently has a broad application prospect. At present, the research on the performance of assembled RCS composite frame structure to resist progressive collapse is very limited. Due to the individual performances of this structure, the progressive collapse behavior of RCS composite frame structure is different from that of cast-in-place concrete frame structure or steel frame structure. The rotational stiffness and plastic deformation capacity of the beam-to-column joints are the key factors affecting the performance of the RCS composite frame structure. Two creative kinds of beam-to-column joints of RCS composite frame structure will be presented in this study, also the mechanical model of these joints to resist progressive collapse will be established. Compared with the experimental study and numerical simulation, the progressive collapse performance of the assembled RCS composite frame structure will be obtained. Some parameters such as the mechanical behavior of the beam-to-column joint, column failure location, floor number and beam span number, which affect the performance of progressive collapse of the assembled RCS composite frame structure, will be analysed. And then the progressive collapse mode and resistance mechanism will be reached. Finally, the performance and characteristics of resisting progressive collapse will be revealed and the corresponding progressive collapse design methods will be proposed.

装配式钢筋混凝土柱(Reinforced Concrete Column)—钢梁(Steel Beam)组合框架结构，简称“装配式RCS组合框架结构”，是一种低成本、高效率的结构形式，符合建筑工业化发展趋势，应用前景广阔。目前对装配式RCS组合框架结构抗连续倒塌性能的研究还非常有限。装配式RCS组合框架结构因其特殊的结构形式，其结构连续倒塌行为有别于现浇混凝土框架结构或纯钢框架结构。梁柱节点转动刚度和塑性变形能力是影响装配式RCS组合框架抗连续倒塌性能的关键。本项目拟研发2种新型RCS组合节点并建立其抗连续倒塌力学模型，开展装配式RCS组合框架结构连续倒塌性能的试验研究和数值模拟分析，研究梁柱节点力学性能参数、柱失效位置、层数、跨数等参数对装配式RCS组合框架结构抗连续倒塌性能的影响规律，分析其连续倒塌破坏模式和抗力机制，揭示其抗连续倒塌性能和特点，提出其抗连续倒塌设计方法。

装配式钢筋混凝土柱(Reinforced Concrete Column)—钢梁(Steel Beam)组合框架结构，简称“装配式RCS组合框架结构”，是一种低成本、高效率的结构形式，符合建筑工业化发展趋势，应用前景广阔。目前对装配式RCS组合框架结构抗连续倒塌性能的研究还非常有限。装配式RCS组合框架结构因其特殊的结构形式，其结构连续倒塌行为有别于现浇混凝土框架结构或纯钢框架结构。梁柱节点转动刚度和塑性变形能力是影响装配式RCS组合框架抗连续倒塌性能的关键。本项目主要研究内容包括：1）针对装配式RCS组合框架结构，提出了5种不同构造的梁柱连接节点，并对这5种节点的抗连续倒塌力学性能进行了试验研究和数值模拟，分析了其连续倒塌破坏模式和抗力机制。2）完成了2个1/2比例、2层1×2跨的装配式RCS组合框架结构（空间框架）抗连续倒塌性能的试验研究和数值模拟。3）开展了装配式RCS组合框架结构抗连续倒塌性能参数分析，考察梁柱节点转动刚度、柱失效位置、抗震设防烈度、层数、跨数等参数对结构抗连续倒塌性能的影响规律，揭示其抗连续倒塌性能和特点。4）基于试验研究和理论分析，提出了装配式RCS组合框架结构抗连续倒塌设计方法。5）对其中3种节点的抗震性能进行了试验研究和数值模拟。