装配式组合结构具有承载力高、整体刚度大、施工效率高等优势，在工程建造中应用前景广阔。本论文针对装配式组合结构的发展需求，提出一种重力-侧力系统可分组合结构体系，对该结构体系的抗震性能展开研究，重点探讨了结构的受力机理、变形特征、破坏模式和数值模型，并提出了抗震损伤评估方法，取得的主要研究成果如下：（1）完成了3个大尺度体系力学性能试验。根据试验结果对比了新型结构体系与传统刚接组合框架结构体系抗震性能的差异，分析了结构在竖向荷载和水平滞回荷载作用下的受力机理、变形特征和破坏模式，通过需求谱法对两种结构体系进行了抗震性能评价，并对新型结构体系中的节点半刚性问题进行了初步探讨。（2）通过三维精细数值模型对重力-侧力系统可分组合结构体系的受力机理展开研究。在通用有限元程序MSC.MARC平台上建立了壳-实体混合模型，提出了考虑焊缝开裂问题的模拟方法，分析了体系中各构件的受力变形特征、屈曲形态和破坏模式。（3）建立了适用于重力-侧力系统可分组合结构体系的高效数值分析工具。基于组件法的基本思想提出了适用于该结构体系的半刚性节点模型，基于通用有限元程序MSC.MARC平台的二次开发功能实现了高效、准确、便捷的半刚性节点单元，对组合结构非线性分析子程序包COMPONA-FIBER纤维梁模型进行扩展，形成适用于该结构体系的高效分析工具。（4）利用高效数值工具研究了重力-侧力系统可分组合结构体系在地震作用下的滞回行为。以某实际六层办公楼结构为例，开展弹塑性时程分析，研究了新型结构体系的抗震机理以及节点半刚性作用对体系抗震性能的影响。（5）建立了适用于重力-侧力系统可分组合结构体系的抗震损伤评估方法。结合新型结构体系在地震作用下损伤特征，选取楼层曲率作为其抗震损伤评估指标，基于截面分析方法确定了组合剪力墙的关键损伤临界状态，探讨了结构关键参数对体系抗震损伤行为的影响机制。本论文获得国家重点研发计划(2017YFC0703804)和国家自然科学基金重大项目课题(51890903)资助。
The prefabricated composite structures have the advantages of high bearing capacity, high overall stiffness and high construction efficiency, which have a broad application prospect in engineering construction. In this thesis, a new composite structural system with separated gravity and lateral resisting systems is proposed to meet the development needs of prefabricated composite structures. The seismic behavior of this structural system is investigated, focusing on the force mechanism, deformation characteristics, failure mode and numerical model, and the seismic damage assessment method of the structural system is proposed. The main research works and results are as follows:(1) Three large scale tests on the mechanical performance of the structural system are completed. Based on the test results, the differences in seismic behavior between the new structural system and the traditional rigid composite frame are compared. The force mechanism, deformation characteristics and damage patterns under vertical floor loading and horizontal cyclic loading are analyzed, respectively. The seismic performance of the two structural systems are evaluated by the demand spectrum method, and the semi-rigidity of the connections in the new structural system is initially discussed.(2) The mechanism of the composite structural system with separated gravity and lateral resisting systems is investigated using the three-dimensional fine element model. A shell-solid mixed model is established on the general FE package MSC.MARC, and a simulation method considering the weld fracture problem is proposed. The force and deformation characteristics, buckling patterns and failure modes of different components in the new structural system are analyzed.(3) An efficient numerial model of the composite structural system with separated gravity and lateral resisting systems is established. An analytical model of the semi-rigid connections in the new structural system is proposed based on the basic idea of component method. A connection element is realized based on the secondary development function of the general FE package MSC.MARC, which forms an efficient analysis model for the new structural system by extending the subroutine package for the nonlinear analysis of composite structures COMPONA-FIBER.(4) The hysteresis behavior of the composite structural system with separated gravity and lateral resisting systems under seismic action is studied through the application of the self-developed numerial model. Elasto-plastic history analysis is carried out on a six-story office building to investigate the seismic mechanism of the new structural system and the effect of semi-rigidity of connections on the seismic behavior of the overall structure.(5) A seismic damage assessment method is established for the composite structural system with separated gravity and lateral resisting systems. Considering the damage characteristics of the new structural system under seismic action, the story curvature is selected as the seismic damage assessment index. The critical damage states of the composite shear wall are determined based on the cross-sectional analysis method. Based on the seismic damage assessment method, the influence mechanism of the key structural parameters on the seismic damage behavior of the structural system is discussed.This dissertation is sponsored by National Key Research Program of China (2017YFC0703804) and National Natural Science Foundation of China Program (51890903).
