模块装配式内藏钢板-混凝土剪力墙尺寸效应与抗震机理研究

Nowadays, precast structural system has been the inevitable trend of the development of industrial building. The key aseismic technical issues of the modular precast steel-concrete shearwall structure are focused in this proposal. New modular precast steel-concrete shearwall members and corresponding precast structural system are firstly developed. Systematic experimental studies and nonlinear numerical analysis on single and assembled modular members of the new precast shearwall are then investigated in detail. Three different types of connecting structures among the modular precast shearwall members, namely basic connecting type, enhanced connecting type and energy-dissipation connecting type, are proposed. Geometric and physical size effects of the mechanical properties, such as carrying capacity, ductility, energy-dissipation performance, stiffness and its degradation processes of the precast shearwall, are comprehensive discussed based on experimental and numerical study. The yield, damage and failure mechanism of the modular shearwall member and its connecting structures among the members are also analyzed. The aseismic failure restoring mode and carrying capacity design formulas are researched and established. The cooperative work performance and aseismic mechanism of the developed modular precast steel-concrete shearwall structure are further investigated. Study on actual engineering cases is final conducted based on the research achievements. The results of this proposal will make up for lacks of the aseismic technologies of precast steel-concrete shearwall structure, and will provide theoretical reference and technical support for standard and industrial precast structural design.

装配式结构体系是我国建筑产业化发展的必然趋势，本项目针对装配式内藏钢板-混凝土剪力墙的抗震关键技术问题，研发模块化的内藏钢板-混凝土剪力墙构件及其装配式结构体系。系统地进行单一和组合模块下装配式内藏钢板-混凝土剪力墙构件及其结构的抗震性能试验和弹塑性数值模拟研究工作，提出基本型、加强型和耗能型三种组合模块剪力墙的连接构造方式，分析其承载力、延性、破坏位移角、滞回曲线、耗能性能、刚度及其退化过程的几何和物理尺寸效应，研究剪力墙模块及模块之间连接部位的屈服、损伤与破坏模式，揭示组合模块装配式剪力墙结构的协同工作性能及其抗震机理，建立装配式内藏钢板-混凝土剪力墙考虑几何、物理尺寸效应的地震损伤恢复力模型和承载力分析与设计计算公式，结合实际案例进行试点工程分析与设计。研究成果有助于弥补装配式内藏钢板-混凝土剪力墙抗震性能研究的不足，可为标准化、产业化的装配式结构设计提出理论参考和技术支撑。

模块化装配式内藏钢板-混凝土剪力墙的几何和物理尺寸效应规律、协同工作性能与抗震机理、损伤恢复力模型和承载力简化计算公式是目前装配式钢板剪力墙结构中尚需大力关注的重点问题。本项目围绕上述四个关键问题展开研究，通过对装配式内藏钢板-混凝土剪力墙单一模块和组合模块进行1/3缩尺试验及理论研究，揭示其力学特性与在地震荷载下的损伤机制和协同工作机理；对装配式内藏钢板-混凝土剪力墙进行有限元数值仿真参数分析，研究其几何、物理尺寸效应对剪力墙模块承载力、延性、破坏位移角、滞回曲线形状、耗能性能、刚度及其退化过程、损伤与破坏模式等的影响规律，通过统计回归分析建立剪力墙模块尺寸效应计算公式；结合实验与有限元数值仿真结果，建立装配式内藏钢板-混凝土剪力墙模块的地震损伤恢复力模型，提出其考虑几何、物理尺寸效应的抗震承载力简化力学模型与理论计算公式，并将所得到的简化力学模型应用于实际工程结构，检验其可行性与合理性；参考试验与数值仿真模拟中得到的模块化装配式内藏钢板-混凝土剪力墙破坏机理，给出了装配式剪力墙结构及构件的实用抗震设计方法与构造措施。研究成果对于弥补模块化装配式内藏钢板-混凝土剪力墙研究的不足、完善钢板剪力墙抗震设计具有重要的现实意义，新型的模块装配式内藏钢板-混凝土剪力墙也将在高层建筑结构设计中具有广泛应用前景。