组合墙-柱式多层冷成型钢结构抗侧机理及简化分析方法研究

Cold-formed steel (CFS) structure has the advantages of energy conservation, environment protection and high degree of industrialization. Because of large population, the shortage of land resource, it is of great significance and more consistent with Chinese national conditions to develop CFS structure from low-rise buildings to mid-rise dwellings. In the present program, systematically investigation will be carried out on the lateral resistance mechanism and simplified analysis method of mid-rise CFS structure framed by shear-wall-columns. The present program mainly involves the following three parts: (1) Full-scale model tests are performed to study the shear behavior of shear-wall-column, and refined numerical simulation method on the shear performance of the component is investigated; based on the experimental and numerical results, the synergy mechanism of shear-wall-column is revealed. (2) Full-scale model test on the mechanical performance of beam-column joint which is the key component effecting the lateral performance of mid-rise CFS structure, is conducted to explore its bending mechanism, and a precise prediction model for the moment-rotation relationship of the joint is further established. (3) Research on the theoretical hysteretic model of shear-wall-column is carried out, and the simplified calculated method of the component is further proposed; in consideration of the mechanical properties of both shear-wall-column and joint, a simplified seismic analysis method of mid-rise CFS structure is ultimately established. The present program is devoted to solving the key problems in research and application of mid-rise CFS structures, and the proposed research results will provide the theoretical and technical support for promoting the application of mid-rise CFS dwellings in our country.

根据我国人多地少的基本国情，将节能环保、工业化程度高的冷成型钢结构从低层房屋发展到多层住宅具有重要意义。本项目拟系统开展组合墙-柱式多层冷成型钢结构的抗侧机理及简化分析方法研究。主要研究内容有：（1）通过足尺模型试验研究组合墙-柱抗侧构件的受剪力学行为及损伤破坏模式，并对其力学性能的精细化数值模拟方法展开研究，揭示组合墙-柱协同抗侧机理。（2）对影响多层冷成型钢结构抗侧性能的关键构件——梁柱节点开展足尺模型连接性能试验，探讨其受力机理，建立准确的节点弯矩-转角本构理论预测模型。（3）研究组合墙-柱理论受剪滞回模型，提出其简化计算方法，综合考虑组合墙-柱及节点的受力特性建立多层冷成型钢结构地震响应简化分析方法。本项目致力于解决多层冷成型钢结构研究与应用中的关键性基础问题，为促进多层冷成型钢住宅在我国的推广应用提供理论与技术支撑。

本项目针对冷成型钢结构由低层拓展到多层所面临的相关技术难点，通过构件改进，提出了能够满足多层冷成型钢结构要求的组合墙-柱协同抗侧构件和构造简单、易于施工的新型装配式冷成型钢梁柱连接节点，并对组合墙-柱式多层冷成型钢结构的抗侧机理及简化分析方法进行了研究。主要包括：（1）通过足尺模型试验，获得了组合墙-柱的受剪力学行为及损伤破坏模式，建立了能反应组合墙-柱抗剪性能的精细化数值仿真分析方法，揭示了组合墙-柱协同抗侧机理；（2）通过足尺模型试验，探讨了新型装配式冷成型钢梁柱节点的受力机理，提出了能反映梁柱节点连接非线性特性的弯矩-转角本构理论预测模型，为准确建立组合墙-柱式多层冷成型钢结构简化计算模型打下基础；（3）探索了组合墙-柱理论受剪滞回模型，并对现有的等代拉压杆模型进行改进，提出了组合墙-柱抗剪性能简化计算方法；在此基础上，综合考虑组合墙-柱及节点的受力特性，建立了多层冷成型钢结构地震响应简化分析方法。