基于刚度退化的框-剪结构受力性能研究

根据模型试验数据确定各变形阶段框架与剪力墙的实际刚度,针对4种典型工况,分别采用框架与剪力墙刚度退化系数计算刚度退化后的各楼层刚度,再沿结构高度方向加权平均得到结构真实刚度。基于协同工作原理提出一种考虑结构刚度退化计算框-剪结构的适用方法,通过算例分析了结构的受力性能。研究结果表明:考虑结构刚度退化后,结构自振周期增加,刚度减少,侧移增大,总框架承担总剪力的比例增加,《规范》对框架承担剪力的调整是有必要的。

Research on behaviors of frame-shear wall structures based on stiffness degradation

The real stiffness of frames and walls in different deformation phases is determined according to the experimental data.Using the different stiffness degradation coefficients of frames and walls,each floor stiffness can be calculated under four typical conditions,and the structural really stiffness can be obtained from the average of floor stiffness along the structural height.A practical method of calculating the behavior of frame-shear wall structures considering the structural stiffness degradation is presented based on the principal of corporation action and the structural behavior are calculated through an example.It is shown that considering the structural stiffness degradation,structural free vibration period increases,structural stiffness decreases,lateral displacement increases and the rate of total frames bearing total shear increases,and it is necessary that the shear frames should be adjusted.