【摘要】 根据模型试验数据确定各变形阶段框架的实际抗侧刚度,采用框架抗推刚度退化系数对框架各楼层抗推刚度进行修正,再引入周期、剪力与侧移修正系数对弹性阶段的结构受力性能予以修正,提出一种考虑刚度退化时框架结构的计算方法,并给出具体计算步骤.以8层框架为例,探讨了抗侧刚度退化对结构受力性能的影响.结果表明:考虑结构的刚度退化,结构自振周期增大,楼层剪力减少,侧移增加,符合工程实际,且概念清晰,简单适用,能为现行规范的补充与完善提供参考.更多还原

【Abstract】 The real stiffness of frame in different deformation phases was determined according to experimental data,and the stiffness degradation coefficient was adopted to revise the stiffness of each floor.By using the stiffness degradation coefficients of free vibration period,shear and lateral displacement,the structural behaviors were revised.A practical method for calculating the behaviors of frame structures considering the structural stiffness degradation was presented,and the calculation steps were given.An 8 storey frame was taken for the example,and the influence on the behaviors of the stiffness degradation was studied.It was shown from the example that the structural free vibration period increased,the structural shear of floor decreased,and the lateral displacement increased,if the stiffness degradation was considered.It accorded with engineering practice and its concept was clear,simple and suitable.The work of this paper will be helpful to the complementarities and consummate of the existing design codes.更多还原