摘要
以多高层钢框架结构在地震作用下的层间剪切变形角和弯曲变形角变化率为目标,探讨多高层钢框架结构截面最佳剪切和弯曲刚度分布。将建筑结构简化为竖向悬臂杆,地震作用简化为倒三角形分布荷载。设定悬臂杆沿高度方向层间剪切变形角和弯曲变形角变化率处处相等,反算出悬臂杆截面剪切和弯曲刚度分布,并定义为截面优化剪切和弯曲刚度分布。建立6层钢框架结构算例模型试算,依据截面优化刚度分布公式确定各层的剪切刚度和弯曲刚度;进行弹性时程分析,计算各层的剪切变形角和弯曲变形角变化率;并对刚度进行修正,修正后的截面刚度分布定义为截面最佳刚度分布,验证截面最佳刚度分布理论的合理性。
Aiming at inter-laminar shear angle and bending angle change rate of multi-storey steel frame structure under seismic action, the best shear and bending stiffness distribution of the structure section are studied. The building structure is simplified to the vertical cantilever member, and seismic action is simplified to inverted triangular distributed load. In order to calculate section shear and bending stiffness distribution, which are defined as the optimal section shear and bending stiffness distribution, the values of inter- laminar shear deformation angle and bending deformation angle change rate are set equal everywhere in height direction of cantilever member. Then a 6-story steel frame structure model is established, the section shear stiffness and bending stiffness for every story are obtained according to the formula of optimal stiffness distribution. The elastic time history analysis method is applied to study inter- laminar shear deformation angle and bending deformation angle change rate, the section stiffness distribution needs to be adjusted, and the adjusted stiffness distribution is defined as the best stiffness distribution. Finally, the best stiffness distribution is proved to be reasonable.
出处
《工程抗震与加固改造》
北大核心
2014年第4期1-9,共9页
Earthquake Resistant Engineering and Retrofitting
基金
江苏省研究生科研创新计划项目(CXLX13_710)
江苏科技大学研究生科技创新计划项目(12508030054)
关键词
框架结构
截面最佳剪切刚度
截面最佳弯曲刚度
剪切变形角
弯曲变形角变化率
刚度分布
frame structure
optimal section shear stiffness
optimal section bending stiffness
shear angle
bending angle change rate
stiffness distribution
