基于截面最佳刚度分布钢框架结构抗震设计方法研究  

The Seismic Design Method Research of Steel Frame Structure Based on the Best Stiffness Distribution of Cross Section

作　　者：陈文文[1] 马剑[2] 裴星洙[1] 

机构地区：[1]江苏科技大学土木工程与建筑学院,江苏镇江212000 [2]江苏科技大学(张家港)船舶与建筑工程学院,江苏苏州215600

出　　处：《工程抗震与加固改造》2015年第6期110-118,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);江苏省高校自然科学研究项目(14KJB560006)

摘　　要：针对平面和竖向均规则、对称的钢框架结构,基于截面刚度最佳分布,提出一种抗震设计方法。首先,将钢框架结构简化为竖向悬臂杆,并设定其层间剪切变形角和弯曲变形角变化率在竖直方向上为定值,依据变形与内力的关系,确定截面刚度的最佳分布。其次,基于截面刚度最佳分布,通过分析截面刚度与截面尺寸之间的内在联系,确定计算单柱截面面积的方法 -比例法。为简化设计方法,借用6层、9层钢框架算例模型地震反应弹塑性时程分析结果,利用最小二乘法拟合确定钢框架柱截面面积和惯性矩最佳分布,并提出便于工程应用的抗震设计方法。然后,基于本文所提出的抗震设计方法建立10层算例模型,选取4条地震波对其进行地震响应弹塑性时程分析,结果表明各层弹性和塑性层间位移角分布均匀且符合抗震规范要求。最后,通过10层算例模型的层屈服剪力系数与最佳层屈服剪力系数的对比,验证了上述抗震设计方法的合理性与可行性。For steel frame structure which is regular and symmetrical in both horizontal and vertical directions,a kind of seismic design method is put forward based on the best sectional stiffness distribution. Firstly,in order to determine the best sectional stiffness distribution,the steel frame structure is simplified to the vertical cantilever member,and the inter-laminar shear deformation angle and bending deformation angle change rate are set as fixed value in the vertical direction. Secondly,a way named ratio method of calculating single column＇s cross-sectional area is figured out based on the best stiffness distribution. To simplify the design method,the best distribution of sectional area and inertia of column is calculated by using least square method with the help of the elastic-plastic time history analysis results of 6 and 9 storey models. Then,a kind of convenient seismic design method is offered,the 10 storey steel frame model is established according the method proposed here,and four seismic waves are used to do elastic-plastic time history analysis for it. The result shows that elastic and plastic displacement angle distribute evenly between each storey and meet the requirements of seismic code. At last,through comparing the yield shear coefficient and the best yield shear coefficient of each storey,the rationality and feasibility of the seismic design method above are proved.

关 键 词：防灾减灾及防护工程 抗震设计 理论分析 钢框架 刚度分布 面积分布 

分 类 号：TU352.11[建筑科学—结构工程] TU391