钢框架-支撑结构二阶侧移的分析方法  

ANALYSIS METHODS FOR SECOND-ORDER DRIFT OF BRACE-STEEL FRAME STRUCTURE

作　　者：金路[1] 马云思 刘丹[2] JIN Lu;MA Yun-si;LIU Dan(School of Civil Engineering, Shenyang Jianzhu University, Shenyang, Liaoning 110168, China;China Construction Eighth Engineering Division General Contracting Company Ltd. Shanghai 200135, China)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]中国建筑第八工程局有限公司总承包公司,上海200135

出　　处：《工程力学》2019年第B06期194-198,216,共6页Engineering Mechanics

基　　金：国家自然科学基金项目(51208314);辽宁省“兴辽英才计划”项目(XLYC1807188)

摘　　要：现阶段钢结构直接分析设计法大多基于承载能力极限状态的全过程直接分析,针对侧移刚度较小的多高层钢结构按此方法设计时,验算其整体柱顶侧移大多超过规范限值的要求。因此,若采用一种基于变形性能的直接分析法,首先对结构二阶侧移预判,再按此荷载水平进行承载力极限状态的验算,可得最终结果与传统计算方法一致,从而简化设计步骤和过程。该文介绍了考虑随机初始几何缺陷数值模拟、拟合公式和神经网络预测3种分析钢框架-支撑结构二阶侧移的方法,3种方法均可得到可靠的预测结果。通过以上方法对结构进行二阶侧移预判后,与规范要求的限值进行比较,选择合理的直接分析设计方法,进行有效简便的结构设计。Nowadays,direct analysis design method is the whole process of a direct analysis based on the ultimate limit state.When the multi-story steel structures design uses this method,checking its lateral deflections of a column are over standard requirements.Therefore,if it uses the direct analysis design method based on the deformation performance of a structure,you should predict the second-order drift of the structure at first then checking the ultimate limit state.The final result is consistent with the traditional result.Thusly,it can simplify design steps and process.The article introduces three methods of the second-order drift of a brace-steel frame structure,numerical simulation considered random defects,fitting formula and neural network.All of the methods could obtain reliable prediction results.After the second-order lateral shift prediction of a structure by the above method,the reasonable limit analysis design method is selected to compare the limit requirements of the specification,and effective and simple structural design is carried out.

关 键 词：直接分析法 钢框架-支撑结构 二阶侧移 蒙特卡罗法 神经网络 

分 类 号：TU391[建筑科学—结构工程]