基于拆除构件法的无楼板钢框架结构抗连续倒塌的关键杆件的判定方法与验证  

Determination Method and Verification of Key Members for Resisting Continuous Collapse of Slab Free Steel Frame Structure Based on Dismantling Component Method

作　　者：袁梓豪 陶忠[1,2] 赵龙岗 YUAN Zihao;TAO Zhong;ZHAO Longgang(Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650500,China;Yunnan Earthquake Engineering Research Institute,Kunming 650503,China)

机构地区：[1]昆明理工大学建筑工程学院,昆明650500 [2]云南省抗震技术研究中心,昆明650503

出　　处：《材料导报》2024年第S02期461-468,共8页Materials Reports

摘　　要：本工作聚焦于无楼板钢框架结构,采用拆除构件法,提出以梁端最大塑性转角作为关键杆件判定指标的方法。采用有限元软件MIDAS Gen建模,选取同济大学李国强研究中的2层4跨屏幕钢框架倒塌试验数据验证了该建模方法和分析方法的准确性和有效性。通过构建三个不同荷载工况和跨长条件下的平面钢框架模型,逐一拆除底层框架柱得到其失效柱处的竖向位移并计算最大梁端的转角,从而初步判断柱的重要性顺序,然后基于GSA(General Services Administration)指南中的规定分别对三个模型进行了线性静力分析和非线性动力分析,进一步验证底层框架柱的重要性顺序。分析结果表明:以最大梁端转角作为关键杆件判定指标的方法能准确判定底层框架柱的重要性顺序;线性静力分析法较非线性动力分析法结果偏保守;线性静力分析中弯矩DCR(Demand-capacity ratios)值是判断结构连续倒塌的关键指标,且荷载布置和结构跨度对关键杆件的判定有显著影响。This work focused on the steel frame structure without floor slabs,using the method of dismantling components,and proposes a method of using the maximum plastic rotation angle at the beam end as the key criterion for determining members.The modeling used the finite element software MIDAS Gen and selects the collapse test data of a 2-story 4-span screen steel frame from Li Guoqiang’s research at Tongji University to verify the accuracy and effectiveness of the modeling and analysis methods.By constructing a planar steel frame model under three different load conditions and span length conditions,the vertical displacement at the failure column of the bottom frame column was removed one by one,and the maximum beam end angle was calculated to preliminarily determine the importance order of the columns.Then based on the provisions of the General Services Administration(GSA)guidelines,linear static analysis and nonlinear dynamic analysis were conducted on the three models to further verify the importance order of the bottom frame columns.The analysis results indicate that the method of using the maximum beam end angle as the key component judgment index can accurately determine the importance order of the bottom frame columns;The results of linear static analysis method are more conservative than those of nonlinear dynamic analysis method;the Demand capacity ratios(DCR)value of bending moment in linear static analysis is a key indicator for determining the continuous collapse of structures,and the load arrangement and structural span have a significant impact on the determination of key members.

关 键 词：钢框架结构 连续倒塌 关键杆件 拆除构件法 线性静力分析 非线性动力分析 

分 类 号：TU391[建筑科学—结构工程]