单根立柱失效条件下框架结构楼房动力响应特征研究  

Study on Dynamic Response Characteristics of Frame Structure Building with Single-column Failure

作　　者：侯永恒 姚颖康 余珊珊 黄小武[3] HOU Yong-heng;YAO Ying-kang;YU Shan-shan;HUANG Xiao-wu(State Key Laboratory of Precision Blasting,Jianghan University,Wuhan 430056,China;Hubei Key Laboratory of Blasting Engineering,Jianghan University,Wuhan 430056,China;Wuhan Explosions and Blasting Corporation Limited,Wuhan 430056,China)

机构地区：[1]江汉大学省部共建精细爆破国家重点实验室,武汉430056 [2]江汉大学爆破工程湖北省重点实验室,武汉430056 [3]武汉爆破有限公司,武汉430056

出　　处：《爆破》2023年第2期103-109,共7页Blasting

基　　金：武汉市知识创新专项基础研究项目(2022020801010371);湖北省自然科学基金创新群体项目(2020CFA043);湖北省重点研发计划项目(2020BCA084)。

摘　　要：高层框架结构楼房不同部位单根立柱失效条件下楼房的变形能力、加速度响应和荷载传递等动力响应特征是本研究的重点。首先,依据《混凝土结构设计规范》(GB50010),采用PKPM设计软件建立了一个4×6跨的8层钢筋混凝土框架结构模型;其次,基于构件拆除法,应用有限元软件SAP2000非线性动力分析方法计算了一楼中心柱、长边中柱、短边中柱、角柱等不同部位单根立柱失效条件下框架结构的动力响应特征。研究结果表明:四种立柱失效条件下,其塑性转角均小于6°,结构不会发生倒塌,中心立柱失效时结构稳定性最差,发生连续倒塌的概率相对最大,短边中柱和长边中柱次之,角柱概率最小;中心柱失效条件下楼房荷载对剩余结构的动力冲击作用影响最为显著,其负向最大值加速度大约是短边中柱和长边中柱的2倍,可达3 g左右;不同部位立柱失效后,荷载将重新分布,其轴力由紧邻的柱承担,而上方梁的受力形式也从受弯转变为受拉,发生悬链线效应,在中心柱失效工况下,相邻的各柱轴力增加了近20%。The dynamic response characteristics such as deformation capacity,acceleration,and load transfer of high-rise frame structure buildings under the condition of single column failure in different parts were studied.Firstly,according to the Code for Design of Concrete Structure(GB50010),a 4×6 span 8-story reinforced concrete frame structure model was established by using PKPM design software.Secondly,based on the component removal method,the finite element software SAP2000 was used to calculate the dynamic response characteristics of the frame structure with the failure of different single columns at the first floor,including the center column,long side middle column,short side middle column and corner column.The results show that the plastic angle is less than 6 for all the four column failure conditions,and the structure will not collapse.When the central column fails,the structural stability is the worst,and the probability of continuous collapse is the highest,followed by that of the short side and long side middle columns,and the corner column has the least probability.Under the condition of center column failure,the dynamic impact of the load on the residual structure is the most significant,with a maximum negative acceleration of about 3 g,which is twice as high as that of the short side middle column and the long side middle column.After the failure of the columns,the loads will be redistributed.The axial force will be borne by the adjacent columns,while the stress form of the upper beam will also change from bending to tension,resulting in a catenary effect.In the scenario of the central column failure,the axial force of the adjacent columns will increase by nearly 20%.

关 键 词：框架结构楼房 单根立柱失效 非线性动力分析 内力调整 动力响应特性 

分 类 号：TU746.5[建筑科学—建筑技术科学]