不同柱失效对T型钢连接子结构抗倒塌性能影响  

Effect of different column failures on collapse resistance of T-stub connection substructure

作　　者：陈红 谭英华 郭玉旭[3] 席丰 CHEN Hong;TAN Yinghua;GUO Yuxu;XI Feng(School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China;Key Laboratory of Building Structural Retrofitting and Underground Space Engineering(Shandong Jianzhu University),Ministry of Education,Jinan 250101,China;School of Civil Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]山东建筑大学土木工程学院,山东济南250101 [2]山东建筑大学建筑结构加固改造与地下空间工程教育部重点实验室,山东济南250101 [3]重庆大学土木工程学院,重庆400044

出　　处：《山东建筑大学学报》2024年第2期27-37,79,共12页Journal of Shandong Jianzhu University

基　　金：国家自然科学基金项目(12172198,11672165);山东省研究生教育优质课程建设项目(SDYKC20158)。

摘　　要：结构倒塌会引起严重的人员伤亡和巨大的财产损失,研究结构抗倒塌性能可为结构设计提供指导和参考依据。文章通过对不同柱失效梁柱子结构的有限元数值模拟,分析结构的破坏模式和抗力机制,研究跨度比对角柱失效工况下梁柱子结构抗倒塌性能的影响。结果表明:中柱失效前,其承担的荷载在失效后的小变形阶段将更多地通过与失效柱强轴方向相连的梁传递到边柱,而在失效后的大变形阶段强轴和弱轴方向传递荷载能力相差不大;边柱失效工况下,只在对称方向的梁内产生了悬链线机制;在角柱失效情形,子结构中的梁构件只经历了梁机制作用阶段。比较3种柱失效工况,其角柱失效最危险,其原因在于梁构件没有产生悬链线机制;在角柱失效工况下,随着跨度比的增加,梁柱子结构极限承载力逐渐减小。Structural collapse will cause serious casualties and huge property losses,and studying collapse resistance of the structure can provide essential guidance and reference for structural design.Through the finite element numerical simulations on beam-column substructures experiencing different column failure scenarios,the failure mode and resistance mechanism of the structure were deeply analyzed,and the influence of span ratio on collapse resistance of beam-column substructure under corner column failure was discussed.The results show that prior to middle column failure,the load it bears will be transferred to the side column more through the beam connected to the major axis direction of the failed column during the early stages of deformation post-failure.However,during the stages of significant deformation that follow,the load transfer capacity between the major and minor axis directions shows little difference;Under the condition of side column failure,catenary mechanism only occurs in the beam in the symmetrical direction;In the case of corner column failure,the substructure’s beams only experienced the stage of bending mechanism;Among the three column failure scenarios analyzed,corner column failure is identified as the most perilous due to the absence of a catenary mechanism in the beam components;In the case of corner column failure,the ultimate load-bearing capacity of beam-column substructure decreases gradually with the increase of span ratio.

关 键 词：连续倒塌 T型钢节点 不同柱失效 跨度比 抗力机制 

分 类 号：TU391[建筑科学—结构工程]