爆炸荷载作用下RC梁-板子结构抗连续倒塌动力效应研究  

Anti-progressive collapse dynamic effect of RC beam-slab substructure under blast load

作　　者：李治 原小兰 董腾方 黄茜 邓小芳 LI Zhi;YUAN Xiaolan;DONG Tengfang;HUANG Xi;DENG Xiaofang(Guangxi Key Laboratory of New Energy and Building Energy Saving,Guilin University of Technology,Guilin 541004,China;College of Civil Engineering and Architecture,Guilin University of Technology,Guilin 541004,China;School of Management Engineering,Guangxi Construction Vocational and Technical College,Nanning 530028,China)

机构地区：[1]广西建筑新能源与节能重点实验室,广西桂林541004 [2]桂林理工大学土木与建筑工程学院,广西桂林541004 [3]广西建设职业技术学院管理工程学院,南宁530028

出　　处：《振动与冲击》2023年第9期27-35,46,共10页Journal of Vibration and Shock

基　　金：广西科技基地和人才专项(2021AC19076);广西自然科学基金(2022GXNSFBA035628);国家自然科学基金优秀青年基金(52022024);广西建筑新能源与节能重点实验室开发基金(桂科能22-J-21-3);广西中青年科研基础能力提升项目(2021KY0254)。

摘　　要：为研究爆炸荷载作用下建筑结构的抗连续倒塌性能。通过ANSYS/LS-DYNA有限元软件对爆炸荷载作用下钢筋混凝土(reinforced concrete,RC)梁-板子结构的抗连续倒塌动力效应进行研究,并对混凝土强度、钢筋配筋率和跨高比等参数进行拓展分析。研究结果表明,通过瞬间去柱模拟爆炸去柱会造成结构残余承载力和结构局部损伤程度偏保守或者偏高的后果。混凝土强度对结构的动力效应影响显著,当混凝土强度大于C40时,结构的压膜及压拱机制已足够阻止连续倒塌的发生。配筋率的提高对压拱机制抗力影响不大,但能显著提高悬链线机制的抗力。跨高比对结构抗力机制的发展有着显著的影响,降低跨高比可以提高结构压拱和压膜机制抗力,但是对悬链线机制抗力影响不大。Here,to study anti-progressive collapse performance of building structure under blast load,the finite element software ANSYS/LS-DYNA was used to study the anti-progressive collapse dynamic effect of reinforced concrete(RC)beam-slab substructure under blast load,and expansively analyze parameters,such as,concrete strength,reinforcement ratio and span-height ratio.The results showed that blasting to remove column simulated by using instantaneous column removal can cause conservative or higher residual load-bearing capacity and local damage of structure;concrete strength has a significant impact on the anti-progressive collapse dynamic effect of structure,when concrete strength is larger than C40,pressing film and arch pressing mechanisms of structure are enough to prevent progressive collapse happening;increase in reinforcement ratio has little effect on resistance of arch pressing mechanism,but can significantly improve resistance of catenary mechanism;span-height ratio has a significant impact on development of structural resistance mechanisms,decrease in span-height ratio can improve resistance of arch pressing and pressing film mechanisms,but have little impact on resistance of catenary mechanism.

关 键 词：钢筋混凝土(RC)梁-板子结构 爆炸荷载 动力效应 有限元分析 连续倒塌 

分 类 号：TU375[建筑科学—结构工程]