扩孔式顶底腹板角钢连接抗连续倒塌性能研究

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中图分类号：TU391 文献标志码：A 文章编号：1005-8249（2025）04-0137-06

DOI：10.19860/j.cnki.issn1005-8249.2025.04.025

XIN Wenzhi1 ， ZHAO Lijie1，2

（1. College of Civil Engineering， Hebei University of Engineering， Handan O56O17， China;

2.School of Water Conservancy Engineering，Tianjin Agricultural University， Tianjin 3OO384，China）

Abstract：Todeplyexplore the influenceof theexpansion holesizeonthecontinuous collpseresistance performanceof the expansion hole-typetop-bottom web stee plateconnection beam-column structure，this study takes this typeofconection beam- column structure as the research object. The finite element software Ansys/LS DYNA is used to establish a model of the column removal.Byanalyzing the bearingcapacity-displacementcurve，intemal force developmentcurveand loadresistance mechanism，theacuracyofthe model is verifiedandtheinfluencelawof theexpansionholesizeisrevealed.Theresultsshow that：as theexpansionholesize increases，thedisplacementcorresponding totheboltfractureincreases，butthestructural ultimatebearingcapacitydoesnotchangesignificantly；the beammechanismoftheexpansionholeconnectionis weakened comparedtotheconventionalholenodeundersmalldeformation，butthestructuralductilityissignificantlyenhanced；theload resistance mechanism analysis shows thatthe structureundergoes the beam mechanism，the mixed action ofthe beam mechanism andthecatenary mechanism，and the dominanceof the catenary mechanism in the colapseresistance process.The bearing capacityofthecatenarymechanismisrelatedtothefrictionforcegeneratedbytheboltslippage.Thisindicatesthatthe

expansiodesignachievesthe improvementof the structural ductilityanddeformationcapacitywithoutreducing thebearing capacity，andthesignificantenhancementof ductilityiscrucialforthestructure toresistcontinuouscolapseinthelarge deformation stage.Itshows that the expansion design canenhance thestructural collapse resistance performance byoptimizing the synergy of the anti-collapse mechanism.

Key words： reaming； top and bottom web angle stel；resistance to continuous collapse； numerical simulation

0 引言

1968年伦敦RonanPoint公寓燃气爆炸事故与2001年9月11日美国的世贸大厦受到恐怖袭击事件引起了众多学者对结构抗连续倒塌方面的研究，人们对建筑结构的安全性和鲁棒性提出了更高的要求。（剩余6542字）