反复荷载下方钢管型钢再生混凝土组合柱受力性能有限元分析  

Finite element analysis on the mechanical performance of steel-reinforced recycled concrete filled square steel tube composite columns under cycle repeated loads

作　　者：马辉[1,2] 杨柳毅 赖志强[3] 刘方达 MA Hui;YANG Liuyi;LAI Zhiqiang;LIU Fangda(State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi’an University of Technology,Xi’an 710048,China;School of Civil Engineering and Architecture,Xi’an University of Technology,Xi’an 710048,China;China National Heavy Machinery Research Institute Co.,Ltd.,Xi’an 710048,China)

机构地区：[1]西安理工大学省部共建西北旱区生态水利国家重点实验室,陕西西安710048 [2]西安理工大学土木建筑工程学院,陕西西安710048 [3]中国重型机械研究院股份公司,陕西西安710048

出　　处：《自然灾害学报》2025年第1期167-178,共12页Journal of Natural Disasters

基　　金：国家自然科学基金项目(51408485);陕西省自然科学基础研究计划项目(2024JC-YBMS-440);工程材料与结构加固福建省高校重点实验室(三明学院)开放基金项目(B170001-16)。

摘　　要：在方钢管型钢再生混凝土组合柱低周反复荷载试验研究的基础上,通过ABAQUS有限元软件建立了该组合柱的数值计算模型,分析了组合柱的应力云图及变形特征,研究了组合柱的滞回曲线和骨架曲线,通过与试验的对比验证了模型的合理性。结果表明,反复水平荷载作用下柱脚方钢管屈曲鼓起,内部型钢达到屈服且再生混凝土被压碎,组合柱呈压弯塑性铰破坏模式。在分析参数的范围内,方钢管强度可以大幅度提升组合柱承载力,但却在一定程度上减小了组合柱的延性。提高方钢管的壁厚,组合柱的承载力大幅度提升。合理设计组合柱的剪跨比对其抗震性能的发挥十分重要,故在实际工程中应避免短柱脆断和长柱失稳;此外,随着再生骨料取代率的增加,组合柱的承载力提升较小,其延性随取代率的增加略有降低。Based on the low cycle repeated load tests on the steel-reinforced recycled concrete filled square steel tube composite columns,the numerical calculation model of composite columns was established by ABAQUS finite element software in this paper.The stress nephogram and deformation characteristics of composite columns were analyzed,and the hysteresis curves and skeleton curves of composite columns were also studied.In addition,the reasonableness of numerical model was also verified by comparing with the test results.The results show that square steel tube column base buckled and bulged under repeated horizontal loads,the internal profile steel of composite column reaches yield and the recycled concrete is crushed,and the composite column exhibits a compression bending plastic hinge failure mode.Within the range of the analyzed parameters,the strength of square steel tube can substantially increase the bearing capacity of columns,but it reduces the ductility of columns to a certain extent.By increasing the wall thickness of square steel tube,the bearing capacity of columns is substantially increased.Reasonable design of the shear span ratio of composite columns is crucial for their seismic performance,so in practical engineering,the brittle fracture of short columns and instability of long columns should be avoided.Furthermore,as the replacement rate of recycled aggregate increases,the load carrying capacity of the combined column improves less,and their ductility decreases slightly with the increase of substitution rate.

关 键 词：再生混凝土 钢管混凝土柱 数值模型 反复荷载 非线性分析 

分 类 号：TU398[建筑科学—结构工程]