L形方钢管再生混凝土组合异形柱偏压承载力计算方法  

Calculation method of eccentric load-bearing capacity of L-shaped column composed of recycled aggregate concrete-filled square steel tube

作　　者：马腾飞 陈志华[1] 杜颜胜 MA Tengfei;CHEN Zhihua;DU Yansheng(School of Civil Engineering,Tianjin University,Tianjin 300072,China;Department of Civil Engineering,North China Institute of Aerospace Engineering,Langfang 065000,Hebei,China;Technical Innovation Center of Building Insulation and Structure Integration in Hebei Province,Langfang 065000,Hebei,China)

机构地区：[1]天津大学建筑工程学院,天津300072 [2]北华航天工业学院建筑工程学院,河北廊坊065000 [3]河北省建筑保温与结构一体化技术创新中心,河北廊坊065000

出　　处：《建筑科学与工程学报》2025年第1期82-89,共8页Journal of Architecture and Civil Engineering

基　　金：国家重点研发计划项目(2019YFD1101005);河北省高等学校科学技术研究项目(QN2021003);北华航天工业学院科研基金项目(ZD-2022-05);中央引导地方科技发展资金项目(226Z1201G);河北省高等学校科学技术研究项目青年拔尖人才项目(BJ2019059)。

摘　　要：基于叠加原理,在《矩形钢管混凝土组合异形柱技术规程》提供的理论计算公式基础上,研究了L形方钢管再生混凝土组合异形柱偏压承载力计算方法。在考虑再生混凝土有效约束面积影响的基础上,提出了L形方钢管再生混凝土组合异形柱偏压承载力计算公式,绘制出轴力-弯矩关系曲线。结果表明:通过引入钢管对内填再生混凝土的约束效应系数,考虑钢管对不同粗骨料取代率再生混凝土的有效约束作用,并根据约束强弱将钢管对内填再生混凝土的约束区域进行划分,可得到再生混凝土的有效约束面积;通过与试验及数值模拟结果对比,验证了L形方钢管再生混凝土组合异形柱偏压承载力计算公式的有效性,该公式可用于预测L形方钢管再生混凝土组合异形柱的偏压承载力,轴力-弯矩关系曲线可较为准确且安全地预测试件的承载力。According to the superposition principle,the calculation method of eccentric compression bearing capacity of L-shaped column composed of recycled aggregate concrete-filled square steel tube(L-RACFST)was studied based on the theoretical calculation formula provided by the Technical Specification for Special-shaped Column Structure Composed of Concrete-filled Rectangular Steel Tubes.Considering the effect of recycled concrete effective restraint area,the calculation formula of eccentric bearing capacity of the L-RACFST was put forward,and the axial force-bending moment(N-M)relationship curve was drawn.The results show that by introducing the restraint influence coefficient of the steel tube on the recycled coarse aggregate(RCA),considering the effective restraint effect of the steel tube on the recycled concrete with different RCA replacement ratio,and dividing the restraint area of steel tube on RAC according to the constraint strength,the effective restraint area of recycled concrete can be obtained.By comparing with the experimental and numerical simulation results,the validity of the calculation formula of the eccentric compression bearing capacity of the L-RACFST is verified.The formula can be used to predict the eccentric compression bearing capacity of the L-RACFST,and the N-M relationship curve can predict the bearing capacity of the specimen more accurately and safely.

关 键 词：方钢管混凝土柱 L形异形柱 再生混凝土 偏压承载力 计算方法 

分 类 号：TU398[建筑科学—结构工程]