反复荷载下方钢管型钢再生混凝土组合柱抗震性能试验研究  

Experimental study on seismic performance of steel reinforced recycled concrete filled square steel tube composite columns under cyclic loading

作　　者：马辉[1,2] 胡杰江 赖志强[3] 刘方达 MA Hui;HU Jiejiang;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 710018,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710018

出　　处：《铁道科学与工程学报》2024年第10期4161-4174,共14页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51408485);陕西省自然科学基础研究计划项目(2022JM-258);西安市科技计划项目(24GXFW0063)。

摘　　要：为研究方钢管型钢再生混凝土组合柱的抗震性能,通过对9个组合柱试件进行低周反复荷载试验,对其地震破坏特征进行分析,并详细探究再生粗骨料取代率、型钢配钢率、方钢管宽厚比和轴压比等影响参数对组合柱承载力、延性及耗能能力等抗震性能指标的影响。研究结果表明:在反复水平荷载作用下组合柱呈现典型的压弯塑性铰破坏模式。组合柱的荷载-位移滞回曲线呈饱满“纺梭形”,具有较好的耗能能力。再生粗骨料取代率对组合柱的承载力的影响较小,随着再生粗骨料取代率的增加,组合柱的延性和耗能能力逐渐下降,延性和耗能能力最大分别下降7.83%和7.6%,组合柱试件承载力先升高后下降,承载力最大变化幅值为1.98%,影响幅值较小。随着方钢管宽厚比的减小或型钢配钢率的提高,组合柱的承载力和延性均得到提高,宽厚比从100降至33,承载力提高了57.44%,而型钢配钢率从4.2%增长至6.3%,承载力和延性则分别提高了21.45%和20.44%,说明方钢管宽厚比和型钢配钢率对组合柱抗震性能影响较大。另外,增大轴压比对组合柱试件的抗震性能不利,随着轴压比的增大,组合柱的滞回曲线饱满度下降,延性降低,轴压比从0.2提高到0.6,延性降低了11.11%。研究结论可为方钢管型钢再生混凝土组合柱的抗震设计提供参考。To investigate the seismic performance of steel-reinforced recycled aggregate concrete filled square steel tube composite columns,the seismic failure characteristics of 9 specimens were analyzed by the low-cyclic repeated loading tests.The effects of the replacement rate of recycled coarse aggregate,steel ratio of profile steel,width to thickness ratio of square steel tube and axial compression ratio on the seismic performance indicators of composite columns,including the bearing capacity,ductility,and energy dissipation capacity,were studied in detail.The results indicate that the composite columns exhibit typical plastic hinge failure mode under cyclic loading.The load-displacement hysteresis curves of composite column show a full“spindle”shape,indicating excellent energy dissipation capacity.There was minimal effect on the bearing capacity of composite columns of the replacement rate of recycled coarse aggregate.With the increase of the replacement rate of recycled coarse aggregates,the ductility and energy dissipation capacity of the composite columns gradually decreased,with a maximum decrease of 7.83%and 7.6%respectively.The bearing capacity of the composite columns initially increases and then decreases,with the maximum variation in bearing capacity being 1.98%,reflecting a relatively minor impact.The bearing capacity and ductility of composite columns were improved by reducing the width to thickness ratio of square steel tube or increasing the steel ratio of profile steel.The width to thickness ratio of square steel tube decreases from 100 to 33,which results in an increase of 57.44%in the bearing capacity.As the steel ratio of profile steel increases from 4.2%to 6.3%,the bearing capacity and ductility increase by 21.45%and 20.44%,respectively,indicating that the width to thickness ratio of square steel tube and the steel ratio of profile steel have greater influence on the seismic performance of the composite columns.In addition,increasing the axial compression ratio is unfavourable to the seismic pe

关 键 词：再生混凝土 型钢混凝土 方钢管混凝土柱 低周反复荷载 抗震性能 

分 类 号：TU391[建筑科学—结构工程]