摘要
目的研究不同粗骨料取代率下L形方钢管再生混凝土组合异形柱在压弯扭等复合受力下的力学性能。方法采用ABAQUS软件建立L形方钢管再生混凝土组合异形柱有限元模型,分析其在压弯扭等复合受力下的受力机理,及常见参数对其力学性能的影响。结果在压弯扭复合受力作用下,不同粗骨料取代率下各试件的受力全过程均分为弹性阶段、弹塑性阶段和塑性阶段,当试件承受的轴压力大于0.4 F p且弯矩值大于0.6 M p时,试件抗扭承载力降低、延性较差。在相同的轴压力及弯矩作用下,随着粗骨料取代率的增大,试件的峰值扭矩和延性逐渐降低。结论在工程设计中,大轴压比试件应重点考虑扭矩对L形方钢管再生混凝土组合异形柱的影响。
This paper presents experimental studies on the compress-flexure-torsion mechanical behavior of the L-shaped column composed of recycled aggregate concrete-filled steel tubes(L-RACFST column).The replacement ratio of recycled concrete aggregate(RCA)was changed to explore the mechanical behavior of the columns.The FEM model of the L-RACFST column are established by ABAQUS,and its mechanical mechanism and the influence of common parameters on its mechanical are analyzed.The results show that the whole stress process of the L-RACFST column with different recycled coarse aggregate(RCA)replacement ratio can be divided into elastic stage,elastic-plastic stage and plastic stage under the compress-flexure-torsion combined action.When the axial compression of the L-RACFST column is greater than 0.4 F p and the flexure is greater than 0.6 M p,the torsional bearing capacity decreases and ductility weakens of the L-RACFST column.Under the same axial compression and flexure,with the increase of RCA replacement ratio,the peak torque of the L-RACFST column decreases gradually,and the ductility decreases.In engineering design,the effect of the L-RACFST column should be considered with large axial compression ratio.
作者
马腾飞
陈志华
杜颜胜
张宇桐
马斌
MA Tengfei;CHEN Zhihua;DU Yansheng;ZHANG Yutong;MA Bin(School of Civil Engineering,Tianjin University,Tianjin,China,300072;Department of Civil Engineering,North China Institute of Aerospace Engineering,Lanfang,China,065000;Langfang Urban Construction Engineering Group Corporation,Lanfang,China,065000)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2023年第3期437-445,共9页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家重点研发项目(2019YFD1101005)
中央引导地方科技发展资金项目(226Z1201G)
河北省自然科学基金面上项目(A2021409004)
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)。
关键词
L形异形柱
方钢管混凝土柱
再生混凝土
压弯扭复合受力
力学性能
L-shaped column
concrete-filled square steel tube
recycled aggregate concrete
compress-flexure-torsion combined action
mechanical behavior
