内配型钢的方钢管再生混凝土短柱轴压承载力分析  

Axial bearing capacity analysis of RAC-filled square steel tubular stub columns with encased profiled steel under axial compression

作　　者：刘坚[1,2] 张鹏程 刘长江 田勇 任达 曾嵘森[1] 柏宇翔 陈盼盼 LIU Jian;ZHANG Pengcheng;LIU Changjiang;TIAN Yong;REN Da;ZENG Rongsen;BO Yuxiang;CHEN Panpan(College of Civil Engineering,Guangzhou University,Guangzhou 510006,China;Guangdong Engineering Technology Research Center for Complex Steel Structures,Guangzhou 510006,China)

机构地区：[1]广州大学土木工程学院,广东广州510006 [2]广东省复杂钢结构工程技术研究中心,广东广州510006

出　　处：《混凝土》2021年第10期1-5,共5页Concrete

基　　金：国家自然科学基金项目(51678168);广东省自然科学基金项目(2017A030313267);广州市科技计划项目(201607010107)。

摘　　要：将内配型钢的方钢管再生混凝土截面等效为截面面积、含钢率相等的圆钢管再生混凝土截面,同时引入等效约束折减系数ψ与再生混凝土强度折减系数γu,对内配型钢的方钢管再生混凝土短柱轴压承载力进行理论分析,分析过程中运用了极限分析法和双剪统一强度理论,考虑了等效圆钢管型钢再生混凝土短柱内径厚比、套箍系数、型钢配钢率以及再生粗骨料取代率等因素对轴压承载力的影响,提出了一套适用于内配型钢的方钢管再生混凝土短柱轴压承载力计算式。在理论推导的基础上,将计算式计算结果与相关试验数据进行对比,吻合良好,验证了承载力计算式的有效性。研究结论可为此类构件承载力计算提供理论依据。The section of RAC-filled square steel tube is equivalent to the section of RAC-filled circular steel tube with the same sectional area and steel reinforced ratio.At the same time,introducing the equivalent restraint reduction factorψand recycled concrete strength reduction factorγu,then the bearing capacity analysis method of RAC-filled square steel tubular stub columns with encased profiled steel was deduced.Based on limit analysis and twin shear unified strength theory,given the parameters such as the replacement percentage of recycled coarse aggregate,steel reinforced ratio,diameter-to-thickness ratio and length-to-thinness ratio of short columns,ultimate bearing capacity calculation formula of RAC-filled square steel tubular stub columns with encased profiled steel are proposed.Meanwhile the bearing capacity of highly confined RAC and medium confined RAC was calculated respectively.According to the comparison of results between this calculation method and data of others′relevant test,the effectiveness of bearing capacity calculation formula is proved.The conclusions of in the paper can applied in other relevant researches.

关 键 词：方钢管再生混凝土 型钢 配钢率 再生粗骨料取代率 轴压承载力 

分 类 号：TU528.571[建筑科学—建筑技术科学]