外套螺栓连接钢管夹层混凝土加固柱轴压力学性能数值模拟  

Numerical Simulation of Axial Compression Performance of Bolt-connected Steel Tube and Sandwiched Concrete Jacketed RC Columns

作　　者：倪赛雄 陈兆荣 郭朋鑫 蔡健[2] 蔡志立 左志亮[2] 陈庆军[2] 梁泳锋 NI Saixiong;CHEN Zhaorong;GUO Pengxin;CAI Jian;CAI Zhili;ZUO Zhiliang;CHEN Qingjun;LIANG Yongfeng(The Third Construction Co.,Ltd.of China Construction Fifth Engineering Bureau,Changsha,Hunan 410004,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou,Guangdong 510641,China)

机构地区：[1]中建五局第三建设有限公司,湖南长沙410004 [2]华南理工大学土木与交通学院,广东广州510641

出　　处：《施工技术(中英文)》2023年第22期41-51,共11页Construction Technology

基　　金：中建五局科技研发计划:烂尾楼续建全过程安全评估及加固改造关键技术研究(CSCEC5B-2021-20)。

摘　　要：为解决外套钢管夹层混凝土加固柱施工时需对2个半圆钢管进行焊接,工作量大、有焊接残余应力等问题,提出对2个半圆钢管采用高强螺栓连接的外套钢管夹层混凝土加固柱。建立29个有限元模型,研究高强螺栓尺寸、螺栓间距、钢管厚度、钢管强度对采用螺栓连接的外套钢管加固柱轴压性能的影响,并提出钢管螺栓连接设计方法和加固柱轴压承载力计算方法。研究结果表明:加固后,柱的承载力提高2.34~3.07倍,外套螺栓连接钢管加固柱与外套焊接连接钢管加固柱的承载力比值大于0.98;所提出的螺栓连接单元环向拉力计算公式与有限元模拟的计算结果吻合良好;高强螺栓在达到极限承载力时按承压型螺栓设计,轴压承载力按0.95倍的外套焊接连接钢管夹层混凝土加固柱计算,设计结果偏安全。In order to solve the problems of welding two semi-circular steel tubes,large workload and welding residual stress in the construction of steel tube and sandwiched concrete jacketed RC columns,a steel tube and sandwiched concrete jacketed RC columns connected by high-strength bolts is proposed.A total of 29 finite element models were established to study the effects of high-strength bolt size,bolt spacing,steel pipe thickness,and steel pipe strength on the axial compression performance of reinforced columns with outer steel tubes connected by bolts.The design method of steel tube bolt connection and the calculation method of axial compression bearing capacity of reinforced columns were proposed.The results show that after reinforcement,the bearing capacity of the column is increased by 2.34~3.07 times,and the bearing capacity ratio of the bolt-connected steel tube and sandwiched concrete jacketed RC column and the one with welded steel tube was found to be greater than 0.98.The proposed formula for calculating the circumferential tension of bolted connection units was in good agreement with the calculation results of finite element simulation.High-strength bolts could be designed as pressurebearing bolts when reaching the ultimate bearing capacity.The axial bearing capacity could be calculated as 0.95times of the welded steel tube and sandwiched concrete jacketed RC column,and the design result is safe.

关 键 词：加固柱 钢管 混凝土 螺栓 轴压性能 数值模拟 

分 类 号：TU375[建筑科学—结构工程]