续建工程中复合加固型钢混凝土柱新增截面强度利用系数  

Strength utilization coefficient of new section of compositely strengthened steel reinforced concrete columns

作　　者：张喜德[1,2,3] 黎力设 杨涛 Zhang Xi-de;Li Li-she;Yang Tao(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Nanning,530004,China;Guangxi Key Laboratory of Disaster Prevention and Structural Safety,Nanning 530004,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]工程防灾与结构安全教育部重点实验室,广西南宁530004 [3]广西工程防灾与结构安全重点实验室,广西南宁530004

出　　处：《工程抗震与加固改造》2020年第5期39-45,共7页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金资助项目(51568005);中国博士后科学基金资助项目(43XB3782XB);广西自然科学基金面上项目(2018GXNSFAA138204)。

摘　　要：以实际工程为背景,研究复合加固型钢混凝土柱的新增截面强度利用系数。在南宁丽园天际城整个续建工程施工中,对地下室-3层复合加固柱新增混凝土截面的纵筋应力进行监测,结果显示,纵筋应力随结构楼层数的增加呈增大趋势,表明新增截面参与了受力,但在施工全过程中,应力的增加并非线性,中间过程底层柱出现内力重分布现象;提出了一种基于实际工程监测数据的复合加固柱新增截面极限强度利用系数计算方法,并计算得到其在达到轴心受压极限承载力时新增截面的平均强度利用系数分别为0.826、0.830,新增截面极限强度利用率较高,表明增大截面具有良好效果;新增截面的强度达到了极限强度的80%以上,可作为今后加固设计时参考。The strength utilization coefficient of the new section of the compositely strengthened steel reinforced concrete columns is researched based on practical engineering.In the whole construction process of Liyuan Tianji Town in Nanning,the stress of longitudinal reinforcement of the new concrete section of the compositely strengthened columns in the basement is monitored.The results show that the stress of the longitudinal reinforcement increases with the number of floors,which indicates that the new section is better involved in stress.However,during the entire construction process,the stress does not increase linearly,and the internal force redistribution occurres in the bottom column in the middle process.A calculation method for the ultimate strength utilization coefficient of the new section of the compositely strengthened column is proposed based on the practical engineering monitoring data,and the ultimate strength utilization coefficients of the new section are calculated,which are 0.826 and 0.830,respectively.The utilization ratio of the strength of the new section is high,which show that increasing section had good effect.The strength of the new section exceeded 80%of the ultimate strength,which can be used as a reference for strengthen design in the future.

关 键 词：型钢混凝土柱 复合加固 外包角钢 增大截面 强度利用系数 

分 类 号：TU398[建筑科学—结构工程]