钢管约束和外粘碳纤维布加固震损预制混凝土管组合短柱抗震性能研究  

Seismic performance of seismic-damaged concrete-filled precast concrete tube columns strengthened by steel jacket and CFRP

作　　者：张锡治[1,2] 闻龙翔 李星乾 栗庶斌 章少华 ZHANG Xizhi;WEN Longxiang;LI Xingqian;LI Shubin;ZHANG Shaohua(School of Civil Engineering,Tianjin University,Tianjin 300072,China;Tianjin University Research Institute of Architectural Design and Urban Planning Co.,Ltd,Tianjin 300073,China)

机构地区：[1]天津大学建筑工程学院,天津300072 [2]天津大学建筑设计规划研究总院有限公司,天津300073

出　　处：《建筑结构学报》2024年第11期92-106,共15页Journal of Building Structures

基　　金：国家自然科学基金项目(52278203);天津市科技计划项目(19YDLYSN00120)。

摘　　要：为研究钢管约束加固和外粘碳纤维布加固震损预制混凝土管组合短柱的抗震性能,通过改变钢管厚度、碳纤维布层数、轴压比、剪跨比以及柱的浇筑形式,完成11个震损预制混凝土管组合短柱和1个震损现浇钢筋混凝土短柱加固后的往复加载试验。分析加固后组合短柱的破坏过程及最终破坏状态、滞回性能、承载力以及耗能能力。结果表明:配合高强无收缩灌浆料的使用,两种加固方式均能达到快速修复并恢复构件使用功能的目的;加固后短柱破坏模式为剪切破坏,所有试件承载力均能够恢复至原有水平,部分试件加固后极限位移角提高幅度达100%以上,变形能力得到显著提升。建立了钢管约束和外粘碳纤维布加固震损预制混凝土管组合短柱的受剪承载力计算公式,计算值与试验值吻合较好,相较于试验值,计算值偏于安全。To study the seismic performance of seismic-damaged concrete-filled precast concrete tube(CFPCT) columns,which were strengthened by steel jacket and carbon fiber reinforced polymer(CFRP),cycling loading tests were conducted on 11 seismic-damaged CFPCT columns and one seismic-damaged reinforced concrete short column.The test parameters include the steel tube thickness,quantities of CFRP sheets,axial compression ratio,shear span ratio and concrete pouring methods.The effects of these parameters on the failure mode,hysteretic behavior,bearing capacity and energy dissipation of the test specimens were studied.The results show that with the use of high-strength non-shrink grout,both retrofitting methods achieve the purpose of rapid repair and restore the function of the specimens.The failure modes of specimens are shear failure.The bearing capacity of seismic-damaged short columns can be restored to the original level after retrofitting.The ultimate displacement angle of some specimens are increased by more than 100%.Deformation capacity of strengthened specimens are all significantly improved.This paper also established a formula to calculate the shear bearing capacity of the retrofitted CFPCT columns and the results obtained from the formula are conservative compared to the test values.

关 键 词：预制混凝土管组合短柱 钢管约束混凝土 碳纤维复合材料 加固 拟静力试验 受剪承载力 

分 类 号：TU375.3[建筑科学—结构工程] TU317.1