高强螺旋筋约束普通混凝土柱轴压性能试验  

Experimental study on axial compression behavior of concrete columns confined by high strength spiral reinforcement

作　　者：经承贵 徐仲恒 武彤 黄雪松 李伟钊 JING Chenggui;XU Zhongheng;WU Tong;HUANG Xuesong;LI Weizhao(School of Civil and Architectural Engineering,Guangxi University of Science and Technology,Liuzhou 545006,China)

机构地区：[1]广西科技大学土木建筑工程学院,广西柳州545006

出　　处：《广西科技大学学报》2024年第1期41-47,共7页Journal of Guangxi University of Science and Technology

基　　金：广西自然科学基金项目(2019GXNSFBA245071);广西科技基地和人才专项(AD19245131);广西科技大学博士基金项目(校科博19z41);广西科技大学研究生教育创新计划项目(GKYC202228)资助。

摘　　要：为研究高强螺旋筋约束普通混凝土柱的轴压性能,以螺旋筋强度和螺旋筋配箍率为变化参数,制作了5个试件并进行了轴心受压试验。通过试验观测试件破坏全过程和最终失效模式,获取荷载-位移曲线和荷载-应变曲线,并对变化参数对约束混凝土力学性能指标的影响规律进行分析。试验结果表明:螺旋筋能提供较强约束作用,使得混凝土由脆性破坏转变为延性破坏;提高螺旋筋的配箍率能小幅提高螺旋筋的约束作用,当螺旋筋配箍率从1.89%提高到3.02%时,轴压承载力提高幅度为18%~38%,核心约束混凝土强度与非约束混凝土强度之比为1.8~3.8;提高螺旋筋强度能显著提高螺旋筋的约束作用,当螺旋筋强度从432 MPa提高到1 774 MPa时,核心约束混凝土强度与非约束混凝土强度之比从1.9提高到3.3,峰值位移增大约2.7倍。To investigate the axial compression behavior of concrete columns confined by high strength spiral reinforcement,10 specimens were made and tested under axial compression with the strength and reinforcement ratio of spiral reinforcement as varying parameters.The whole failure process and final failure mode of the specimen were observed through the test;the load displacement curve and load strain curve were obtained;and the effect of varying parameters on mechanical properties of confined concrete was also analyzed.The test results show that spiral reinforcement could provide a strong confined effect,making the concrete change from brittle failure to ductile failure;increasing the reinforcement ratio of spiral reinforcement could slightly improve the confined effect of spiral reinforcement.When the reinforcement ratio of spiral reinforcement increased from 1.89%to 3.02%,the axial compression capacity increased by 18%~38%,the strength ratio of the core confined concrete to non-confined concrete was 1.8~3.8;increasing the strength of spiral reinforcement could significantly improve the confined effect of spiral reinforcement.When the strength of spiral reinforcement increased from 432 MPa to 1774 MPa,the strength ratio of the core confined concrete to non-confined concrete increased from 1.9 to 3.3,and the peak displacement increased by about 2.7 times.

关 键 词：约束混凝土 螺旋筋 高强钢筋 轴压性能 承载力 

分 类 号：TU375.3[建筑科学—结构工程]