箍筋约束ECC矩形截面短柱轴心受压试验研究  

Experimental research on axial compression behavior of ECC short rectangular-section columns confined with stirrups

作　　者：李艳[1] 王焕芳[1] 刘泽军[1] 陈卫峰[1] 

机构地区：[1]河南理工大学土木工程学院,河南焦作454003

出　　处：《混凝土》2018年第1期50-53,57,共5页Concrete

基　　金：国家自然科学基金资助项目(51208183);河南省科技攻关项目(132102310312);河南省高等学校青年骨干教师资助项目(2014GGJS-043);河南省高等学校重点科研项目(17A560005)

摘　　要：通过箍筋约束ECC矩形截面短柱的轴心受压试验,研究了箍筋约束作用对ECC应力-应变曲线的影响。研究结果表明:接近峰值荷载前,箍筋应变增长较快,试件达到峰值荷载时箍筋均已屈服,约束效果明显;体积配箍率较高、箍筋间距与直径较小及截面高宽比较小的ECC试件,箍筋的约束效果好,试件破坏后整体性较好;箍筋约束作用对ECC峰值应力与峰值应变的提高幅度不大,但约束ECC应力-应变曲线的下降段更为平缓,试件延性明显改善。Based on the axial compressive experiments of ECC rectangular-section columns confined with stirrups, the confinement ef- fect of stirrups on stress-strain curve of ECC was studied.Test results indicate that the stain of stirrups develops rapidly before the peak load and the stirrups yield when the specimens reach the peak load,which shows the confinement effect of stirrups is obvious.The speci- men which has higher volume stirrup ratio, smaller stirrup diameter and splicing or smaller ratio of section hight and width has better con- fining effect and shows better integrity.The confining effect of stirrups on peak stress and peak strain is not obvious, but the descending segment of stress-strain curve becomes more gently which present the increasement of deformation capacity and better ductility.

关 键 词：工程纤维增强水泥基复合材料 箍筋约束 轴心受压 应力-应变曲线 延性 

分 类 号：TU528.01[建筑科学—建筑技术科学]