具有可恢复性的BFRP约束混合配筋混凝土轴压短柱力学性能研究  

Study on axial compression behavior of hybrid reinforcement concrete stubs reinforced by BFRP with resilience

作　　者：巫文君[1] 姜绍飞[1] 林泉[1] 

机构地区：[1]福州大学土木工程学院,福建福州350116

出　　处：《福州大学学报（自然科学版）》2017年第2期167-172,198,共7页Journal of Fuzhou University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51278127);国家"十二五"科技支撑计划资助项目(2015BAK14B02-06)

摘　　要：为实现结构构件既具有较高承载力,同时具有较小的残余位移,提高震后的可修复性,提出具有可恢复性的BFRP管约束混合配筋混凝土构件.根据纤维体积包裹率、截面尺寸和混合配筋率三个参数,设计制作了4根BFRP管约束混合配筋混凝土短柱和3根不同对比柱,对其进行轴压试验.结果表明:试件的破坏属于强度破坏;纤维体积含量和截面尺寸的增加可以提高试件的承载力和刚度,而混合配筋对其提高幅度有限;该构件具有稳定的二次刚度;试件的应力-应变曲线可分为弹性段、弹塑性阶段和强化段,构件达到极限承载力后,荷载突降,达到无约束钢筋混凝土短柱承载力后稳定下降.最后提出该组合轴压短柱的承载力计算公式,计算结果和试验值吻合良好.Hybrid reinforced concrete-filled fiber reinforced polymer tubular columns were proposed so as to achieve the higher bearing capacity and smaller residual displacement simultaneously,improve the post-earthquake recoverability. Three design parameters,namely fiber rate,sectional dimension and mixed reinforcement ratio,are considered and thus 4 hybrid reinforced concrete-filled fiber reinforced polymer tubular columns and 3 contrast columns were prepared and tested under uni-axial load.The results indicate that failure modes of the columns are strength failure. With the fiber rate and section dimension increasing,the columns show a remarkably decreasing trend in the bearing capacity and stiffness. However,the effect of hybrid reinforcement on the increase extent is limited. Meanwhile the members have the stable post-yield stiffness. The typical stress-strain curve consists of elastic stage,elastic-plastic stage and strengthening stage. The capacity suddenly drops after reaching the ultimate bearing capacity and declines steady when the specimen achieves the bearing capacity of unconstrained reinforced concrete column. Finally an empirical formula is proposed for calculation the capacity,and the analytical values from the formula agree well with experimental results.

关 键 词：BFRP管 混合配筋 轴压短柱 可恢复性 二次刚度 

分 类 号：TU398[建筑科学—结构工程]