箍筋约束L形截面柱轴压性能分析

为了研究箍筋约束混凝土L形截面柱的轴心受压性能，进行了7根箍筋约束混凝土柱的轴心受压试验，并采用有限元软件分析了箍筋对L形截面柱的核心混凝土的约束作用，建立了箍筋横向约束应力计算模型．在此基础上通过试验回归分析了箍筋约束混凝土的抗压强度、峰值应变与配箍特征值、箍筋有效约束系数的关系表达式，并建立了箍筋约束混凝土L形截面短柱的轴心受压承栽力计算公式．结果表明约束混凝土的抗压强度及其峰值应变与配箍特征值和箍筋有效系数的乘积呈非线性关系．与试验结果比较，轴心受压承载力计算公式偏于安全，可用于箍筋约束混凝土L形截面短柱的轴心受压承载力的分析．

Performance Analysis of Axially Loaded L-Shaped Columns Confined with Stirrups

To study the performance of axially loaded L-shaped columns confined with stirrups,7 L-shaped columns confined with stirrups were tested for axial compression loading. The stirrup effective restraint on core concrete of L-shaped columns was studied with finite element software and the calculation model of stirrup transversal restraint stress was established. According to the tests,the relational expressions of compressive strength,peak strain of confined concrete and stirrup characteristic values,stirrup effective restraint coefficient were regressively analyzed,and the calculation formula of ultimate bearing capacity was presented for axially loaded short L-shaped columns confined with stirrups. Experimental results show that compressive strength and peak strain of confined concrete have a nonlinear relationship with the product of stirrup characteristic values and stirrup effective restraint coefficient. The calculation formula of ultimate bearing capacity is safe when compared with experimental results ,and it is applicable to the analysis of the ultimate bearing capacity of axially loaded short L-shaped columns confined with stirrups.