单轴对称十字型钢混凝土中长柱偏压性能试验研究  

EXPERIMENTAL INVESTIGATION ON SLENDER STEEL REINFORCED CONCRETE COLUMNS WITH MONOSYMMETRIC CROSS-SHAPED STEEL UNDER ECCENTRIC LOADING

作　　者：周天华[1] 余吉鹏 张钰 李亚鹏 ZHOU Tian-hua;YU Ji-peng;ZHANG Yu;LI Ya-peng(School of Civil Engineering,Chang’an University,Xi’an 710061,China)

机构地区：[1]长安大学建筑工程学院,西安710061

出　　处：《工程力学》2021年第4期111-122,共12页Engineering Mechanics

基　　金：陕西省重点研发计划项目(2019SF-239)。

摘　　要：为研究单轴对称十字型钢混凝土中长柱偏心受压性能,进行8根单轴对称十字型钢混凝土中长柱偏压试验,分别研究不同加载方向十字型钢偏心率和荷载偏心率对试件破坏模式、侧向挠度、荷载-挠度曲线和极限承载力的影响规律,建立该组合柱正截面受压承载力计算方法。结果表明:根据荷载偏心率的不同,组合柱表现出小偏心受压破坏和大偏心受压破坏两种形态,组合柱截面应变符合平截面假定。正向偏心时,十字型钢偏心率增大,试件极限承载力和变形能力小幅降低;负向偏心时,十字型钢偏心率对发生小偏心受压破坏的试件偏压性能影响较小,发生大偏心受压破坏的试件极限承载力随十字型钢偏心率增加略有提高;荷载偏心率增大,试件初始刚度和极限承载力降低。将单轴对称十字型钢偏于安全地换算成H型钢,采用规范JGJ 138-2016计算换算截面试件偏压承载力,计算结果偏于保守,采用该文提出的方法计算的试件偏压承载力与试验值吻合较好。To study the eccentric compression performance of slender steel reinforced concrete columns with monosymmetric cross-shaped steel, eight specimens were subjected to eccentric loading. The effects of the crossshaped steel eccentricity ratio and the load eccentricity ratio on the failure pattern, lateral deflection, load-lateral deflection curves and ultimate strength were studied in different eccentric directions. A computational method for the normal section strengths of slender steel reinforced concrete columns with monosymmetric cross-shaped steel is proposed. The specimens exhibited small-eccentricity compression failure and large-eccentricity compression failure according to the different load eccentricity ratios. The cross-section strain conformed to the plane section assumption. The ultimate strength and deformability of the specimens decreased with the increase of cross-shaped steel eccentricity ratio in the positive eccentric direction. In the negative eccentric direction, the cross-shaped steel eccentricity ratio had negligible effect on the eccentric compression performance of the specimens failed in smalleccentricity compression. With the increase in the cross-shaped steel eccentricity ratio, the ultimate strength of the specimens failed in large-eccentricity compression increased slightly. The initial stiffness and the ultimatestrength of the specimens decreased with the increase of the load eccentricity ratio. The monosymmetric crossshaped steel is equivalent to the H-shaped steel in a safe way, and the eccentric strengths of the transformed section specimens calculated by JGJ 138-2016 are conservative. The eccentric strengths of the specimens calculated by the proposed method agree well with the test results.

关 键 词：组合柱 单轴对称十字型钢 偏心受压 试验研究 承载力 

分 类 号：TU398.9[建筑科学—结构工程]