十字形截面钢骨约束混凝土本构模型试验研究  

Experimental study on constitutive model of steel confined concrete in SRC columns with cruciform steel section

作　　者：赵宪忠[1,2] 秦浩[2] 陈以一[1,2] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]同济大学土木工程学院,上海200092

出　　处：《建筑结构学报》2014年第4期268-279,共12页Journal of Building Structures

摘　　要：通过对20个十字形截面钢骨约束混凝土柱的轴压试验,分析钢骨翼缘宽厚比、钢骨面积与约束混凝土面积之比、钢骨翼缘约束开口大小、钢材与混凝土材性配比等参数对混凝土约束的影响,研究钢骨对混凝土约束的作用机理。试验结果表明:钢骨面积与约束混凝土面积之比和钢骨强度是影响混凝土约束的主要因素。通过有限元的校核和验证,建立以上两个因素与约束混凝土强度和延性的函数关系,提出适用于钢骨约束混凝土柱的约束混凝土本构模型。Experimental study was carried out on 20 axially loaded steel confined concrete columns with cruciform steel section to investigate the mechanism of concrete confinement provided by steel. The effects of the width-to-thickness ratio of the steel flange, the area ratio of steel to confined concrete, the confined dimensions of steel flange, and the strength ratio of steel to concrete, on the behavior of the confined concrete were examined. Experimental results reveal that area ratio of steel to confined concrete and the strength grade of steel are the main parameters for the concrete confinement provided by steel. A constitutive model for steel confined concrete is proposed in the form of a function of area ratio of steel to confined concrete. To validate the accuracy of the model, both experiment and finite element analysis are conducted.

关 键 词：钢骨约束混凝土柱 静力试验 约束作用机理 本构模型 

分 类 号：TU398.9[建筑科学—结构工程] TU317.1