受弯薄壁钢管混凝土的试验研究与设计

介绍薄壁钢管混凝土(CFST)所进行的一组抗弯试验。对4个宽厚比为50～100的试验样本进行测试,其中两个为正方形样本,两个为矩形样本。通过试验获得试验样本的荷载-位移曲线、失效模式和极限承载力。建立受弯薄壁CFSTs的分析模型。该分析模型包括了约束混凝土的材料性能、冷弯薄壁型钢混凝土强度的增强、残余应力及钢板局部屈曲。所提出的模型还能较为精确地预测试验样本的性能和强度。此外,对现行的AISC标准、欧洲规范4和Han模型中关于受弯薄壁CFSTs的适用性进行了评估。

Experimental Investigation and Design of Thin- Walled Concrete-Filled Steel Tubes Subject to Bending

A series of bending tests of thin-walled concretefilled steel tubes ( CFST ) were presented in this study.A total of 4specimens were tested , two square specimens and two rectangular specimens , with width to wall thickness ratio ranging from 50to 100.The load – displacement curves , failure mode and ultimate capacity of test specimens were obtained.An analytical model was developed for the thin-walled CFSTs subjected to bending.Material properties of confined concrete , corner strength enhancement of cold-formed steel sections , residual stresses and plate local buckling were considered in the developed model.The proposed model was able to predict the behavior and strengths of test specimens with reasonable accuracy.In addition , the suitability of current AISC standard , Eurocode 4and Han's model for thin-walled CFSTs subjected to bending was also evaluated.