轴压下FRP管-混凝土-钢管组合柱可靠性分析  

Reliability Analysis of FRP-Concrete-Steel Tubular Composite Column Under Axial Compression

作　　者：高海洋 王连广[1] 陈百玲[1] GAO Hai-yang;WANG Lian-guang;CHEN Bai-ling(School of Resources&Civil Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2024年第3期430-438,共9页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金青年基金资助项目(51808100).

摘　　要：以85个FRP管-混凝土-钢管双壁空心柱(double-skin tubular column,DSTC)轴压试验数据作为统计样本,评估了几种现有FRP约束混凝土强度模型,最终选择Teng模型进行可靠性分析,并确定了强度模型误差和构件抗力的最佳概率分布.运用JC法对DSTC进行可靠度计算.结果表明:可靠指标随着钢管强度、中空率和含钢率的提高而升高,而对混凝土强度的变化不敏感.FRP约束应力的增加会导致可靠指标的下降.基于可靠指标目标3.7,提出一个适用于DSTC的抗力分项系数表达式.Several existing FRP-confined concrete strength models were evaluated by using 85 FRP‑concrete‑steel DSTC(double‐skin tubular column)axial compression test data as statistical samples.Finally,Teng’s model was selected for reliability analysis,and the optimal probability distributions of strength model error and resistance were determined.The reliability of DSTC was calculated using the JC method.The results show that the reliability index increases with the increase of steel tube strength,hollow ratio and steel ratio,while it is not significantly influenced by concrete strength.The increase in FRP confining stress leads to the decrease in reliability index.Based on the target reliability index of 3.7,a new expression of resistance partial factor is proposed for DSTC.

关 键 词：DSTC 强度模型 可靠性分析 JC法 抗力分项系数 FRP 

分 类 号：TU312.1[建筑科学—结构工程]