不同加载角度下T形带肋和多室钢管混凝土构件受弯性能研究  

Flexural behavior of stiffened and multi-cell T-shaped CFST members with different loading angles

作　　者：郑永乾[1] 曾少昔 ZHENG Yongqian;ZENG Shaoxi(Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering,Fujian University of Technology,Fuzhou 350118,China)

机构地区：[1]福建工程学院福建省土木工程新技术与信息化重点实验室,福建福州350118

出　　处：《建筑结构学报》2022年第4期198-207,219,共11页Journal of Building Structures

基　　金：国家自然科学基金项目(51678151);福建省自然科学基金项目(2019J01780);福建省高等学校新世纪优秀人才支持计划(GYZ18154)。

摘　　要：为研究不同加载角度下T形带肋和多室钢管混凝土构件的纯弯性能,以加载角度(0°、63°、90°、117°和180°)为试验参数,进行了11个T形钢管混凝土构件(包括5个带肋、5个多室和1个无肋)的纯弯试验,获得了破坏形态、弯矩-挠度曲线、应变、受弯承载力和抗弯刚度。建立了不同加载角度下T形构件有限元模型,考虑了残余应力和冷弯强化效应,计算结果与试验结果吻合良好。进行了受弯承载力参数分析,通过在0°基础上考虑加载角度影响的方法,获得不同加载角度情况下T形带肋和多室钢管混凝土构件的受弯承载力简化计算式。研究结果表明:带肋和多室T形钢管混凝土构件在不同加载角度下具有良好的受弯性能,加载角度对T形构件的受弯承载力有一定影响,影响幅度总体在14%以内,在112.5°加载角度附近的受弯承载力最低;设置纵向加劲肋和多室截面形式可使T形钢管混凝土构件的受弯承载力分别提高11%和26%左右,多室构件受弯承载力比带肋构件高;残余应力和冷弯强化对构件初始抗弯刚度影响不大,考虑冷弯强化的受弯承载力比不考虑情况提高7%以上。In order to study the flexural behavior of stiffened and multi-cell T-shaped concrete-filled steel tubular(CFST)members with different loading angles,a total of eleven specimens(including five stiffened,five multi-cell and one unstiffened specimens)with different loading angles(0°,63°,90°,117°and 180°)were tested under pure bending.The failure mode,bending moment-deflection curve,strain,flexural capacity and flexural stiffness were obtained.A finite element model of T-shaped members with different loading angles was developed,considering the residual stress and cold-formed effect.The calculated results agreed well with the test results.A parametric study on flexural capacity was performed.The simplified formulas on flexural capacity of stiffened and multi-cell T-shaped CFST members with different loading angles were proposed based on the flexural capacity with loading angle of 0°.The results show that the stiffened and multi-cell T-shaped CFST members exhibit good flexural behavior at different loading angles.The loading angle has a certain influence on the flexural capacity of T-shaped members and the variation is generally less than 14%.The members show the lowest flexural capacity with the loading angle of near 112.5°.Setting longitudinal stiffeners and using multi-cell cross-section can enhance the flexural capacity of T-shaped CFST members by about 11%and 26%,respectively.The multi-cell members show higher flexural capacity than the stiffened members.The initial flexural stiffness is not affected by residual stress and cold-formed effect,while the flexural capacity is increased by more than 7%with considering the cold-formed effect.

关 键 词：T形钢管混凝土 带肋 多室 加载角度 纯弯试验 受弯承载力 

分 类 号：TU398.903[建筑科学—结构工程] TU311.41