带T形钢翼缘的核心钢管混凝土组合柱轴压比限值研究
Study on axial compression ratio limit of concrete-filled steel tubular composite column with T-shaped steel flange
高亮 1王朋 2张鹏2
作者信息
- 1. 山东建筑大学 管理工程学院,山东 济南 250101
- 2. 西安建筑科技大学 土木工程学院,陕西 西安 710055
- 折叠
摘要
为了充分发挥带T形钢翼缘的核心钢管混凝土组合柱(T-CFST 柱)的变形性能,保证柱在地震作用下能满足延性需求,通过理论推导和数值模拟,对 T-CFST 柱的延性和轴压比限值进行研究.基于大小偏心受压界限破坏建立了T-CFST柱的标准轴压比和设计轴压比计算公式,同时基于ABAQUS软件建立了T-CFST柱的精细化有限元模型,在验证有限元模型准确性的基础上,研究了高轴压比下不同影响因素对组合柱延性的影响,建议了不同含钢率、型钢强度、混凝土强度下组合柱的设计轴压比限值.结果表明:T-CFST 柱延性随混凝土强度降低、截面含钢率降低、型钢强度提高、体积配箍率提高而提高;即使在较大轴压比时,柱的延性依然较好,T-CFST柱的轴压比限值在计算的基础上有所提高.
Abstract
In order to fully utilize the deformation performance of concrete-filled steel tubular composite column with T-shaped steel flanges(T-CFST column)and ensure that the columns can meet the ductility requirements under seismic action,the ductility and axial compression ratio limits of the T-CFST columns were investigated by theoretical derivation and numerical simulation.Based on the critical failure state between large eccentricity failure and small eccentricity failure,the formulas for calculating standard axial compression ratio and design axial compression ratio of T-CFST column was proposed.Based on the ABAQUS software,a refined finite element model of the T-CFST column was established.After verifying the accuracy of the finite element model,the influence of various influencing factors on the ductility of composite columns under high axial compression ratio was studied.The design axial compression ratio limits of composite columns under various steel ratios,steel strength and concrete strength were suggested.The results show that the ductility of T-CFST column increases with the decrease of concrete strength,the decrease of section steel ratio,the increase of steel strength and the increase of volume hoop ratio.Even at a large axial compression ratio,the ductility of the column is still good,and the limit of the axial compression ratio of the T-CFST column is allowed to be increased on the basis of calculation.
关键词
组合柱/延性性能/数值模拟/理论计算/轴压比限值Key words
composite column/ductility performance/numerical simulation/theoretical calcula-tion/axial compression ratio limit引用本文复制引用
基金项目
山东建筑大学博士科研基金(X21009Z)
国家自然科学基金(52178159)
国家自然科学基金(51608434)
出版年
2024
NETL
NSTL
万方数据