建筑钢结构进展2025，Vol.27Issue(3)：1-11,11.DOI:10.13969/j.jzgjgjz.20230928001
矩形中空夹层钢管混凝土梁纯弯力学性能有限元分析
Mechanical Performance Finite Element Analysis of Rectangular CFDST Beams Subject to Pure Bending Load
摘要
Abstract
A new type of rectangular concrete-filled double-skin steel tubular(CFDST)beam was proposed.The inner tube is eccentrically placed on the tension side of the beam,effectively reducing the cross-sectional area of concrete in the tension zone,fully utilizing the characteristics of steel in tension and concrete compression.Using the finite element analysis software of ABAQUS,a finite element model of the CFSDT beam under bending load was established.Based on the finite element analysis method validated by experimental results from others,mechanism analysis and parameter analysis were conducted on the new composite beam,with varying parameters including the eccentricity of the inner tube,the hollowness ratio,the yield strength of the inner and outer tube,and the concrete strength.The analysis results show that,when the steel quantity,section height and width are consistent,the ultimate flexural load-carrying capacity of the CFDST beam with eccentrically placed inner tube is 1.6 to 2.1 times that of H-shaped steel beam and 2.3 to 2.6 times that of hollow steel tube beam,with better ductility.The larger the section height of the component,the greater proportion of the bending moment borne by the inner and outer steel tubes.The moment-deflection curve of the rectangular CFDST pure bending component can be roughly divided into the elastic stage,the elastic-plastic stage,and the strengthening stage.The beam with eccentrically placed inner tube exhibits better load-carrying capacity and ductility compared to the beam with concentrically placed inner tube.The yield strength of the inner and outer steel tubes and the compressive strength of the concrete are the main factors affecting the mechanical performance of the CFDST beam with eccentrically placed inner tube.Finally,a simplified formula for the flexural capacity of CFDST beams with eccentrically placed inner tube is proposed.关键词
矩形中空夹层钢管混凝土梁/空心率/偏心率/纯弯性能/参数分析Key words
rectangular concrete-filled double-skin steel tubular beam/eccentricity ratio/hollowness ratio/pure bending performance/parameter analysis分类
土木建筑引用本文复制引用
殷隆涛,黄宏,汪镕鹏,胡斌..矩形中空夹层钢管混凝土梁纯弯力学性能有限元分析[J].建筑钢结构进展,2025,27(3):1-11,11.基金项目
国家自然科学基金(52368016),江西省研究生创新资金项目(YC2022-s511),江西省教育厅科学技术研究重点项目(GJJ210649) （52368016）
