(太原理工大学土木工程学院, 太原 030024)

摘要: 轴压比是影响圆中空夹层钢管混凝土构件抗撞性能的一个重要参数,因此,在前期试验研究基础上,采用ABAQUS 建立了圆中空夹层钢管混凝土构件在侧向撞击和轴力荷载耦合作用下的有限元分析模型,研究了不同轴压比下构件抗撞工作机理,并以名义截面含钢率、空心率与材料强度为主要参数,重点分析了轴压比对构件抗撞性能的影响. 结果表明:在侧向撞击和轴力荷载耦合作用下构件主要发生受弯破坏,外钢管与混凝土的塑性变形是构件的主要耗能机制;当轴压比从 0 增大到 0. 5 时,构件的抗撞性能先增强后减弱;随着构件名义截面含钢率、空心率和外钢管屈服强度的增大及混凝土强度的减小,轴压比对构件抗撞性能的有利影响范围分别减小约 75%、57%、15%和 18%.

关键词: 圆中空夹层钢管混凝土; 轴压比; 抗撞性能; 空心率

中图分类号:TU398. 9 文献标志码:A 文章编号:1002-848X(2023)12-0036-07

DOI:10. 19701 / j. jzjg. 20201281

Influence analysis of axial load ratio on impact resistance of circular concrete filleddouble-skin steel tubular

GUO Zhihui, WANG Rui, ZHAO Hui

(College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

Abstract: Axial load ratio is an important parameter that affects the impact resistance of circular concrete filled double-skinsteel tubular (CFDST) members. Therefore, based on preliminary experiments, finite element analysis (FEA) model ofCFDST combined lateral impact and axial load was established using ABAQUS. The working mechanism of CFDSTmembers with different axial load ratio under impact load was investigated. With nominal cross-sectional steel ratio, hollowratio and material strength as the main parameters, the influence of axial load ratio on the impact resistance was emphasislyanalyzed. The results show that under combined lateral impact and axial load, the members failed in flexural mode. Themain energy dissipation mechanism of members was the plastic deformation of outer steel tube and concrete. As the axialload ratio increased from 0 to 0. 5, the impact resistance of members increased first and then decreased. With the increaseof nominal cross-sectional steel ratio, hollow ratio and yield strength of external steel tube, and the decrease of concretestrength, the favorable influence range of axial load ratio on the impact resistance of members decrease by about 75%,57%, 15% and 18% respectively.

Keywords:circular concrete filled double-skin steel tubular; axial load ratio; impact resistance; hollow ratio

∗山西省优青研究基金项目(201701D211006).

第一作者:郭志辉,硕士,主要从事组合结构和防灾减灾研究,Email:guozhihui95@ 163. com.

[引用本文] 郭志辉,王蕊,赵晖. 轴压比对圆中空夹层钢管混凝土抗撞性能的影响分析[ J]. 建筑结构,2023,53(12):36-42,73. GUO Zhihui,WANG Rui,ZHAO Hui. Influence analysis of axial load ratio on impact resistance ofcircular concrete filled double-skin steel tubular[J]. Building Structure,2023,53(12):36-42,73.