Numerical simulation study on dynamic response of concrete-filled double-tube columns under coupled high temperature and impact

被引：0
|
作者：
Kong X. [1 ]
Zhang H. [1 ]
Zhang W. [1 ]
Fu Y. [1 ,2 ]
Zhang W. [1 ]
机构：
[1] Department of Civil and Architectural Engineering, Liaoning University of Technology, Jinzhou
[2] Songshan Lake Materials Laboratory, Dongguan
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2023年 / 42卷 / 10期
关键词：
concrete-filled double-tube (CFDT) columns; coupling effect; finite element analysis; high temperature; impact resistance;
D O I：
10.13465/j.cnki.jvs.2023.10.012
中图分类号：
学科分类号：
摘要：
To study the impact resistance of concrete-filled double-tube ( CFDT) columns at high temperature, a 3D finite element numerical model of CFDT columns under coupled high temperature and impact was established via ABAQUS, considering material softening temperature, strain rate of reinforcement effect and the influence of axial force. The results were verified by existing fire tests and lateral impact tests of CFDT columns at room temperature. On this basis, the dynamic response of CFDT columns at different temperatures was analyzed from the aspects of impact force, mid-span displacement, load distribution and damage evolution. Then, the effects of different section forms, axial compression ratio, impact velocity and concrete strength on the impact resistance of CFDT columns were considered. The results show that CFDT columns mainly exhibit bending failure under coupled high temperature and impact. With the increase of temperature, the impact resistance and flexural capacity of CFDT columns gradually decrease. The fire resistance of CFDT columns is 2. 1 times as much as that of normal concrete-filled steel tube columns. The axial force has a negative effect on the impact resistance of CFDT columns. When the axial compression ratio increases from 0 to 0. 6, the platform value of impact force decreases by 32. 4% at 800 °C. The concrete strength has significant influence on the impact resistance of CFDT columns at high temperature. When the concrete strength increases from 40 MPa to 60 MPa, the platform value of impact force increases by 22.8% at 800 °C. © 2023 Chinese Vibration Engineering Society. All rights reserved.
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页码：92 / 102+171
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