结构工程
消散
材料科学
弯曲
机械
栏(排版)
有限元法
纵横比(航空)
边值问题
数学
物理
复合材料
工程类
数学分析
连接(主束)
热力学
作者
Qihan Shen,Kexuan Li,Weifeng Zhu,Jingfeng Wang,Jingzhe Li
出处
期刊:Structures
[Elsevier]
日期:2023-12-01
卷期号:58: 105455-105455
标识
DOI:10.1016/j.istruc.2023.105455
摘要
To clarify the influence of gap imperfection on the impact behaviour of the concrete-filled steel tube (CFT) column, this paper performs numerical modelling on the mechanical responses of the circular CFT columns holding spherical-cap gaps (CCFT-SG) under lateral impact load. The effects of gap ratio, axial compression ratio, impact position, diameter/thickness ratio, boundary condition and material strength on the energy dissipation (Ea), the maximum (Fm) and equivalent impact forces (Feq), the peak (δm) and residual lateral deflections (δr) are analyzed after establishing and validating the finite element (FE) model. The typical failure pattern, time-history curve and contact response between the tube and concrete of the laterally impacted CCFT-SG column are revealed as well. The result declares that the overall failure morphology of the CCFT-SG column imposed with lateral impact showing as overall bending, is similar to that of the common CFT column, but distinct local depression is obtained because of the existence of spherical-cap gaps. With the gap ratio increasing, the Feq, Fm and Ea decrease gradually, while the δm and δr rise slowly. The calculation formulae for predicting the dynamic impact force and resistance of the CCFT-SG column are presented and validated against the existing test and numerical results.
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