Numerical analysis of compressive behavior of circular concrete filled steel tubular columns with high to ultra-high strength materials

H D Phan, Lien Kim Thi Dao
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Abstract

This paper presents a numerical analysis of the compressive behavior of short circular concrete filled steel tubular (CFST) columns having high to ultra-high strength materials under different compression loading cases. A matrix of thirty column specimens including CFST columns and empty steel tube ones was numerically investigated. Finite element model (FEMs) developed in ABAQUS were used to simulate these specimens, in which nonlinear tridimensional (3D ) finite elements were chosen for modeling both inner concrete core and outer steel tube. In this study, the materials of concrete and steel with compressive strength (f'c ) and yield strength ( fy) ranging from 100 to 120 MPa and from 525 to 595 MPa, respectively, were used. The CFST column specimens were concentric-compressively loaded by three cases, including entirely forcing on both the steel tube and concrete core (CFE), only forcing on the concrete core (CFC), and only forcing on the steel tube (CFS). Moreover, the empty steel tubes (EST) specimens were also compressively loaded. The numerical analysis results showed that the column’s mechanical behavior and load-carrying capacity mainly depend on the loading cases. In which, the CFC loading case leads to the highest load-carrying capacity and followed by the CFE loading case due to the confinement effect on the concrete core offered by the steel tube. Meanwhile, the CFS loading case results in the lowest load-carrying capacity of the CFST columns because the inner concrete core just keeps the outer steel tube more stable under compression loading compared to the EST loading case. Increasing the values of f'c and fy leads to a significant increase of the CFST column’s load-carrying capacity in cases of CFC and CFE.
高至超高强度材料圆钢管混凝土柱抗压性能数值分析
本文对具有高强度和超高强度材料的短圆钢管混凝土柱在不同压缩荷载工况下的抗压性能进行了数值分析。对包括钢管混凝土柱和空钢管柱在内的30个柱试件进行了数值研究。采用ABAQUS开发的有限元模型(fem)对试件进行模拟,其中混凝土内芯和外钢管均采用非线性三维有限元模型进行建模。本研究选用抗压强度f'c为100 ~ 120 MPa,屈服强度fy为525 ~ 595 MPa的混凝土和钢材材料。钢管混凝土柱试件分别受钢管和混凝土核心全部受力、混凝土核心仅受力和钢管仅受力三种情况的同心压缩加载。此外,空钢管(EST)试件也进行了压缩加载。数值分析结果表明,柱的受力性能和承载能力主要取决于荷载工况。其中,由于钢管对混凝土核心的约束作用,CFC承载能力最高,CFE承载能力次之。与此同时,CFS加载情况下,CFST柱的承载能力最低,因为与EST加载情况相比,内部混凝土核心只是使外部钢管在压缩荷载下更加稳定。在cffc和CFE情况下,增大fc和fy的值,CFST柱的承载能力显著提高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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