Analysis of Circular Concrete-Filled Steel Tube Specimen under Lateral Impact

Abstract

This paper mainly discusses the derivation and usage of simplified analysis model of circular concrete-filled steel tube specimen under lateral impact. At first, the robust software, LS-DYNA, is employed in this paper to simulate a test of circular concrete-filled steel tube (CFT) specimen under drop impact carried out by Li (2007). The numerical simulations results agree well with the experiment results and it shows good prediction of dynamic response of the CFT specimen under lateral impact could be achieved. Further analysis based on LS-DYNA model is then made to investigate the stain rate effect of the CFT column with fixed-simple supported ends. At last, a simplified analytic model is derived based on the combination of the tests results, the numerical simulation and theoretical analysis. The comparison between the maximum deflections at the mid-span obtained from the proposed simple analytical model and the numerical simulation shows that the proposed method gives good predictions of the maximum deflection of the CFT specimen under lateral impact.

Deflection Calculation Based on SDOF Method for Axially Loaded Concrete-Filled Steel Tubular Members Subjected to Lateral Impact

“…e concrete material is modeled with MAT_CON-CRETE_DAMAGE_REL3 of LS-DYNA in this paper. e reliability and accuracy of this concrete model have been demonstrated in previous investigations [12,[39][40][41][42]. e strain rate effects of concrete material are typically reflected by the dynamic increase factor (DIF).…”

Dynamic Response Analysis Method for the Peak Value Stage of Concrete-Filled Steel Tube Beams Under Lateral Impact

“…Additionally, the properties of concrete followed the concrete damage model (MAT_72R3 in LS-DYNA) developed by Malvar et al [34]. This concrete model has also been successfully applied to analyse the behaviours of CFST beams under lateral impact [23,27,31], which includes three independent surfaces (the initial yield surface, the maximum failure surface, and the residual failure surface) to describe the elastic-plastic response of the concrete [33,34].…”

“…Based on this feature, it can be assumed that the value of ab is approximately a constant during the acceleration process. Besides, as the b V and I V curves stay close and share the similar trend in the deceleration process, it can be assumed that  Ib VV in this process, which is also a general supplementary condition in the analysis calculations [15][16][27][28][29][30], while not suitable at the peak value stage. The supplementary condition of the acceleration process is suggested to be the simplified acceleration time history curve (i.e., the simplified trend curve), as shown in Fig.…”

“…The CFST beam dynamic response process obtained from lateral impact tests [23][24][25][26] also includes the peak value stage, the platform stage, and the unloading stage. However, there are several methods for calculating the platform stages in CFST beams [27][28][29][30], whereas those for the peak value stage are rare. Only the analytical calculation performed by Wang et al [31] includes the peak value stage.…”

Experimental behaviour of concrete-filled steel tubes under cyclic axial compression

“…Different loading conditions were employed to investigate the mechanical behaviour of CFST: static load (Dundu, 2012;Van Cao, 2019;Yang and Han, 2012), lateral cyclic load (Liu et al, 2018;Yang et al, 2009), impact load (Han et al, 2014;Qu et al, 2011;Xiao et al, 2009), load and thermal effects (Han et al, 2008;Song et al, 2010;Yin et al, 2006). However, in the literature, research on the behaviour of CFST under cyclic axial compression seems to be quite limited to a few studies (Aly et al, 2010a(Aly et al, , 2010bThayalan et al, 2009).…”