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Concrete-encased CFST members with circular sections under laterally low velocity impact: Analytical behaviour

机译:横向受低速冲击的圆形截面混凝土混凝土CFST构件:分析行为

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This paper reports an investigation into the impact resistance of concrete-encased concrete-filled steel tube (CFST) members with circular sections. A finite element analysis (FEA) model was established to simulate the impact behaviour of concrete-encased CFST under laterally low velocity impact, in which the strain rate effects of steel and concrete, the element erosion criteria of concrete, the interactions between concrete and steel, as well as the combined effects of axial load and lateral impact, were considered. Experimental data on reinforced concrete (RC), CFST and concrete-encased CFST members under drop hammer impact were used to verify the accuracy of the FEA model and a generally reasonable agreement was achieved for all three types of structures. A full-range analysis of the behaviour of concrete-encased CFST members with circular sections was then carried out with the FEA model to investigate the impact behaviour and impact resistance of the composite structure. The failure modes, sectional moment development, stress and strain development, as well as the contact behaviour between different parts were analyzed to highlight the reasons behind the good impact resistance of the composite structure. A parametric study was finally conducted with the FEA model to investigate the major parameters that may influence the impact resistance of the concrete-encased CFST members. (C) 2018 Elsevier Ltd. All rights reserved.
机译:本文报道了对圆形截面的钢管混凝土构件的耐冲击性的研究。建立了有限元分析模型,模拟了在低速侧向冲击下混凝土包裹的CFST的冲击行为,其中钢和混凝土的应变率效应,混凝土的元素侵蚀准则,混凝土与钢之间的相互作用考虑了轴向载荷和侧向冲击的综合作用。使用落锤冲击下的钢筋混凝土(RC),CFST和混凝土包裹的CFST构件的实验数据来验证FEA模型的准确性,并且对这三种类型的结构都达成了合理的协议。然后用FEA模型对带有圆形截面的混凝土包裹CFST构件的性能进行了全方位分析,以研究复合结构的冲击性能和抗冲击性能。分析了破坏模式,截面力矩发展,应力和应变发展以及不同零件之间的接触行为,以突出复合结构具有良好抗冲击性的原因。最后使用FEA模型进行了参数研究,以研究可能影响混凝土包裹CFST构件的抗冲击性的主要参数。 (C)2018 Elsevier Ltd.保留所有权利。

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