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Effect of bond length on the behaviour of CFRP strengthened concrete-filled steel tubes under transverse impact

机译：粘结长度对CFRP加固钢管混凝土横向冲击性能的影响

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摘要

Concrete-filled steel tubular (CFST) columns have shown great potential as axial load carrying member and used widely in many mission critical infrastructures. However, attention is needed to strengthen these members where transverse impact force is expected to occur due to vehicle collisions. In this work, finite element (FE) model of carbon fibre reinforced polymer (CFRP) strengthened CFST columns are developed and the effect of CFRP bond length is investigated under transverse impact loading. Initially the numerical models have been validated by comparing impact test results from literature. The validated models are then used for detail parametric studies by varying the length of externally bonded CFRP composites. The parameters considered for this research are impact velocity, impact mass, CFRP modulus, adhesive type, and axial static loading. It has been observed that the effect of CFRP strengthening is consistent after an optimum effective bond length of CFRP wrapping. The effect of effective bond length has been studied for above parameters. The results show that, under combined axial static and transverse impact loads CFST columns can successfully prevent global buckling failure by strengthening only 34% of column length. Therefore, estimation of effective bond length is essential to utilise the CFRP composites cost effectively. (C) 2015 Elsevier Ltd. All rights reserved.
机译：钢管混凝土（CFST）柱作为轴向承载构件已显示出巨大的潜力，并广泛用于许多关键任务的基础设施中。但是，需要注意加强这些部件，以防止由于车辆碰撞而产生横向冲击力。在这项工作中，建立了碳纤维增强聚合物（CFRP）增强CFST柱的有限元（FE）模型，并研究了横向冲击载荷下CFRP粘结长度的影响。最初，通过比较文献中的冲击试验结果对数值模型进行了验证。然后，通过改变外部粘结CFRP复合材料的长度，将经过验证的模型用于详细的参数研究。本研究考虑的参数是冲击速度，冲击质量，CFRP模量，胶粘剂类型和轴向静载荷。已经观察到，在最佳的CFRP包裹有效粘结长度之后，CFRP增强的作用是一致的。对于上述参数，已经研究了有效键长的影响。结果表明，在轴向静载荷和横向冲击载荷的共同作用下，CFST立柱仅通过加固立柱长度的34％即可成功防止整体屈曲失效。因此，有效结合长度的估计对于有效地利用CFRP复合材料至关重要。 （C）2015 Elsevier Ltd.保留所有权利。

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