Numerical study on the residual axial capacity of ultra high performance cementitious composite filled steel tube (UHPCC-FST) column under contact explosion
Numerical study on the residual axial capacity of ultra high performance cementitious composite filled steel tube (UHPCC-FST) column under contact explosion
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DOI：
10.1016/j.tws.2020.106832
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发表时间：
2020-08
影响因子：
6.4
通讯作者：
Z.G. Wang;Hsin Wei Wu;Q. Fang;J. Wu
中科院分区：
文献类型：
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作者：
Z.G. Wang;Hsin Wei Wu;Q. Fang;J. Wu
钢管超高性能胶凝复合材料柱作为大跨桥梁的承载构件，是恐怖活动中潜在的炸弹爆炸袭击目标，已得到广泛应用。在作者的前期工作中，对uhpc - fst试件在接触爆炸作用下的残余轴向承载能力进行了实验研究，并进行了相应的数值模拟研究。利用LS-DYNA有限元程序中实现的多材料任意拉格朗日-欧拉（ALE）算法、流固耦合（FSI）法、重启输入数据法和单元侵蚀算法，对接触装药爆炸及后续轴压试验进行了数值模拟。通过与实验数据的对比，再现了uhpc - fst试件的损伤和破坏模式。进一步讨论了钢管厚度和强度、核心混凝土抗压强度、柱径等相关参数对uhpc - fst试件接触爆轰作用下局部爆坑深度、爆后残余轴向承载力及相应损伤指标的影响。阐明了上述参数对uhpc - fst试样接触爆炸残余轴向承载力的影响程度。本文的研究可为UHPCC-FST试样在接触爆炸作用下的爆后性能评价和设计提供有益的参考。
Ultra high performance cementitious composites filled steel tube (UHPCC-FST) column has been widely applied as the load bearing members for long-span bridges, which are the potential bomb explosion attacking targets in terroristic activities. In the authors’ previous work, the residual axial load bearing capacity of UHPCC-FST specimens under contact explosion was investigated experimentally, and this paper further perform the corresponding numerical simulation study. By utilizing the multi-material Arbitrary Lagrange-Euler (ALE) algorithm, Fluid-Structure Interaction (FSI) method, the restart input data method and element erosion algorithm implemented in the finite element (FE) code LS-DYNA, the numerical simulations corresponding to the contact charge explosion and the following axial compression tests are carried out. The damage and failure modes of UHPCC-FST specimen are reproduced and validated by comparing with the experimental data. Furthermore, the related parametric influences, e.g., thickness and strength of steel tube, compressive strength of core concrete and column diameter, on the local blast formed crater depth, the post-blast residual axial load bearing capacity, as well as the corresponding damage index of UHPCC-FST specimen under contact detonation are discussed. The influential degree of above parameters on the residual axial capacity of UHPCC-FST specimen under contact explosion is clarified. The present work can provide helpful references for evaluating the post-blast performance as well as the design of UHPCC-FST specimen under contact explosion.