Abstract
The energy absorption characteristic of steel tube material and concrete material is an important indicator to reflect the impact resistance of circular concrete-filled steel tubular (CFST) members. In order to efficiently simulate the material energy absorption of the steel tube and concrete under lateral impact, a nonlinear finite element model considering the material strain rate of the circular CFST member was established and validated based on the drop weight tests. Then, the energy absorption mechanism of circular CFST members subjected to lateral impact was investigated including the revelation of the energy absorption process and the determination of the energy absorption distribution for the steel tube material and concrete material, which are obtained respectively based on the comprehensive analysis of dynamic response and innovative establishment of the segmented numerical model. In addition, the influence of impact momentum on energy absorption process and the effect of impact location on energy absorption distribution are further carried out. The observations of this investigation can provide reference for the anti-impact design and damage reinforcement of circular CFST members subjected to lateral impact.
Highlights
Concrete-filled steel tubular (CFST) members exhibit advantages of high strength and favorable ductility because of the collaborative force of steel tube and core concrete, which are widely applied to high-rise and long-span engineering structures [1,2]
In order to validate the accuracy of numerical simulation, three of the impact tests present in [5] were calculated through the finite element model established above, and the accuracy of finite element analysis was validated by comparing the simulation results of the impact force, the mid-span displacement, and the final damage mode with the test results
According to the damage pattern of the impacted CFST members shown in Table 1, it can be found that the damage of the CFST members was relatively serious at the impact location and the support areas, which indicates that the energy absorption distribution along the length for CFST members is non-uniform and non-linear
Summary
Concrete-filled steel tubular (CFST) members exhibit advantages of high strength and favorable ductility because of the collaborative force of steel tube and core concrete, which are widely applied to high-rise and long-span engineering structures [1,2]. Wang et al [5] conducted drop weight tests on circular CFST members under various impacts of kinetic energy, and investigated the effects of steel tube thickness and axial force on the dynamic response. Xian et al [19] analyzed the lateral impact performances of square steel-reinforced concrete-filled steel tubular members by drop weight tests, and the damage evolution, sectional stress, energy variation, and energy absorption distribution were discussed through the validated numerical models. The existing investigations above-mentioned have clarified the dynamic response and its simplified calculation method of impacted CFST members, but the energy absorption mechanism of circular CFST members under lateral impact has not been deeply investigated
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