Size effects of deflection of concrete-filled circular steel tubular members under lateral impact

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (3) : 103-111.

LIU Yanhui1, CI Weizhu1,2, ZHAO Yichao1, WANG Luming1, XU Nan1, LIANG Jiayu1

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Abstract

Since most of the experimental studies on concrete-filled steel tubular members subjected to lateral impact are based on scaled tests, it is very important to satisfy the scaling law of impact. In this paper, based on the similarity criterion, the establishment of a similar model of concrete-filled steel tube subjected to lateral impact, determines the proportional relation between each parameter. On the basis of the model validation, the finite element model of concrete-filled steel tube under lateral impact was established using LS-DYNA, and size effect of deflection for concrete-filled steel tube under lateral impact was analyzed. The results show that the deflection size effect is small and the error is within 8% when members are not cracked. When members crack or fracture, the deflection size effect is obvious, and the error is more than 15%. Gravity, dynamic strength and fracture stress of materials are all factors that do not conform to the similarity criterion, and are also important reasons for the size effect of deflection for concrete-filled steel tube impact test. The deflection correction factor considering the size effect is proposed. The deflection in the large size prototype test can be predicted through the small size model test.

Key words

concrete filled steel tube / lateral impact / deflection / size effect / numerical simulation

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LIU Yanhui1, CI Weizhu1,2, ZHAO Yichao1, WANG Luming1, XU Nan1, LIANG Jiayu1. Size effects of deflection of concrete-filled circular steel tubular members under lateral impact[J]. Journal of Vibration and Shock, 2023, 42(3): 103-111

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