Calculation method of the deflection of circular concrete filled steel tubular members under transverse impact load

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (19) : 286-294.

LIU Yanhui1， ZHAO Yichao1， CI Weizhu1,2， WANG Zhe1， WANG Luming1，ZHU Wenkai1， HAN Daguang3

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Abstract

In order to investigate the deflection of circular concrete-filled steel tubular (CFST) members subjected to transverse impact at any position, a theoretical formula for calculating the deflection of the members was derived based on the rigid-plastic assumption. The deflection test data of 55 CFST members under lateral impact were selected as statistical samples, and the correction factor was then obtained to correct the error caused by the difference between the rigid plastic hypothesis and the actual situation such as energy loss and local deformation. The applicable scope of the modified formula is: impact mass between 193.35 and 920.00 kg, impact velocity between 3.96 and 14.48 m/s. for sensitive factor, when both ends are fixed, the confinement factor is between 0.500 and 2.0; when the two ends are simply supported, the confinement factor is between 0.500 and 1.617; when the ends are fixed and simply supported, the confinement factor is between 0.500 and 1.307. The samples were expanded by means of numerical simulation to verify the accuracy of the formula, and the results of the formula were compared with those of simulation. The results show that the proposed modified formula exhibits reasonable accuracy with errors within 10%.

Key words

concrete filled steel tube(CFST) / transverse impact / deflection / theoretical derivation / correction factor

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LIU Yanhui， ZHAO Yichao， CI Weizhu， WANG Zhe， WANG Luming，ZHU Wenkai， HAN Daguang. Calculation method of the deflection of circular concrete filled steel tubular members under transverse impact load[J]. Journal of Vibration and Shock, 2021, 40(19): 286-294

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