Calculation method of the deflection of circular concrete filled steel tubular members under transverse impact load
LIU Yanhui1， ZHAO Yichao1， CI Weizhu1,2， WANG Zhe1， WANG Luming1，ZHU Wenkai1， HAN Daguang3
1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China；
2. Anhui Transport Consulting and Design Institute Co., Ltd., Hefei 230088, China；
3. Department of Civil Engineering and Energy Technology Faculty of Technology, OsloMet-Oslo Metropolitan University, Oslo 0166, Norway
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%.
刘艳辉，赵一超，慈伟主，王喆，王路明，朱文凯，韩达光. 横向冲击下圆钢管混凝土构件挠度计算方法研究[J]. 振动与冲击, 2021, 40(19): 286-294.
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. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(19): 286-294.
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