DYNAMIC RESPONSE ANALYSIS METHOD FOR THE PEAK VALUE STAGE OF CONCRETE-FILLED STEEL TUBE BEAMS UNDER LATERAL IMPACT

摘要

This paper proposes a dynamic response analysis method of concrete-filled steel tube (CFST) beams at the peak value stage under lateral impact load. Targeted calculation of the peak value stage, finite element analysis (FEA) was carried out to determine the calculation model suitable for the analysis of the peak value stage and the simplified trend curve of beam acceleration at the impact point. Then, an analysis method for calculating the dynamic response of a fixed-fixed supported CFST beam is proposed, which consists of the travelling hinge theorem and a prediction model of the simplified trend curve. The predicted simplified trend curve is applied to replace the motion constraint assumption of the impactor and beam in the travelling hinge model. In the meantime, the elastoplastic behaviour of the CFST beams is considered in the analysis process. Through the comparison of experimental results and analysis results, this analysis method can predict the time history curves of the acceleration and impact force of CFST beams reasonably. Copyright (C) 2019 by The Hong Kong Institute of Steel Construction. All rights reserved.