Research on vertical bearing capacity of circular concrete filled winding GFRP tubular columns after lateral impact

摘要

Sixty-three circular concrete filled winding glass fibre reinforced plastic (GFRP) tubular columns after lateral impact damage were tested, which were used to investigate the behaviour of circular concrete filled winding GFRP tubular (CFWGT) columns under compressive loading in this paper. The influence of the thickness of the GFRP tube, the height of the lateral impact and the location of the lateral impact on the mechanical properties of the specimens were analyzed. Test results show that the lateral impact had a negative impact on the vertical bearing capacity of the circular CFWGT column. As the height of the lateral impact increased, the vertical bear-ing capacity and initial stiffness of the specimens decreased. When the position of the lateral impact is closer to the end of the specimen, the lower the vertical bearing capacity and initial stiffness of the specimen are. The negative effects of lateral impact on the vertical bearing capacity and initial stiffness of CFWGT columns can be reduced by increasing the GFRP tube thickness. According to the test results, the calculation formula, which was based on a mechanics calculation model, was presented to calculate the vertical capacity of circular CFWGT columns after lateral impact.