2020 Volume 76 Issue 2 Pages I_289-I_300
This paper presents an analytical approach on the load carrying capacity of steel pipe beams with flange joints against boulder impact load by changing the impact position of the boulder. First, this proposed method was validated by comparing with the static and dynamic test results. Second, the load carrying capacities of steel pipe fix-ends beams with flange joints were investigated by comparing with the impact positions just above the flange joint (Type 1) with the one between flange joints (Type 2) using the elasticplastic FEM analyses under the static and impact condition. It was found that the case of ‘Type 1’ was more critical rather than ‘Type 2’ within the range of impact condition. This may be caused that ‘Type 1’ was not able to absorb the impact energy by the local deformation and dispated by the breaking energy of joint bolts. On the other hand, ‘Type 2’ was absorbed by the local deformation of a steel pipe and was not so critical than ‘Type 1’.
