1014 FRP パイプのボルト接合部における圧潰とエネルギ吸収特性の関係 : Integrated Crushing Experiment (ICE)

概要

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Energy absorption properties of FRP pipe jointed to steel column by bolts were evaluated in this study. Different three cases were examined to clarify the effects of bolt diameter and the number of bolt on energy absorption properties of bolt jointed FRP pipe. In one case progressive crushing, in which load value indicates approximately constant values and fractured regions expand in circumferential direction, occurred at the tip of FRP pipe without no fracture at the bolt jointing region. On the contrary, buckling fracture occurred around boltholes or shear fracture occurred at bolts in other two cases. In order to make sure that progressive crushing always occur at the tip of FRP pipe we assumed a hypothesis, that is progressive crushing occurs when applied stresses on bolt jointing regions do not exceed material strength, and also proposed the equations in order to decide the combination of bolt diameter and the number of blots. Then the actual fractural phenomena could be explained by these equations in all experimental cases. There fore, it is possible to find out suitable condition to bolt-jointed FRP pipe to always create progressive crushing at the tip region of pipe without any fractures at bolts or boltholes, and also it enables application of bolt-jointed FRP pipes to the energy absorption components.
社団法人日本機械学会の論文