Parametric analysis of concrete-filled steel box connection by using 3-D finite element analysis

Abstract

The purpose of this study is to observe the effect of different parameters on the connection of steel box filled with concrete. The steel box is monolithically connected with steel beam, while a steel pile is inserted in the concrete. In order to develop the design method, effect of different parameters i.e. insertion length, material strength, box size, pile diameter and pile length were observed in the connection of steel box filled with concrete. After analysis, two types of failure mechanism were observed i.e. crushing of concrete and yielding of steel. Crushing of concrete dominant case takes place after the softening of concrete near the edge of pile. It was also observed that with the increase of concrete compressive strength the ultimate load of the connection varies non-linearly and with the increase of steel box size, ultimate capacity of the connection increases. Then it was found that by increasing the pile diameter the stress distribution around the pile increases, as a result, the ultimate load capacity of the connection increases. Then it was observed that for smaller pile length (outside of the steel box) shear force controls the failure but for longer pile moment controls the failure of the connection.