Behaviour of thin walled composite beams and columns

摘要

The behaviour of TWC beams and columns with normal concrete (NC) and light weight volcanic pumice concrete (VPC) as in-fill, is described based upon experimental results. The capacity of the column is found to be enhanced due to the increased strength of confined concrete and increased steel plate buckling capacity resulting from composite action. It is found that the TWC columns of strength comparable to NC, can be manufactured using VPC in-fill. The columns may fail due to tearing of steel plate or local plastic yielding of steel plate due to the formation of local buckles or global buckling, depending on the plate thickness and slenderness of the columns. The strength of the beam is limited by the compression buckling capacity of the steel plate at the top of the open box section. The performance of the beam and enhancement of the strength of the beam can be possible by stiffening the compression steel plates at the open end of box section. The improved performance of the VPC in confined environment demonstrates the potential of using volcanic pumice (VP) as light weight aggregate in this form of construction.