Experimental and numerical study on post-fire behaviour of concentrically loaded reinforced reactive powder concrete columns

摘要

This paper presents an experimental and numerical work on the behaviour of concentrically loaded reinforced reactive powder concrete (RPC) columns after exposure to fire. The first part is an experimental work to ensure that the model developed is adequate while the second part is a three-dimensional finite element (FE) modelling of the RPC columns with the program ABAQUS using a sequentially coupled thermal displacement analysis. Fire-induced spalling is also presented based on pore pressure calculations in concrete. The test results indicated that RPC columns lost about (39-45%) of their bearing capacity after fire exposure at 600 degrees C and with 1 h fire duration. Increasing concrete cover and introducing lateral ties are shown to barely improve the post-fire behaviour of RPC columns. Moreover, the reduction in the residual bearing capacity increased significantly with increasing the number of sides of the exposure and fire duration. (C) 2018 Elsevier Ltd. All rights reserved.