Finite Element Analysis of Concrete Frames after Fire with Fiber Model

Abstract

In order to analyze the residual mechanical properties of concrete frame structures after fire, a novel numerical model considering the distribution of non-uniform temperature in the cross-sections of structural members and the changing of mechanical properties of materials damaged by fire is developed in this paper by dividing the cross-sections of structural members into a lot of concrete fibers and steel fibers based on the concept of fiber model. Besides, the Analytical System of Fire-damaged Concrete Frame (ASFCF) is established through the secondary development of ABAQUS Software that is completed by the programming language of Python. This system is used to analyze the temperature fields and the nonlinear mechanical performances of a multi-story, multi-span, three-dimensional concrete frame after fire. The results indicate that ASFCF can properly analyze the mechanical properties of concrete frames after fire, and it provides valuable references for assessing the residual mechanical properties of concrete frames after fire.

Experimental study on seismic performance of post-fire reinforced concrete frames

“…Furthermore, the bearing capacity decreased to 57.3% when the temperature exceeded 1000 °C. Xia et al [30] proposed a fibre element model based on ABAQUS to analyse the residual bearing capacity of three-dimensional (3D) RC frames after fire exposure, the numerical model considers the distribution of non-uniform temperature in the crosssections of structural members and the changing of mechanical properties of materials damaged by fire.…”