REINFORCEMENT RUPTURE IN THE STRUCTURAL FIRE DESIGN OF COMPOSITE SLABS

摘要

Composite floor slabs are one of the most widely used systems in modern construction.Understanding their performance in fire is fundamental to the application of many structural fire engineering techniques.Their performance is also key to both the structural stability of a floor plate, and the life safety strategy within many high and ultra-high rise buildings and is therefore worthy of continued analysis.This paper provides a discussion of the various approaches to the fire design of concrete composite floors and how they protect against reinforcement rupture and integrity failure.Fracture in the reinforcement is identified as an effective metric for checking for failure in finite element models of fully and partially protected structures.The sensitivity of this metric to element length is discussed and the necessity to factor the recorded cracking strain to calculate crack width is outlined.Three methods that can be used to calculate the permissible crack width and, therefore, used to check for reinforcement failure in a finite element models are discussed.This paper concludes that each technique is viable and that additional experimental research is required to support their application.