Post-tensioned concrete slabs have been used in building and bridge structures throughout the world for several decades for the advantages of increased structural spans and reduced self-weight.However

its deformation and load carrying capacity will deteriorate once they are subjected to fire.Despite various experimental and theoretical investigations

there is relatively little work on fire-resistance parametric analyses for this kind of structures.This paper describes a detailed finite element analysis of unbonded post-tensioned simply-supported concrete slabs under fire using the package ABAQUS.All the structural components are modelled by solid elements with the exception of the reinforcing steel which is modelled by truss elements.The thermal and mechanical properties of the components of the model are taken from Eurocode EN 1992-1-2.The model is verified by comparing the numerical results of temperature field and deformation with available experimental results from the literature.The parameters of concrete expansion coefficient

different areas of slab subjected to fire

and different fire scenarios are taken into account to determine the deflection of slabs and tensile force of prestressing strands.The conclusions obtained can be referred to understand the behaviors of slabs under fire and conduct fire-resistant design.