某工程火灾后结构安全分析

本文根据某污水处理厂蛋形消化池火灾过程，建立热传导数学模型。对火场持续时间、火场温度、混凝土的热容、混凝土的热导率、大气温度、混凝土表面热交换强度等参量进行合理取值，进行计算分析，得到不同深度、不同时刻混凝土的温度场。根据混凝土、钢筋和预应力钢绞线在不同持荷条件下的化学稳定性、热力学特性，实现蛋形消化池钢筋混凝土预应力结构的火灾损伤定量分析，为蛋形消化池的火灾结构安全鉴定提供理论依据。

Analysis of Structural Safety After Fire

On the basis of the processes of fire happened in some sewage treatment plants,by reasonably choosing parameters,e.g.,fire time,fire temperature,heat capacity of concrete,concrete thermal conductivity,air temperature,intensity of heat exchange of concrete surface,a model is established to obtain the temperature field of structure.According to chemical stability and thermodynamic properties of concrete,steel and pre-stressed strands under different temperature actions,an analysis of structure safety is carried out and numerical results coincide with conclusions drawn from tests after fire.The method provided is suitable for evaluation on structure safety after fire.