高温后结构钢热变色试验  

Experiment on Thermochromism of Structural Steel After High Temperatures

作　　者：陈建锋[1] 周天华[1] 

机构地区：[1]长安大学建筑工程学院,陕西西安710061

出　　处：《建筑科学与工程学报》2013年第2期109-113,共5页Journal of Architecture and Civil Engineering

基　　金：中国博士后科学基金项目(2011M501428)

摘　　要：为了研究火灾后结构钢热变色的变化规律,对Q235结构钢加热至不同高温,再分别经历自然冷却、喷水冷却后采用Lab色差仪观测其热变色,由此提出了高温后钢材热变色Lab色度值的变化范围。结果表明:结构钢经不同高温冷却后,有显著热变色反应;冷却方式对结构钢热变色影响不显著,火灾温度是影响结构钢热变色的主要因素;高温后时效对热变色影响早期明显,3d后趋于稳定。本文研究成果可供火灾后钢结构损伤评估和加固分析时参考。In order to study the thermochromism properties of structural steel after fire, structural steel Q235 was heated to different high temperatures, and cooled in different ways, then the thermochromism of structural steel surface by Lab-type measuring color apparatus was observed. The variation range of Lab color values of steel thermoehromism after high temperatures was put forward. Results show that the structural steel presents thermochromism after cooling down from different high temperatures. Cooling method is not significant to thermochromism of structural steel, and the fire temperature is the main factor influencing the thermochromism of structural steel. After high temperatures, aging effect on thermochrornism obviously at the early stage, and three days later, it tends to be stable. The study results in the paper can provide reference for fire damage assessment and reinforcement analysis of steel structures after fire.

关 键 词：结构钢 高温 火灾后 热变色 Lab色度 

分 类 号：TU511.3[建筑科学—建筑技术科学]