张茂林;杜红秀;陈良豪;陈尧;贺一轩;

• 1:太原理工大学建筑与土木工程学院

摘要(Abstract)：

为了解不同受火温度后不同冷却方式下钢筋物理力学性能的变化,试验测试了HRB400钢筋在不同受火温度及喷水、自然和炉内3种冷却方式冷却后钢筋的屈服强度、抗拉强度、断后伸长率、断面收缩率等参数的变化情况,并采用无损红外热像检测技术对高温后不同冷却方式的钢筋进行了红外图谱分析。结果表明:高温后钢筋的力学性能变化规律与钢筋的受火温度和冷却方式有关,其中炉内冷却和自然冷却的力学性能变化规律相近,而喷水冷却变动较为剧烈;随着钢筋受火温度的升高,红外平均温升提高,受火温度低于700℃时,冷却方式对受火钢筋的红外平均温升影响不大,受火温度高于700℃时,喷水冷却对红外平均温升影响较大;基于试验数据建立了钢筋红外平均温升与受火温度、屈服强度比和抗拉强度比关系的拟合公式,可用于火灾后HRB400钢筋的承载能力的评估。

关键词(KeyWords)： HRB400钢筋;高温冷却;力学性能;红外热像

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(51278325)

作者(Author): 张茂林;杜红秀;陈良豪;陈尧;贺一轩;

Email:

DOI:

参考文献(References)：

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