高强钢S460和S690火灾后力学性能试验

发布时间：2018-02-23 01:17

  本文关键词： 高强钢 火灾后 力学性能 剩余系数 预测公式　出处：《哈尔滨工业大学学报》2017年02期 　论文类型：期刊论文

【摘要】：火灾后,材料力学性能的退化是导致钢结构火灾后承载力降低的主要因素.通过试验研究高强钢S460和S690过火冷却至常温后的力学性能,得到过火高温对高强钢S460和S690的弹性模量、屈服强度、极限强度及应力-应变曲线的影响规律,并与普通钢火灾后力学性能进行对比.结果表明,当过火温度低于600℃时,S460和S690冷却后可恢复其基本力学性能;当过火温度超过600℃后,甚至高达1 000℃时,高强钢S460仍可恢复其常温下75%以上的力学性能,而S690仅可恢复其常温下64.5%的弹性模量、38.1%的屈服强度及57.3%的极限强度;高强钢火灾后力学性能与普通钢不同.通过对试验数据进行数值拟合,给出可准确表达S460和S690火灾后力学性能剩余程度的预测公式,可用于指导含高强钢S460和S690构件的钢结构火灾后检测与鉴定,并为相关规范的修订提供参考依据.
[Abstract]:The degradation of mechanical properties of materials after fire is the main factor leading to the reduction of the bearing capacity of steel structures after fire. The mechanical properties of high strength steel S460 and S690 after overfire cooling to normal temperature are studied through experiments. The effects of overfire and high temperature on the elastic modulus, yield strength, ultimate strength and stress-strain curves of high strength steel S460 and S690 were obtained. The basic mechanical properties of S460 and S690 can be recovered after cooling when the overfire temperature is lower than 600 鈩，

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