高温环境下耐火钢Q235FRB力学性能试验研究
Experimental Investigation on Mechanical Properties of Fire-Resistant Steel Q235FRB at Elevated Temperature
张泽宇 1曾立静 1李红旭 2蒋录珍 3王月栋 1侯兆新 1李伟男4
作者信息
- 1. 中冶建筑研究总院有限公司,北京 100088;国家钢结构工程技术研究中心,北京 100088
- 2. 中冶建筑研究总院有限公司,北京 100088;河北科技大学建筑工程学院,石家庄 050018
- 3. 河北科技大学建筑工程学院,石家庄 050018
- 4. 中国京冶工程技术有限公司钢结构公司,北京 100088
- 折叠
摘要
为了研究耐火钢在高温环境下的力学性能,采用高温稳态试验方法进行耐火钢 Q235FRB 标准件的拉伸试验.基于试验结果,得到了不同温度条件下耐火钢 Q235FRB 的应力-应变曲线,据此给出了高温下耐火钢各项力学性能参数指标(包括弹性模量、屈服强度、抗拉强度)的折减系数.研究结果表明,耐火钢 Q235FRB 的强度指标(包括弹性模量、屈服强度、抗拉强度)与温度基本呈负相关关系,并提出了对应计算模型.当温度达到 400℃时,强度指标劣化速率加快,温度升至 800℃时,强度指标基本为常温性能的 10%.耐火钢 Q235FRB 的变形指标(极限伸长率)基本随着温度的升高呈先减小后增大的趋势.通过对比分析,耐火钢 Q235FRB 的力学性能和耐高温性能优于同等级普通钢,具有广泛应用前景.
Abstract
To investigate the mechanical properties of fire-resistant steel under elevated-temperature conditions,a steady-state method was used to conduct tensile experiments on standard specimens of fire-resistant steel Q235FRB.Based on the experimental results,stress-strain curves of fire-resistant steel Q235FRB under different temperature conditions were obtained,from which reduction factors for various mechanical performance parameters of fire-resistant steel(including elastic modulus,yield strength,and tensile strength)at elevated temperatures were obtained.The research results indicate that the strength parameters of fire-resistant steel Q235FRB(including elastic modulus,yield strength,and tensile strength)exhibit a negative correlation with temperature,and corresponding calculation models are proposed.When the temperature reaches 400℃,the degradation rate of strength parameters accelerates,with strength parameters reaching approximately 10%of room-temperature performance when the temperature rises to 800℃.The deformation parameter(ultimate elongation)of fire-resistant steel Q235FRB decreases first and then increases with the increase of temperature.Through comparative analysis,it is demonstrated that the mechanical and high-temperature resistance properties of fire-resistant steel Q235FRB surpass those of equivalent-grade ordinary steel,show casing promising application prospects.
关键词
耐火钢Q235FRB/高温环境/试验研究/力学性能Key words
fire-resistant steel Q235FRB/elevated-temperature environment/experimental research/mechanical properties引用本文复制引用
基金项目
济宁市重点研发计划"全球揭榜"项目(2022JBZP004)
中国中冶"181计划"重大研发项目(YJY2023kt01)
国家重点研发计划(2018YFC0705502)
出版年
2024
NETL
NSTL
万方数据