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 atElevated Temperature

作　　者：张泽宇 曾立静 李红旭 蒋录珍[2] 王月栋 侯兆新[1,3] 李伟男 Zeyu Zhang;Lijing Zeng;Hongxu Li;Luzhen Jiang;Yuedong Wang;Zhaoxin Hou;Weinan Li(Central Research Institute of Building and Construction Co.,Ltd.,MCC Group,Beijing 100088,China;School of Civil Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China;National Steel Structure Engineering Technology Research Center,Beijing 100088,China;Steel Structure Branch,China Jingye Engineering Technology Co.,Ltd.,Beijing 100088,China)

机构地区：[1]中冶建筑研究总院有限公司,北京100088 [2]河北科技大学建筑工程学院,石家庄050018 [3]国家钢结构工程技术研究中心,北京100088 [4]中国京冶工程技术有限公司钢结构公司,北京100088

出　　处：《钢结构（中英文）》2024年第10期111-118,共8页Steel Construction（Chinese & English）

基　　金：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)。

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。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 

分 类 号：TU511.3[建筑科学—建筑技术科学]