500MPa细晶粒钢筋高温下的应力-应变关系  

Stress-Strain Relationship of HRBF500 at High Temperatures

作　　者：肖建庄[1] 代媛媛[1] 赵勇[1] 程志军[2] 王晓峰[3] 

机构地区：[1]同济大学建筑工程系,上海200092 [2]中国建筑科学研究院科学技术处,北京100013 [3]中国建筑科学研究院建筑结构研究所,北京100013

出　　处：《建筑材料学报》2008年第3期276-282,共7页Journal of Building Materials

基　　金：国家高技术研究发展计划(863计划)资助项目(2004AA33G050)

摘　　要：通过拉伸试验,研究了20,200,300,400,500,600,700℃下500 MPa细晶粒钢筋屈服强度、极限强度、弹性模量、延伸率和受拉应力-应变关系的变化规律.结果表明,500MPa细晶粒钢筋屈服强度、极限强度以及弹性模量随温度的升高而逐渐下降,其屈服强度的变化规律与普通热轧钢筋有较大差异.基于试验数据,建议了高温下500 MPa细晶粒钢筋屈服强度、极限强度和弹性模量随温度变化的计算公式以及高温本构模型.The mechanical properties of hot rolled bars of fine grains（HRBF500） at high temperatures were studied experimentally.7 groups（21 specimens） were tested under temperatures of 20,200,300,400,500,600,700 ℃,respectively.The variation of yield strength,ultimate strength,elastic modulus,elongation and tensile stress-strain relationship of the HRBF500 at elevated temperatures were investigated and discussed.The results indicate that the yield strength,ultimate strength and elastic modulus of HRBF500 decrease gradually with raising temperatures,and are different from those of traditional hot rolled bars,especially for the yield strength.Based on experimental results,The calculation formulas for yield strength,ultimate strength,elastic modulus and tensile stress-strain relationship of hot rolled bars of fine grains at high temperatures are proposed.

关 键 词：细晶粒钢筋 高温 力学性能 受拉应力-应变关系 

分 类 号：TU528.571[建筑科学—建筑技术科学]