高温后预应力钢筋和非预应力钢筋的力学性能  

Mechanical properties of prestressing steel wire and non-prestressed steel bar after elevated temperature experience

作　　者：经建生[1] 侯晓萌[2] 郑文忠[2] 

机构地区：[1]公安部天津消防科学研究所,天津300381 [2]哈尔滨工业大学土木工程学院,哈尔滨150090

出　　处：《吉林大学学报（工学版）》2010年第2期441-446,共6页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(50678050);黑龙江省杰出青年科学基金项目(2001-8)

摘　　要：为考察高温后预应力钢筋及非预应力钢筋的力学性能,砸碎38个火灾后预应力混凝土梁板试件,取出预应力钢筋及非预应力钢筋,制作成481个预应力钢筋试件和489个非预应力钢筋试件,并对这些试件进行高温后的力学性能试验。基于试验结果,探索了高温后预应力钢筋和非预应力钢筋的相关强度、弹性模量、断后伸长率等的变化规律,给出了高温后预应力钢筋及非预应力钢筋的应力-应变曲线方程,可用于预应力混凝土结构抗火性能研究。试验结果表明,在经历相同的温度作用后,经历高温下应力历程的预应力钢筋较未经历高温下应力历程的预应力钢筋的强度略低,而非预应力钢筋的强度受高温下应力历程的影响不大。38 prestressed concrete slabs and beams after the elevated temperature experience were smashed and 481 tensile test specimens from the prestressing steel wire and 489 from non-prestressed steel bar were prepared to investigate the mechanical properties of these materials after the elevated temperature experience.The specimens were tested on mechanical properties,and the change behaviors of their related strength,elastic modulus,and specific elongation at rupture,as well as their stress-strain curves were obtained.The results can be used to analyze the fire resistance of the prestressed structures.The test results show that the strength of the prestressing steel wire after the elevated temperature experience is a little lower than that of wire without this experience,but for the non-prestressed steel bar,the elevated temperature experience has hardly effect on its strength.

关 键 词：土木工程 预应力钢筋 非预应力钢筋 力学性能 

分 类 号：TU378.5[建筑科学—结构工程]