约束高强度Q460钢梁的抗火性能

Fire resistance performance on restrained high strength Q460 steel beams

为了研究约束高强度Q460钢梁的抗火性能,在已有约束钢梁分析理论的基础上,引入残余应力,提出了约束钢梁的抗火性能分析方法,并采用普通强度约束钢梁试验数据对分析方法进行了验证。考虑高强度Q460钢材高温下力学性能参数,利用所提出的方法分析了约束高强度Q460钢梁的抗火性能,并与普通强度Q345钢梁进行了对比。对影响约束高强度Q460钢梁的抗火性能参数进行了分析,包括荷载比、残余应力、轴向约束刚度、转动约束刚度和受火方式等。研究表明:所提出的分析方法准确可靠,高强度Q460钢梁抗火性能与普通强度钢梁具有较大的区别,高强度Q460约束钢梁的抗火性能明显优于普通强度约束钢梁。荷载比、轴向约束刚度、转动约束刚度、受火方式对高强度Q460约束钢梁有较大影响。

In order to study the fire resistance of restrained high strength Q 460 steel beam ,the residual stresses were introduced to analyze the fire resistance of restrained steel beam .The method was validated by experiment conductedon restrained mild steel beams .Fire resistance of restrained high strength Q 460 steel beams was analyzed and compared with that of restrained mild Q 345 steel beams and parameters affecting the fire resistance of restrained high strength Q460 steel beams were studied The parameters included load ratio ,residual stress ,stiffness of axial restraint ,stiffness of rotational restraint and fire exposure mode .The results showed that the innovative method proposedwas accurate and reliable ;the fire resistance of restrained high strength Q460 steel beam was much better than mild steel beam and the former .Load ratio ,stiffness of axial restraint ,stiffness of rotational restraint and fire exposure mode had significant influence on fire resistance of restrained Q 460 steel beam .