本文選題：Q鋼　切入點：蠕變試驗　出處：《建筑結(jié)構(gòu)學(xué)報》2016年11期

【摘要】：采用蠕變試驗機(jī)對低合金Q345鋼進(jìn)行高溫蠕變試驗,得到高溫下的蠕變曲線�；谠囼灁�(shù)據(jù)和現(xiàn)有蠕變模型,擬合得到Q345鋼復(fù)合時間強(qiáng)化蠕變模型和Norton蠕變模型。利用蠕變模型對Q345鋼柱的抗火性能進(jìn)行分析,得到高溫下Q345軸壓鋼柱承載力與受火時間關(guān)系曲線以及ISO 834標(biāo)準(zhǔn)升溫條件下鋼柱的荷載比和臨界溫度的關(guān)系。研究表明:Q345鋼在700~800℃斷裂前蠕變變形達(dá)到最大值;考慮蠕變后鋼柱受火初期的承載力隨受火時間的延長急劇降低,隨后趨于穩(wěn)定;ISO 834標(biāo)準(zhǔn)升溫條件下,荷載比在0.2~0.8內(nèi)考慮蠕變后鋼柱的失效臨界溫度降低60℃左右。
[Abstract]:The creep curves of low alloy Q345 steel at high temperature were obtained by creep test machine. Based on the experimental data and the existing creep model, the creep curves of Q345 steel at high temperature were obtained. The composite time hardening creep model and Norton creep model of Q345 steel were obtained by fitting. The fire resistance of Q345 steel column was analyzed by creep model. The relationship between bearing capacity and fire time of Q345 steel column at high temperature and the relationship between load ratio and critical temperature of steel column under ISO 834 standard temperature are obtained. The results show that the creep deformation of the steel reaches its maximum value before fracture at 700,800 鈩，

本文編號：1660855