截面温度不均匀受约束波纹腹板梁悬链线效应参数分析  

Parameter Analysis for Catenary Action of Restrained Corrugated Web Steel Beam with Non-Uniform Section Temperature Distribution

作　　者：陈恒超[1] 刘昌斌[2] 

机构地区：[1]遵义职业技术学院,贵州遵义563000 [2]山东大学土建与水利学院,济南250061

出　　处：《建筑钢结构进展》2017年第4期63-71,97,共10页Progress in Steel Building Structures

摘　　要：利用经试验验证的有限元模型对均匀温度和不均匀温度分布下轴向约束波纹腹板梁的悬链线效应进行了参数分析,选取荷载比、轴向约束刚度比、跨高比及倾角为主要参数,研究了钢梁的跨中挠度、梁端轴力和悬链线弯矩等随温度的变化规律,并给出了火灾下钢梁的临界温度。由于不均匀温度下产生的热弯曲,钢梁在压力阶段的挠度更大而轴力更小。但均匀温度下钢梁的破坏温度比不均匀温度情况时高。钢梁的悬链线温度和破坏温度都随着荷载比的增大而降低。相同荷载比作用下,不同跨高比钢梁的悬链线温度相同,但其破坏温度随跨高比的增大而升高,钢梁的悬链线效应也越明显。Parametric studies on catenary action of restrained corrugated web steel beams（CWSBs）with both non-uniform temperature distribution（NUTD）and uniform temperature distribution（UTD）across the section in a fire were carried out through the verified finite element model.Studied parameters included the load ratio,the axial restraint stiffness ratio,the span-depth ratio and incline angle of the corrugated web.The change law of vertical deflection,axial force and catenary action moment with the elevated temperatures were presented.Critical temperatures of the beam in the fire were also given.Larger vertical deflection and smaller axial force were generated in the restrained CWSB with NUTD in compression stage for thermal bowing.But the failure temperature of the restrained CWSB with UTD was much higher than that with NUTD.Catenary temperature and failure temperature of restrained CWSBs were both decreased with the increase of load ratio.Under the same load ratio,catenary temperatures of CWSBs with different span-depth ratios were nearly the same.However,CWSBs with greater span-depth ratio had a much higher failure temperature,which meant that the restrained CWSB with greater span-depth ratio developed catenary action easily.

关 键 词：波纹腹板梁 轴向约束钢梁 火灾 不均匀温度分布 悬链线效应 临界温度 

分 类 号：TU352.5[建筑科学—结构工程]