高温后钢筋混凝土叠合梁抗剪承载力可靠度分析  

Reliability analysis of shear capacity of reinforced concrete composite beams after high temperature

作　　者：蔡斌[1] 郝丽妍 许龙飞 CAI Bin;HAO Li-yan;XU Long-fei(School of Civil Engineering,Jilin Jianzhu University,Jilin Changchun 130118,China)

机构地区：[1]吉林建筑大学土木工程学院,吉林长春130118

出　　处：《消防科学与技术》2020年第5期579-585,共7页Fire Science and Technology

基　　金：国家自然科学基金项目(51678274);住房和城乡建设部科学技术项目(2017—K9-047);国家重点研发计划项目(2017YFC0806100)。

摘　　要：提出了一种钢筋混凝土叠合梁在高温后斜截面和叠合面抗剪承载力可靠度的分析方法。选取钢筋混凝土(RC)梁的热工参数,应用ABAQUS进行热传导分析。基于热分析结果和RC叠合梁高温后抗剪承载力计算方法,得到斜截面和叠合面的剩余承载力。基于MATLAB应用蒙特卡洛法进行可靠度分析。结果表明,受热时间对可靠度的影响显著,可靠度指标随着混凝土强度、配箍率的增大而增大,随着荷载比的增加先增大后变化不明显。常温下RC叠合梁斜截面承载力可靠度大于叠合面,但随着加热时间的增加,叠合面的抗剪能力优于斜截面。该方法可以用于火灾高温作用后RC叠合梁承载力可靠度分析,具有较高的精度和准确性。A reliability analysis method of the shear capacity of the oblique section and the combined interface of the reinforced concrete composite beams after high temperature is provided.Firstly,the thermal parameters of reinforced concrete(RC)beams were selected,and the heat conduction analysis was performed using ABAQUS.Based on the thermal analysis results and the calculation method of the shear capacity of RC composite beams after high temperature,the residual bearing capacity of the oblique section and the combined interface after fire was obtained.Finally,based on MATLAB,Monte Carlo method was used to analyze the reliability.The results show that the heating duration has a significant effect on the reliability.The reliability index increases with the increase of the concrete strength and the stirrup reinforcement ratio.It increases first and then changes little with the increase of the load ratio.The reliability of the oblique section bearing capacity of RC composite beams is greater than that of the combined interface at room temperature,but with the increase of heating time,the shear strength of combined interface is better than that of the oblique section.This method can be applied to the reliability analysis of the bearing capacity of RC composite beams after high temperature,and has high precision and accuracy.

关 键 词：火灾 钢筋混凝土叠合梁 斜截面 叠合面 高温 可靠度 蒙特卡洛法 

分 类 号：X913.4[环境科学与工程—安全科学] TU375.1[建筑科学—结构工程]