火山渣混凝土梁高温后抗剪承载力可靠度分析  

Reliability analysis of shear capacity of volcanic scoria concrete beams after high temperature

作　　者：段文峰[1] 李丹[1] 蔡斌[1] DUAN Wenfeng;LI Dan;CAI Bin(School of Civil Engineering,Jilin Jianzhu University,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：《混凝土》2022年第5期78-83,共6页Concrete

基　　金：国家自然科学基金项目(51678274);国家重点研发计划项目(2017YFC0806100);吉林省教育厅“十三五”科学技术项目(JJKH20200279KJ);吉林省教育厅科学技术研究项目(JJKH20210279KJ)。

摘　　要：为得到高温后聚丙烯(PP)纤维火山渣混凝土梁抗剪承载力的可靠度指标变化规律,提出了一种PP纤维火山渣混凝土梁高温后抗剪承载力可靠度的分析方法。通过运用有限元软件ABAQUS和改进截面法计算得出高温后梁抗剪承载力,根据蒙特卡洛法的可靠度计算理论和极限状态下的功能函数,借助MATLAB工具编制程序计算得出火山渣混凝土梁的可靠度指标。研究结果表明,可靠度指标随着混凝土梁保护层厚度、截面尺寸、配箍率的增大而增大,随着荷载比的减小而增大。这一结果为后续开展高温后火山渣混凝土梁承载力性能试验研究提供参考依据。In order to obtain the change rule of the reliability index of the shear bearing capacity of polypropylene(PP)fiber volcanic slag concrete beams after high temperature,a method for analyzing the reliability of the shear bearing capacity of PP fiber volcanic slag concrete beams after high temperature was proposed.The finite element software ABAQUS and the improved section method are used to calculate the shear capacity of the beam after high temperature.According to the reliability calculation theory of the Monte Carlo method and the function function under the limit state,the volcanic slag concrete beam is calculated with the help of MATLAB tool programming.The reliability index.The research results show that the reliability index increases with the increase of the thickness of the protective layer of the concrete beam,the section size,and the hoop ratio,and increases with the decrease of the load ratio.This result provides a reference for the subsequent experimental research on the bearing capacity of volcanic slag concrete beams after high temperature.

关 键 词：火山渣混凝土 高温 强度折减 蒙特卡洛法 可靠度指标 

分 类 号：TU528.01[建筑科学—建筑技术科学]