火山渣混凝土梁受火后抗弯承载力可靠度分析  

Reliability analysis on flexural capacity of post-fire scoria concrete beams

作　　者：蔡斌[1] 张博[1] 曹祥扩 李博[1] CAI Bin;ZHANG Bo;CAO Xiang-kuo;LI Bo(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

出　　处：《消防科学与技术》2019年第6期874-879,共6页Fire Science and Technology

基　　金：国家自然科学基金项目(51378238,51678274);住房和城乡建设部科学技术项目(2017-K9-047)

摘　　要：为了研究火山渣混凝土梁受火后抗弯承载力可靠度变化规律,提出基于改进截面法的钢筋混凝土梁受火后抗弯承载力计算方法。对火山渣混凝土受火后力学性能进行了试验测定,应用ABAQUS对钢筋混凝土梁受火后温度场分布进行数值模拟,应用蒙特卡洛方法进行可靠度分析。计算结果表明,随着荷载效应比和受火时间的增加、混凝土保护层厚度的降低,受火后钢筋混凝土梁的抗弯承载力可靠度明显下降,且火山渣混凝土梁受火后抗弯承载力可靠度高于普通混凝土梁。分析结果为火山渣混凝土梁受火后的力学性能研究提供参考。In order To study the regularity of flexural capacity reliability of post-fire scoria concrete beams,the strength reduction model of post-fire reinforced concrete beams based on improved sectional method was proposed.The mechanical properties of postfire scoria concrete were tested,and the temperature field distribution of post-fire scoria concrete beams were simulated by software ABAQUS,then the reliabilities were calculated by Monte-Carlo method.The results showed that the flexural capacity reliability index of post-fire RC beams declined with the increment of load effect ratio or fire exposure time,but increased with the rise of concrete cover thickness.The reliability of flexural capacity of postfire scoria concrete beams is higher than that of ordinary concrete beams.The results of numerical examples provide references to the mechanical performance analysis of scoria concrete beams.

关 键 词：火山渣混凝土 受火 改进截面法 可靠度指标 蒙特卡洛方法 

分 类 号：X913.4[环境科学与工程—安全科学] TU528[建筑科学—建筑技术科学]