含钢率对混凝土截面温度场分布的影响  

Influence of Steel Ratio on the Temperature Field Distribution of Concrete Section

作　　者：杨清文[1] 徐玉野[1] 郑涌林[1] 罗漪[1] 

机构地区：[1]华侨大学土木工程学院,福建厦门361021

出　　处：《华侨大学学报（自然科学版）》2012年第1期89-93,共5页Journal of Huaqiao University(Natural Science)

基　　金：国家自然科学基金资助项目(50908091);中国博士后科研基金面上项目(20100480756);福建省自然科学基金资助项目(2009J01256);亚热带建筑科学国家重点实验室开放课题(2009KB18);福建省高校杰出青年科研人才培育计划项目(JA10005);国务院侨办科研基金资助项目(10QZR09);华侨大学基本科研业务费专项基金资助项目(JB-SJ1011)

摘　　要：将钢筋的圆形截面等效为面积相等的方形截面,采用四边形单元建立配置钢筋、型钢的混凝土截面的二维温度场分析模型,分析纵筋配筋率、型钢含钢率对混凝土截面温度场分布的影响.算例计算结果表明:钢筋对截面温度场分布计算结果影响较小,钢筋的存在使保护层内混凝土的温度降低,核心混凝土的温度升高,忽略钢筋对截面温度场分布的影响是合理的.型钢对截面温度场分布的计算结果影响较大,受火180min内混凝土截面内型钢翼缘中心处和截面形心处温度计算结果最大分别相差17.1℃和98.7℃;高温下型钢混凝土构件的抗火性能研究中,需要考虑型钢对截面温度场分布的影响;型钢混凝土构件火灾灾后性能评定中,核心型钢的力学性能可基本恢复.The circular section of steel bar is equivalent to a square section with the same area,and the analytical model for two-dimensional temperature field of concrete section with steel bar or shaped steel was established using quadrangular element.Then the influence of the steel ratio of longitudinal reinforcement and shaped steel on the temperature field distribution was investigated.The results of numerical examples show that： the influence of reinforcement ratio on the temperature field distribution of concrete section is little and is neglectable.The temperature of cover concrete is decreased by reinforcement while that of core concrete is increased.The shaped steel ratio has great influence on the temperature field distribution of concrete section.When the fire exposure time is 112 min,the temperate differences at the center of flange and the centroid of cross section are 17.1 ℃ and 98.7 ℃,respectively.It is necessary to consider the influence of shaped steel on the temperature field distribution in the fire resistance analysis of steel reinforced concrete（SRC） members under elevated temperature.The mechanical behaviour of core shaped steel can mostly be recovered in the residual strength evaluation of SRC members.

关 键 词：混凝土 温度场 含钢率 影响规律 抗火性能 

分 类 号：TU375.3[建筑科学—结构工程]