桥面火灾全过程的多梁式混凝土T梁桥整体变形  

Deformation for Multi-beam Concrete T Girder During Deck Fire

作　　者：王翠娟[1] 贺拴海[1] 张岗[1] 

机构地区：[1]长安大学交通行业旧桥检测与加固重点试验室,西安710064

出　　处：《武汉理工大学学报》2012年第9期100-103,共4页Journal of Wuhan University of Technology

基　　金：国家交通运输部西部交通建设科技项目(2011812318970);中央高校基本科研业务专项资金(CHD2011ZY003)

摘　　要：推导了多梁式T梁桥多区域跨中桥面受火模式计算函数,分析了各片梁肋跨中断面横桥向变形规律。结果表明:随延火时间增加,混凝土T梁顶板顶层的温度由浅波浪状逐渐交融呈层状扩展;延火前后期时间分界点为80min;延火前期中肋的上挠量大于两边肋的上挠量;延火后期两边肋下挠大于中肋下挠,梁体横桥向呈上凸横曲现象。calculation function of multi-range deck fire was deduced,mid-span transverse deflection of each beam was analyzed.The studied results indicate： with increment of fire time,temperature distribution for the upper floor is gradually from interval to melt,then present a layer expansion;the division of fire anaphase and fire prophase is 80 minutes;deflection of beam in fire anaphase has an linear decrease;the upper arch value of mid rib is bigger than the upper deflection of brim rib during fire prophase,the deflection of mid rib is smaller than the deflection of brim rib during fire anaphase,the transverse of beam present an overhead phenomenon.

关 键 词：桥梁工程 多梁式T梁桥 火灾 变形 

分 类 号：U44[建筑科学—桥梁与隧道工程]