火灾下PC多肋T型梁桥面平整度分析  

Analysis of Deck Roughness for Pre-stressed Concrete Multi-beam T-shaped Girder Bridge Exposed to Fire

作　　者：张岗[1] 贺拴海[1] 刘扬[1,2] 王翠娟[3] 周敉[1] 

机构地区：[1]长安大学公路学院,西安710064 [2]贵州省交通运输厅,贵阳550000 [3]长安大学工程机械学院,西安710064

出　　处：《武汉理工大学学报》2014年第7期96-101,共6页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(51308056);国家交通运输部交通建设科技项目(2011812318970);中央高校基本科研业务费专项资金资助项目(2014G2210003;2013G2211004)

摘　　要：给出了火灾下预应力混凝土多肋T型梁桥的火灾模型和有限元建模计算方法,分析了火灾下预应力混凝土多肋T型梁桥延火变形,揭示了其桥面平整度的变化规律。结果表明,整个延火过程中,受火梁体均由反拱状态逐渐下挠,对称边肋受火,桥面呈倒"U"型,对称中肋受火,桥面呈"V"型,4片梁肋均匀受火,桥面变形基本同步;所有梁肋受火,桥面平整度不受影响;中肋受火,桥面平整度随延火时间直线变化;余肋受火,桥面平整度大多呈曲线变化。The fire model and calculation method of FEM for pre-stressed concrete multi-beam T-shaped girder bridge exposed to fire were proposed,the time-dependent deformation was analyzed,and the roughness of deck was disclosed.The experimental results indicate that during the fire-extending process,the beam body exposed to fire has a transformation procedure from reverse arch to dawn warping,deck presents an against U type under condition of symmetric edge rib subjected to fire,deck presents V type under condition of symmetric middle rib subjected to fire;the roughness of deck is not affected by all ribs＇ fire,the roughness of deck presents a linear variation under condition of mid-ribs＇ fire,the roughness of deck presents a curve variation under condition of other ribs＇ fire.

关 键 词：桥梁工程 预应力混凝土 T型梁桥 火灾 平整度 

分 类 号：U44[建筑科学—桥梁与隧道工程]