| 整跨火荷载下PC薄壁多室变宽箱梁桥的变形 |
| |
| 引用本文： | 张岗,贺拴海,王翠娟.整跨火荷载下PC薄壁多室变宽箱梁桥的变形[J].长安大学学报(自然科学版),2011(2):42-46. |
| |
| 作者姓名： | 张岗 贺拴海 王翠娟 |
| |
| 作者单位： | 长安大学交通行业旧桥检测与加固重点实验室; |
| |
| 基金项目： | 国家西部交通建设科技项目(2011318812970) |
| |
| 摘 要： | 针对火荷载作用下预应力混凝土薄壁多室箱梁桥的变形状况,基于温变模型和材料的热力参数,利用大型空间有限元程序ANSYS分析了三跨火荷载作用下预应力混凝土薄壁多室变宽箱梁桥的变形,研究了三跨受火、单跨加载和三跨受火、多跨加载模式,并分析了各模式三跨跨中最大挠度在单荷载比下随延火时间的变化规律。研究结果表明:整跨受火、单跨加载或多跨加载模式下,中跨跨中挠度在延火前期均下挠,延火后期有返挠和走平趋势;第一跨和第三跨的跨中挠度在整个延火期内随延火时间呈下挠趋势,均大于第二跨跨中挠度,延火前期第一跨跨中的挠度稍大于第三跨跨中的挠度,延火终期以第三跨的挠度值最为显著。三跨挠度值受箱梁的变宽结构形式、火荷载模式影响较大。
|
| 关 键 词： | 桥梁工程 薄壁箱梁 单荷载比 火荷载 变形 |
Deformation analysis of pre-stressed concrete multi-cell thin-wall variable width box girders bridge exposed to co-action of fire and load |
| |
| ZHANG Gang,HE Shuan-hai,WANG Cui-juan.Deformation analysis of pre-stressed concrete multi-cell thin-wall variable width box girders bridge exposed to co-action of fire and load[J].JOurnal of Chang’an University:Natural Science Edition,2011(2):42-46. |
| |
| Authors: | ZHANG Gang HE Shuan-hai WANG Cui-juan |
| |
| Institution: | ZHANG Gang,HE Shuan-hai,WANG Cui-juan (Key Laboratory for Old Bridge Detection and Reinforcement Technology of Ministry of Transportation,Chang'an University,Xi'an 710064,Shaanxi,China) |
| |
| Abstract: | Being aimed to deformation problem of pre-stressed concrete thin-walled multi-room box girders exposed to co-action of fire and load,on the basis of enthalpy conduction model and thermo-mechanics parameters,the finite element procedure was applied to analyze the deformation of three spans pre-stressed concrete thin-walled multi-room box girders exposed to co-action of fire and load,fire and load model of single span and multi span was studied,the maximum deflection of each span during prior periods and anap... |
| |
| Keywords: | bridge engineering thin-wall box girder single load ratio fire and load deformation |
| 本文献已被 CNKI 等数据库收录！ |
|
