整体式箱梁张拉过程的仿真分析  

Simulative analysis of stretching process of monolithic box beam

作　　者：赵曼[1] 王新敏[2] 阎贵平[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]石家庄铁道学院大型结构健康监测与诊断研究所,河北石家庄050043

出　　处：《西安建筑科技大学学报（自然科学版）》2006年第4期564-568,共5页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：铁道部科技攻关项目(200G48-C)

摘　　要：秦沈客运专线采用了许多整体式箱梁,主要介绍了其制造工艺和受力性能,并利用有限元软件模拟了其张拉过程,分析了混凝土梁体的应力和位移变化,以及力筋的应力变化情况.得到以下结论:张拉过程中,梁体最初上拱度很小,但是当重力发生作用后,梁体位移逐渐增大;力筋的应力在中间分布均匀,混凝土弹性压缩造成的应力损失由两端向中间逐渐增大,一定长度后维持不变;张拉完毕后,梁体顶底板位移的横向分布不同,必须考虑宽箱梁的剪切变形和剪力滞效应.因此建议在设计施工中,应通过仿真模拟分析结构的力学性能,提高结构的可靠度.Many monolithic box beams have been applied for Qin-shen passenger line. The manufacture process and mechanical property of these beams are mainly introduced in the paper. Finite element software is used to simulate its stretching process. The displacement and stress of the concrete are analyzed and so does the stress of prestressing tendons. The study shows that the displacement is small at the beginning and becomes bigger after self weight takes effects. The stress of prestressing tendons is uniform in the intermediate part, and prestressing loss due to elastic compression of concrete becomes larger from end to center and then remains the same after a certain length. The displacement at top and bottom plate is different along transverse, and therefore shearing deformation and shear slag effect must be considered. It is proposed that simulation should be done to improve reliability during design and construction.

关 键 词：整体式箱梁 张拉过程 仿真分析 应力 位移 

分 类 号：U448.2[建筑科学—桥梁与隧道工程]