密集横隔板UHPC箱梁桥面板双向受力性能试验

发布时间：2018-04-26 06:16

本文选题：桥梁工程 + UHPC箱梁桥面板　；参考：《中国公路学报》2016年08期

【摘要】：针对一种超大跨径单向预应力超高性能混凝土(UHPC)连续箱梁桥,为探讨其具有密集横隔板构造的桥面板在局部轮载作用下的双向受力性能,开展了1∶5缩尺模型试验和有限元数值模拟,并以此为基础,对桥面板的轮载双向分配与控制截面内力计算问题进行了初步推导与计算。结果表明:5.5倍设计车轮局部荷载作用下,试验工况桥面板仍处于线弹性受力阶段;具有密集横隔板构造的UHPC箱梁桥面板属双向受力构件,纵桥向成为主受力方向;线弹性受力阶段,最不利正弯矩工况下桥面板轮载纵横桥向分配比在疏隔板侧约为1∶0.64,在密隔板侧约为1∶0.53,轮载分配趋于均匀,桥面板受力效率提高;桥面板负弯矩以横隔板支承处纵桥向弯矩为控制值,现行规范的内力算法应用于该桥面板尚存在一定偏差。
[Abstract]:In order to study the bidirectional mechanical behavior of the bridge deck slab with dense transverse partition structure under local wheel load, a kind of UHPC continuous box girder bridge with super-large span unidirectional prestressed ultra-high performance concrete (UHPC) is studied. The 1:5 scale model test and finite element numerical simulation are carried out, and based on this, the internal force calculation of the two-way load distribution and the control section of the bridge deck is preliminarily deduced and calculated. The results show that under the action of local load of 5: 5.5 times design wheel, the bridge deck is still in the stage of linear elastic force under the test condition, and the UHPC box girder bridge with dense transverse diaphragm is a bidirectional bearing member, and the longitudinal bridge becomes the main force direction. At the stage of linear elastic force, the distribution ratio of longitudinal and transverse bridge load of deck plate is about 1: 0.64 on the side of the sparse partition board and 1: 0.53 on the side of the dense partition board under the most unfavorable positive moment condition. The load distribution of the bridge deck tends to be uniform, and the efficiency of the bridge deck plate is improved. The negative moment of the bridge deck is controlled by the longitudinal moment of the bridge supported by the transverse partition plate. However, there is still a certain deviation in the application of the internal force algorithm of the current code to the bridge panel.
【作者单位】：湖南大学风工程与桥梁工程湖南省重点实验室;上海市政工程设计研究总院(集团)有限公司;
【基金】：国家自然科学基金项目(51378194) 广东省交通运输厅科技项目(2013-02-036)
【分类号】：U446

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