Study on transverse post-tensioning in assembly slab bridges

被引：3
|
作者：
Pan Z. [1 ,2 ]
Fu C.C. [2 ]
Lü Z. [1 ]
机构：
[1] Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University
[2] Department of Civil Engineering, University of Maryland
来源：
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2010年 / 40卷 / 06期
关键词：
Assembly slab bridge; Contact element; Shear friction; Shear key; Transverse post-tensioning;
D O I：
10.3969/j.issn.1001-0505.2010.06.026
中图分类号：
学科分类号：
摘要：
An approach based on the concept of shear friction, which is used for designing the transverse post-tensioning in the slab bridges, is presented. Calculation shows that the transverse performance of the slab bridge is stronger as the transverse post-tensioning increases, considering the shear keys and overlays crack longitudinally. However, the transverse performance can't be improved if the transverse post-tensioning reaches a certain level (like Np0). Therefore, the required post-tensioning force should be greater than Np0. In addition, a newly rehabilitated bridge in the state of Maryland is load tested for evaluating the effect of transverse post-tensioning under truck load. The results of calculation and experiment indicate that the effect of higher transverse post-tensioning on the structural integrity prior to the cracking of shear key is not obvious due to the enough load transfer capability of uncracked shear keys and overlays. However, once shear keys and overlays crack, the transverse post-tensioning rods are engaged which prevents the structure from experiencing further deterioration, making the structure behave in monolithic manner.
引用
收藏
页码：1264 / 1270
页数：6
相关论文
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