Numerical study of stress states near construction joint in two-plate-girder bridge with cast-in-place PC slab
Numerical study of stress states near construction joint in two-plate-girder bridge with cast-in-place PC slab
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DOI：
10.12989/sem.2005.19.2.173
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发表时间：
2005-01-30
影响因子：
2.2
通讯作者：
Kubo, Y
中科院分区：
文献类型：
--
作者：
Yamaguchi, E;Fukushi, F;Kubo, Y
为了降低造价，双板梁桥在日本越来越受欢迎。这种类型的桥梁采用PC板，通常现浇。在这种情况下，混凝土通常不会一次浇注到整个板上：某些部分比其余部分先建造。因此，不可避免地会产生施工缝。由于混凝土的干缩，混凝土板会产生拉应力。不同龄期混凝土在施工缝附近会产生较高的拉应力。此外，预应力不是一次施加在板的整个长度上。这也可以用作板中的拉伸应力的来源。因此，现浇混凝土板，特别是施工缝附近，有可能受到拉伸开裂。本文对某双板梁桥现浇混凝土板施工缝附近的应力状态进行了数值研究。采用有限元法，对混凝土干缩和预应力的影响进行了三维分析。由此得到的PC板的应力状态进行了讨论。本文还提出了板梁的简化模型。
For reducing construction cost, two-plate-girder bridges are getting popular in Japan. This type of bridge employs a PC slab, which is often cast-in-place. In such a case, concrete is not usually cast over the whole slab at one time: some portions are constructed earlier than the rest. Therefore, a construction joint is inevitably created. Due to the drying shrinkage of concrete, tension stress may occur in concrete slab. High tensile stress can be expected near the construction joint where concretes with different ages meet. Moreover, prestressing is not applied over the whole length of slab at one time. This may also serve as a source of tensile stress in the slab. Thus there is a chance that cast-in-place PC slab, especially near the construction joint, may be subjected to tensile cracking. In the present study, stress states near the construction joint in the cast-in-place PC slab of a two-plate-girder bridge are investigated numerically. The finite element method is employed and the three-dimensional analysis is conducted to see the influence of dry shrinkage and prestressing. The stress states in the PC slab thus obtained are discussed. The simplified model of a plate girder for this class of analysis is also proposed.