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首页> 美国卫生研究院文献>Materials >Structural Safety Evaluation of Precast Prestressed Concrete Deck Slabs Cast Using 120-MPa High-Performance Concrete with a Reinforced Joint
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Structural Safety Evaluation of Precast Prestressed Concrete Deck Slabs Cast Using 120-MPa High-Performance Concrete with a Reinforced Joint

机译：用120 MPa高性能钢筋混凝土浇筑的预制预应力混凝土桥面板的结构安全性评估

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摘要

Prestressed concrete structures are used in various fields as they can reduce the cross-sectional area of members compared with reinforced concrete structures. In addition, the use of high-performance and strength concrete can help reduce weight and achieve excellent durability. Recently, structures have increasingly been constructed using high-performance and strength concrete, and therefore, structural verification is required. Thus, this study experimentally evaluated the structural performance of a long-span bridge deck slab joint, regarded as the weak point of structures. The specimens were designed with a 4 m span for application to cable-stayed bridges. To ensure the required load resistance and serviceability, the specimens comprised of 120 MPa high-performance fiber-reinforced concrete and were prestressed. The deck slabs satisfied all static and fatigue performance as well as serviceability requirements, although they were thinner than typical concrete bridge deck slabs. The study also verified whether the deck slabs were suitable to help implement precast segmental construction methods. Finally, the results confirmed that the structural performance of the developed prestressed concrete (PSC) deck slab was sufficient for the intended bridge application as it achieved a sufficiently large safety factor in the static and fatigue performance tests, relative to the design requirement.
机译：预应力混凝土结构可用于各个领域，因为与钢筋混凝土结构相比，它们可以减小构件的横截面积。另外，使用高性能和强度的混凝土可以帮助减轻重量并获得出色的耐久性。近年来，越来越多地使用高性能和强度混凝土来构造结构，因此，需要结构验证。因此，本研究通过实验评估了大跨度桥面板平板节点的结构性能，这被视为结构的薄弱点。标本的跨距设计为4 m，适用于斜拉桥。为了确保所需的抗负载性和可维修性，样品由120 MPa高性能纤维增强混凝土组成，并经过预应力处理。桥面板比典型的混凝土桥梁桥面板薄，但满足了所有静态和疲劳性能以及可维护性要求。该研究还证实了甲板平板是否适合帮助实施预制分段施工方法。最后，结果证实，所开发的预应力混凝土（PSC）甲板平板的结构性能足以满足预期的桥梁应用，因为相对于设计要求，它在静态和疲劳性能测试中获得了足够大的安全系数。

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