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Steel fibre reinforced self-compacting concrete for lightweight and durable pedestrian bridges : creep behaviour

机译:钢纤维增强自密实混凝土,用于轻便耐用的人行天桥:蠕变行为

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摘要

In recent years, pedestrian bridges built from composites materials have notably increased. This growth is related to the durability problems of traditional materials, as well as the need for fastest construction times. In this context, fiber reinforced concrete (FRC) becomes an important material in this type of structures, since the ductility, high post-cracking tensile strength, high compressive stiffness and strength of FRC can be combined with the benefits derived from the use of FRP profiles to obtain high performance structural systems. In addition, FRC exhibits a durable behaviour since, in general, does not have corrosion problems. In this paper a 12 m length single span pedestrian bridge composed by a Steel Fiber Reinforced Self-Compacting Concrete (SFRSCC) deck and two Glass Fiber Reinforced Polymer (GFRP) pultruded I shape profiles was designed. The SFRSCC deck has a constant thickness of 40 mm and 2000 mm wide and a content of hooked ends steel fibers in its mixture, which ensures the necessary strength and ductility for the acting loads. The high post-cracking tensile strength of the SFRSCC allowed the use of pre-stressed solutions in the bridge structural system, which caused an upward deflection and, consequently, tensile stresses in the SFRSCC deck. Two prototypes of this structural system were built and monitored in order to assess their long-term deformational behavior when subjected to a loading configuration correspondent to the load combination for the deflection serviceability limit states. The main results are presented and discussed.
机译:近年来,由复合材料建造的人行天桥显着增加。这种增长与传统材料的耐用性问题以及最快的施工时间有关。在这种情况下,纤维增强混凝土(FRC)成为此类结构中的重要材料,因为FRC的延展性,高的开裂后抗张强度,高的压缩刚度和强度可以与使用FRP带来的好处结合起来型材以获得高性能的结构系统。另外,由于通常不存在腐蚀问题,因此FRC表现出耐久的性能。本文设计了一个12 m长的单跨人行天桥,由钢纤维增强自密实混凝土(SFRSCC)甲板和两个玻璃纤维增​​强聚合物(GFRP)拉制而成的I形轮廓组成。 SFRSCC甲板的恒定厚度为40毫米,宽度为2000毫米,并在其混合物中包含钩状末端钢纤维,从而确保了作用载荷所需的强度和延展性。 SFRSCC开裂后的高抗拉强度允许在桥梁结构系统中使用预应力解决方案,这会导致向上挠曲,从而导致SFRSCC桥面的拉应力。构造并监视了该结构系统的两个原型,以便评估它们在承受与挠性可使用极限状态的载荷组合相对应的载荷配置时的长期变形行为。主要结果介绍和讨论。

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