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FLEXURAL BEHAVIOR OF PRESTRESSED FIBER REINFORCED CONCRETE BRIDGE BEAMS

机译:预应力纤维钢筋混凝土桥梁弯曲行为

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摘要

Design, technology and construction of a small road bridge made of Very High Performance Concrete (VHPC) are described in this paper. The bridge consists of precast, prestressed concrete beams with a cast-in-place concrete deck. A preliminary experimental investigation was conducted to define the mix design, to characterize the material, its durability and to study the flexural behavior of the prestressed concrete beams with and without the concrete deck. In particular, a comprehensive program of concrete material properties tests was performed to evaluate tensile and compressive strengths, modulus of rupture, Young's modulus and physical properties (air permeability, porosity). Afterwards, a structural characterization of material was performed to design the final section of bridge beams and to define a model to justify the design rules adopted.
机译:本文描述了由非常高性能混凝土(VHPC)制成的小型道路桥的设计,技术和施工。该桥由预制的预应力混凝土梁组成,带有就地混凝土甲板。进行了初步实验研究以定义混合设计,以表征材料,其耐用性和研究预应力混凝土梁的弯曲行为,而无需混凝土甲板。特别是,进行了综合的混凝土材料性能测试,以评估拉伸和抗压强度,破裂模量,杨氏模量和物理性质(透气性,孔隙率)。之后,进行材料的结构表征以设计桥梁光束的最终部分,并定义模型,以证明所采用的设计规则。

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