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首页> 美国政府科技报告 >Mechanical Propertires of High Strength Concrete for Prestressed Concrete Bridge Girders;Research rept. Jan 00-May 03
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Mechanical Propertires of High Strength Concrete for Prestressed Concrete Bridge Girders;Research rept. Jan 00-May 03

机译：预应力混凝土桥梁高强混凝土力学性能研究。 1月00日至5月3日

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This is the second of four reports that document the findings of a Texas Department of Transportation sponsored research project to evaluate the allowable stresses and resistance factors for high-strength concrete (HSC) prestressed bridge girders. HSC is widely used in prestressed concrete bridges. However, current design provisions for prestressed concrete bridge structures, such as the American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Specifications, were developed based on mechanical properties of normal strength concrete (NSC). As a first step toward evaluating the applicability of current AASHTO design provisions for HSC prestressed bridge members, statistical parameters for the mechanical properties of plant-produced HSC were determined. In addition, prediction equations relating mechanical properties with the compressive strength were evaluated. HSC samples were collected in the field from precasters in Texas and tested in the laboratory at different ages for compressive strength, modules of rupture, splitting tensile strength, and modulus of elasticity. Statistical analyses were conducted to determine the probability distribution, bias factors (actual mean-to-specified design ratios), and coefficients of variation for each mechanical property. Creep and shrinkage were also monitored and evaluated.

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