Method for determining flexural capacity of prestressed light ultra-high performance concrete beam

Abstract

The invention belongs to the technical field of civil construction and transportation industry bridge engineering. The invention discloses a method for determining the flexural capacity of a prestressed light ultra-high performance concrete beam. The method is characterized by comprising the following steps: 1) determining basic parameters of the prestressed light ultra-high performance concrete beam; 2) determining the performance of the lightweight ultra-high performance concrete, and testing the mechanical properties of the reinforcing steel bar; (3) carrying out a bending test on the prestressed light ultra-high performance concrete beam to obtain a bending bearing capacity calculation formula of the prestressed light ultra-high performance concrete beam; and 4) substituting the corresponding data into a flexural capacity calculation formula of the prestressed light ultra-high performance concrete beam to determine the flexural capacity of the prestressed light ultra-high performance concrete beam. According to the method, the problem that an existing standard flexural capacity formula is not suitable for the prestressed light ultra-high performance concrete beam is solved, and theoretical and test basis is provided for application of LUHPC new materials in bridge engineering.

Description

technical field [0001] The invention belongs to the technical field of civil construction and bridge engineering in the transportation industry, and in particular relates to a method for determining the flexural bearing capacity of a prestressed lightweight ultra-high-performance concrete beam. Background technique [0002] The self-weight load of concrete bridge structures accounts for a large proportion of the entire design load, and the lightweight of concrete bridges is a research hotspot in bridge engineering. Our research group prepared a prestressed lightweight ultra-high performance concrete (or lightweight ultra-high performance concrete, Lightweight Ultra-High Performance Concrete, referred to as LUHPC), its basic mechanical properties are: compressive strength greater than 100MPa, split The crack strength is greater than 10MPa, and the elastic modulus is greater than 3.7×10 4 MPa, the apparent density is less than 2100kg / m 3 . However, as a new material, LUHPC'...

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Problems solved by technology

However, as a new material, LUHPC’s component flexural performance is not aimed at lightweight ultra-high performance concrete, and cannot be directly applied to the calculation of flexural performance of prestressed lightweight ultra-high performance concrete beams.

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