UHPC + NC composite bridge deck in hogging moment area of steel-concrete composite beam

Abstract

A steel-concrete composite beam hogging moment area UHPC + NC composite bridge deck comprises a UHPC ultra-high performance concrete layer and an NC common concrete layer, the NC common concrete layer is laid on a steel beam, and the UHPC ultra-high performance concrete layer is laid on the NC common concrete layer. The NC common concrete layer and the UHPC layer are both fixedly connected with the steel beam, the thickness of the UHPC layer and the thickness of the NC common concrete layer are the largest than tau at the middle supporting point, and tau is gradually reduced in the longitudinal direction of the bridge at the middle supporting point. According to the hogging moment area UHPC layer and NC common concrete layer laminated bridge deck based on the steel-concrete composite beam stress behavior and the steel-concrete interface behavior, the requirement for the bearing capacity and durability of the hogging moment area is met, meanwhile, the using amount of UHPC materials is reduced, and therefore the purpose of being more economical is achieved.

Description

technical field [0001] The invention belongs to the engineering and construction industry, and in particular relates to a UHPC+NC composite bridge deck in the negative moment zone of a steel-concrete composite beam. Background technique [0002] Steel-concrete composite girder bridges are more and more widely used in bridge structures because of their light weight, small cross-sectional height, and strong bearing capacity. Due to the low tensile strength of NC ordinary concrete, the concrete bridge deck in the continuous steel-concrete negative bending moment region is prone to cracking, resulting in reduced bridge bearing capacity and durability. UHPC ultra-high-performance concrete has ultra-high tensile and compressive capabilities and better durability, and can be used in negative moment areas to improve the strength and durability of composite beam structures. However, due to the high cost of UHPC at this stage, it is not economical to directly replace ordinary concret...

AI Technical Summary

Problems solved by technology

However, the above schemes are mainly aimed at the strength and durability of the steel-concrete composite beam negative moment area, and do not provide a solution for reducing the cost of UHPC use.

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