Ultra-high performance concrete and ordinary reinforcement concrete combined beam

Abstract

The invention relates to the technical field of structure design, and particularly relates to an ultra-high performance concrete and ordinary reinforcement concrete combined beam. The ultra-high performance concrete and ordinary reinforcement concrete combined beam comprises a UHPC prefabricated main beam and a post-cast ordinary reinforced concrete bridge panel; the ultra-high performance concrete and ordinary reinforcement concrete combined beam is characterized in that the UHPC main beam is prefabricated in early period, and the top part of the UHPC main beam is provided with a hear force connector in advance; the UHPC main beam is erected in place and then used as a construction platform; the top edge of the UHPC main beam is provided with a reinforcement mesh piece post-cast ordinaryconcrete; through combination of the shear force connector at the top of the UHPC prefabricated beam, the combined beam is formed. The combined beam is light in member, simple in transportation and hoisting, convenient to construct, good in economic efficiency, and able to fully display the material stress performance.

Description

technical field [0001] The invention relates to the technical field of structural design, in particular to a composite beam composed of ultra-high performance concrete and ordinary reinforced concrete, and in particular to a composite beam composed of a UHPC prefabricated beam and an ordinary reinforced concrete bridge deck. Background technique [0002] Ultra-High Performance Concrete (UHPC for short) is a new type of cement-based material that is different from ordinary high-performance concrete in terms of material composition, mix design, and microstructure. Ultra-high toughness and ultra-high durability. Applying it to the bridge structure will give the bridge structural components light weight, simple transportation and hoisting, convenient construction, good seismic performance, good durability, etc., and can further promote the lightweight prefabricated assembly design of the lower structure, adapting to the current development of urban bridge construction Direction...

AI Technical Summary

Problems solved by technology

When its full section is applied to the bridge structure mainly subject to bending, because the elastic modulus of the material is not high enough, and the compressive strength is much higher than the tensile strength, it is found in the structural design that when the UHPC in the tension area of ​​the lower edge of the main girder fully exerts its The compressive stress of UHPC in the compression zone is still much lower than its compressive strength when the tensile steel bar reaches yield, and the high compressive strength of UHPC in the compression zone has not been fully utilized

At the same time, because the price of UHPC materials is significantly higher than that of ordinary concrete, the economy of full-section UHPC main beams is not good

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