Simple-support variant-continuous structure of steel-ultrahigh performance concrete light composite beam and construction method for same

Abstract

The invention discloses a simple-support variant-continuous structure of a steel-ultrahigh performance concrete light composite beam. The structure comprises two span simple-support beams which are disposed in opposite directions as well as a cast-in-place ultrahigh performance concrete connecting part which is used connect the two span simple-support beams, wherein each simple-support beam comprises a diaphragm beam, a bridge deck and a double I-shaped steel beam; the diaphragm beam is disposed in the double I-shaped steel beam; the bridge deck is disposed on the double I-shaped steel beam; the double I-shaped steel beam comprises a web, an I-shaped steel upper wing edge and an I-shaped steel lower wing edge; an end baffle is disposed on the double I-shaped steel beam; the end baffle is welded on the web and the I-shaped steel lower wing edge and welded to an end part of the I-shaped steel upper wing edge; the web and the I-shaped steel lower wing edge stretch out from the inner side of the end baffle; the diaphragm beam is placed on the stretched part; and the cast-in-place ultrahigh performance concrete connecting part wraps the web. The simple-support variant-continuous structure has the advantages that force bearing in a negative bending moment area is improved; and a continuous bridge has higher durability and a longer service life.

Description

technical field [0001] The invention relates to a bridge component and its construction, in particular to a simply supported variable continuous structure of a steel-ultra-high performance concrete light composite beam and a construction method thereof. Background technique [0002] Steel-UHPC (Ultra-High Performance Concrete, Ultra-High Performance Concrete) light composite beam has light weight, high strength, convenient transportation and construction, and can be erected quickly, so it has a wide range of application prospects. Compared with traditional steel-concrete composite beams, steel-UHPC lightweight composite beams have obvious economic and technical advantages. However, similar to ordinary steel-concrete composite beams, when the structure of steel-UHPC light composite beams changes from simply supported to continuous, the upper concrete bridge deck is under tension in the negative moment zone near the middle support point, and the lower steel girder is under com...

AI Technical Summary

Problems solved by technology

[0003] Since the steel-UHPC light-duty composite beam has the characteristics of factory overall prefabrication and cancellation of prestressing, the common method to solve the concrete cracking in the negative moment zone of steel-concrete composite continuous beam bridge is not suitable for use

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