Internal Force Adjustment Method of Concrete Slab of New Steel Concrete Composite Beam

Abstract

The invention discloses a novel internal force adjusting method of a steel-concrete composite beam concrete slab and relates to the technical field of steel-concrete composite beams. The novel internal force adjusting method of the steel-concrete composite beam concrete slab comprises the steps of constructing multiple mid-span concrete slabs on a steel main beam after the steel main beam, multiple pier top formal supporting points and multiple mid-span temporary supporting points are constructed in place; reserving clearances between the adjacent mid-span concrete slabs, wherein the clearances are positioned at the pier top formal supporting points and used for follow-up construction of pier top concrete slabs; lifting the pier top formal supporting points; constructing the pier top concrete slabs in the clearances between the two adjacent mid-span concrete slabs; and then dropping the pier top formal supporting points to the original elevation. According to the novel internal force adjusting method of the steel-concrete composite beam concrete slab, as pre-pressure is stored in the concrete slabs at the pier top, the construction mode is simple and the working efficiency is high.

Description

technical field [0001] The invention relates to the technical field of steel-concrete composite beams, in particular to a method for adjusting the internal force of a concrete slab of a novel steel-concrete composite beam. Background technique [0002] Steel-concrete composite beams are more and more widely used because of their low cost, effective avoidance of steel bridge deck fatigue and risk of pavement, economical and durable concrete bridge deck pavement, and convenient maintenance and repair. However, the concrete slab in the negative bending moment area of ​​the fulcrum at the top of the pier is subjected to tension and cracking due to the negative bending moment. In order to make the crack width meet the specification requirements, the usual method is to strengthen the reinforcement configuration in the concrete slab, or arrange prestress in the concrete slab. Tendons, and then by stretching the prestressed tendons to apply the precompressive stress in the concrete ...

AI Technical Summary

Problems solved by technology

With the increase of bridge width and span, the concrete slab in the negative moment area of ​​the fulcrum at the pier top of the steel-concrete composite beam will bear greater bending tensile stress. Effectively solve the problem of concrete tension cracking, and the tensioning process of prestressed tendons is complicated and the efficiency is low. Most of the prestress is transferred to the steel girder, and only a small part of the prestress is stored in the concrete slab after application. Therefore, it is necessary to study new Internal Force Adjustment Method of Steel Concrete Composite Beam

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