Profile steel, profile steel-UHPC composite plate, bridge deck slab and steel-UHPC composite beam bridge

Abstract

The invention discloses profile steel which comprises an upper flange plate and a web plate, and the end of the upper flange plate and/or the end of the web plate extend/extends outwards to form an extending section. The invention further discloses profile steel which comprises an upper flange plate, a web plate and a lower flange plate, and the end of at least one of the upper flange plate, the web plate and the lower flange plate extends outwards to be provided with an extending section. The invention further provides a profile steel-UHPC composite plate which comprises a UHPC plate and a plurality of profile steel, wherein the UHPC plate is arranged on the upper flange plate of the profile steel. The invention further provides a bridge deck slab and a steel-UHPC composite beam bridge. The structure of the end of the profile steel is optimized, and the end of the profile steel is provided with the outer extending section, so that when the profile steel-UHPC composite plate obtained through the profile steel is connected through a wet joint, joint force transmission is more reliable, the tensile capacity is high, rigidity is high, various stress working conditions such as pulling,pressing, bending, shearing and twisting can be borne, and the joint can meet the full-section pulling condition.

Description

technical field [0001] The invention belongs to the field of bridges, and in particular relates to a steel structure for forming a bridge deck, a composite board, a bridge deck and a composite girder bridge. Background technique [0002] Long-span bridges are a symbol of the country's technological level. Steel structure bridges have the advantages of light weight, large spanning capacity, and good seismic performance, and are the first choice for long-span bridges. The deck structure of steel bridges usually adopts orthotropic steel deck system, but because the steel deck is a fully welded structure, not only the cost is high, but also the steel deck system suffers from two major diseases under the action of heavy-duty vehicles: ( 1) Fatigue cracking and local buckling of the steel bridge deck endanger the safety of the bridge; (2) frequent damage to the asphalt pavement and huge renovation costs. The above-mentioned diseases reduce the operating efficiency of bridges and...

AI Technical Summary

Problems solved by technology

However, practice has shown that UHPC low-rib bridge decks are 30% heavier than traditional steel decks, and are still difficult to apply to long-span bridges

In patents CN109338866A and CN109610310A, Professor Shao Xudong proposed a new type of steel-UHPC low-rib plate, but the bridge deck is used in long-span bridges, and there are many transverse wet joints, and a transverse diaphragm needs to be installed. In order to ensure the safety of the joints, the height of the transverse joints is set higher (the sum of the height of the UHPC top plate and the lower section steel), and the width is larger. In the above-mentioned patents, it is generally taken as 300mm, so the pouring volume is relatively large. It leads to an increase in the average plate thickness, which is unfavorable for long-span flexible bridges that are extremely sensitive to their own weight

At the same time, in these two patents, there is insufficient tensile capacity of the bottom surface of the joint in the transverse wet joint. For the mid-span area of ​​the cable-stayed bridge or the negative moment area of ​​the continuous girder bridge, since the bridge deck is in a state of axial tension in the longitudinal direction, Tensile stress at the bottom of the transverse seam, with possible risk of cracking

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