Longitudinal bridge direction joint connecting structure of profile steel UHPC composite board

Abstract

The invention discloses a longitudinal bridge direction joint connecting structure of a profile steel UHPC composite plate, a steel beam is arranged below the profile steel UHPC composite plate, a longitudinal stiffening plate is arranged at the transverse end part of the profile steel UHPC composite plate, a bearing platform plate is arranged on a side web plate of the steel beam, the longitudinal bridge direction joint connecting structure comprises cast-in-place connecting parts and reinforcing connecting pieces, wherein the cast-in-place connecting parts are arranged among the profile steel UHPC composite plates, the side webs and the bearing platform plates, and the reinforcing connecting pieces extend into the cast-in-place connecting parts. The reinforcing connecting pieces comprisetransverse shearing force connecting pieces arranged on the longitudinal stiffening plates and the side webs and vertical shearing force connecting pieces arranged on the bearing platform plate. Theinvention further provides a longitudinal-bridge-direction joint connecting structure located between the adjacent profile steel UHPC composite boards. The longitudinal-bridge-direction joint connecting structure has the advantages of being light in dead weight, high in tensile capacity and the like, and a bridge deck of a profile steel UHPC composite board adopting the longitudinal-bridge-direction joint connecting structure is expected to completely replace a traditional orthotropic steel bridge deck in the future.

Description

technical field [0001] The invention belongs to the field of bridges, in particular to a seam connection structure. 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 are recognized as a worldwide problem in the field of steel bridges. my country has a large...

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 the longitudinal joints are set in more than 2 in the transverse direction of the bridge, and generally along the longitudinal direction of the bridge Layout, in order to ensure the safety of the joints, the width of the longitudinal joints needs to be wider, which is generally taken as 300mm in the above-mentioned patents, so the pouring volume is relatively large, resulting in an increase in the average plate thickness, which is not good for large-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 longitudinal wet joint. For the horizontal large cantilever structure, the bridge deck is in a state of axial tension in the transverse direction, and there is tensile stress on the bottom surface of the longitudinal joint, which may cause cracks risk; in addition, in the above two patents, the longitudinal seam of the bridge deck at the lower steel girder side web (inner side web or outer side web) also has the defects of too wide width and insufficient tensile capacity

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