Orthotropic steel-UHPC combined bridge deck with long and narrow notches and construction method of orthotropic steel-UHPC combined bridge deck

Abstract

The orthotropic steel-UHPC combined bridge deck comprises a panel, a transverse partition plate is fixed to the middle of the bottom of the panel in the length direction, and a plurality of U-shaped longitudinal ribs perpendicular to the transverse partition plate are further fixed to the bottom of the panel; an arc-shaped part is formed at the bottom of the U-shaped longitudinal rib, and straight plate parts which are tangential to the arc-shaped part are arranged on the two sides of the arc-shaped part; u-shaped longitudinal rib notches matched with the U-shaped longitudinal ribs are formed in the transverse partition plates. The transverse partition plates are welded and fixed with the U-shaped longitudinal ribs; an arc-shaped diaphragm plate long and narrow notch which is concentric with the arc-shaped part is formed below the through hole; a partition plate part is formed between the U-shaped longitudinal rib and the long and narrow notch of the transverse partition plate. The long and narrow notches are formed in the diaphragm plate base material, continuous stress flow of the longitudinal rib-diaphragm plate connector under the wheel load effect can be guaranteed, meanwhile, constraint of the diaphragm plate on the longitudinal rib is released, secondary stress of structural details can be reduced, and the fatigue performance is further improved.

Description

Technical field: [0001] The invention relates to the field of engineering, in particular to an orthotropic steel-UHPC composite bridge deck with slits and a construction method thereof. Background technique: [0002] Orthotropic decks began to be used in German bridge construction in the middle of the last century. Over the years, this kind of deck structure has become the preferred type of steel structure bridges, especially long-span bridges. After decades of engineering practice, the longitudinal rib-diaphragm connection of orthotropic bridge decks usually adopts the method of continuous passage of longitudinal ribs, and additional arc-shaped cuts are set on the diaphragm such as Figure 10 shown. However, under the action of wheel load, the longitudinal rib-diaphragm joint is in a complex three-dimensional stress state, and the processing of the longitudinal rib-diaphragm joint is very difficult, costly and difficult to control. In order to improve such problems, Xiang ...

AI Technical Summary

Problems solved by technology

Therefore, simply using composite decks still cannot completely solve the problem of fatigue cracking of orthotropic deck structural details.

Under the action of wheel load, there is stress concentration in the longitudinal rib-diaphragm joint, and the stress level is high, which is prone to fatigue cracking

[0004] Peng Bo, Shao Xudong, etc. published research on the fatigue performance of closed-rib lightweight composite bridge decks, and found that simply increasing the thickness of the diaphragm or longitudinal rib can reduce the stress level of a certain detail, but it will increase the stress of other structural details level, it is not economical, and at the same time increases the self-weight of the entire bridge deck structure

In addition, Gu Ping, Pei Huiteng, Sheng Bo, et al. published research on the fatigue performance of steel bridge decks with inner diaphragms in U-ribs. Although small diaphragms or ribs are arranged inside the longitudinal ribs, the stress of the longitudinal rib-diaphragm joints can be improved. But it will also introduce new fatigue structure details, which is not convenient for manufacturing and processing, increases the engineering cost, and is not conducive to the rapid production of industrial automation

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