Large cantilever steel box girder

Abstract

The invention discloses a large cantilever steel box girder, which comprises a top plate, a bottom plate, an inner side web plate, an outer side web plate, a main box chamber diaphragm plate, an inclined bottom plate, a cantilever web plate, a cantilever box chamber diaphragm plate, a top plate longitudinal stiffening rib, a bottom plate longitudinal stiffening rib, an inner side web plate longitudinal stiffening rib, an outer side web plate first longitudinal stiffening rib and an outer side web plate second longitudinal stiffening rib, wherein one outer side web plate second longitudinal stiffening rib is arranged on the inner side surface of the outer side web plate, and is arranged corresponding to the inner side edge of the inclined bottom plate; the cantilever box chamber diaphragm plate comprises a diaphragm plate web, a diaphragm plate flange plate, an inclined strut and a gusset plate. The main box chamber is a main longitudinal stress component, the diaphragm plate of the cantilever box chamber adopts a structure combining a solid-web diaphragm plate and an open-web truss, and the requirements for beam width and transverse stress are met. The structure is clear in stressform, enough transverse rigidity is provided, the structure is light, cantilevers of the whole bridge are unified, factory construction is facilitated, and the structure is suitable for equal-height steel box girder bridges and variable-height and variable-width steel box girder bridges.

Description

technical field [0001] The invention belongs to the technical field of bridges, and in particular relates to a steel box girder with a large cantilever arm. Background technique [0002] With the development of social economy, the traffic volume is increasing, and the width of bridges is also increasing. In recent years, continuous beams with long-span steel boxes (composite steel boxes) with a bridge width of more than 60 meters have appeared. [0003] In these long-span steel box (composite steel box) continuous girders, the girder height is generally high, and the girder height varies along the longitudinal direction of the bridge. Too big and bulky in appearance. For this kind of steel box girder or composite steel box girder bridge with large bridge width, equal height or variable height, its transverse design is a complicated and necessary task. [0004] Among them, the design of the diaphragm is extremely important. Existing diaphragms generally adopt solid-belly d...

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Problems solved by technology

For this kind of steel box girder or composite steel box girder bridge with large bridge width, equal height or variable height, if the diaphragm adopts solid-web diaphragm, in order to ensure that the diaphragm does not lose stability, it is necessary to set up sufficient Vertical stiffeners and transverse stiffeners, such setting will increase the weight of the structure and cause waste of resources; if the diaphragm adopts the hollow diaphragm, the diagonal bracing generally adopts channel steel and circular cross-section, but the out-of-plane of the channel steel cross-section The rigidity is very small, and the welding of the circular section and the gusset plate is prone to fatigue damage, and it is difficult to cope with the complex stress state on the diagonal brace

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