Main girder structure and main girder of streamlined multi-box girder

Abstract

The invention discloses a main girder structure of a streamlined multi-box girder. The main girder structure comprises at least one middle box grinder, two side box grinders, a plurality of connectingbeams, the bottom of the cross section of each middle box grinder is provided with a first streamlined outward projection from two sides to the middle of the bottom, railways are laid on the middle box grinder, the side box grinders are symmetrically distributed on two sides of the middle box grinders, highways are laid on the side box grinders, the bottom of the cross section of each side box grinder close to one side of the corresponding middle box grinder is provided with a second streamlined outward projection, the cross section of each side box grinder far away from one side of the corresponding middle box grinder is in a shape of a sharp corner, the connecting beams are vertically distributed at intervals and used for horizontally connecting with adjacent side box grinders and middle box grinders or middle box grinders and middle box grinders, and each connecting beam comprises at least one unit connecting beam. The invention further discloses a main grinder of the streamlined multi-box girder. The main girder structure of the streamlined multi-box girder improves wind-resistant stability.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a main girder structure and main girder of a streamlined multi-box girder. Background technique [0002] For road-rail dual-purpose bridges that pass through both roads and railways, truss structures are usually used as the main beam in the past to improve the system stiffness of the structure. However, with the increase of the span of the bridge, the system stiffness of the structure decreases continuously, and the wind resistance stability gradually becomes a controlling factor of the long-span bridge. At present, the common wind resistance problems of long-span bridges are mainly manifested as flutter and eddy vibration. Flutter can cause divergent damage to the structure; although eddy vibration is not divergent, severe vibration can cause fatigue damage to the structure. [0003] In order to solve the problem of wind resistance stability of long-span bridges, br...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of wind resistance stability of long-span bridges, bridge engineers have carried out continuous exploration and research since the Tacoma bridge was destroyed by wind, and proposed some effective active control aerodynamic measures, such as adding deflectors, stabilizing plates, Measures such as slotting have also achieved some good results; however, when the wind speed at the bridge site is too high, a combination of several aerodynamic measures is often required

[0004] Most active control aerodynamic measures add structural measures to the original main girder structure. Although the structural form of the main girder has not been changed, the additional devices have changed the shape and functionality of the main girder. Bottom inspection vehicles and other structures require special handling, etc.

Images