Web member structure of concrete-filled steel tube truss type main arch and bridge

Abstract

The invention discloses a web member structure of a concrete-filled steel tube truss type main arch and a bridge. The web member structure comprises a plurality of sets of web member assemblies. Eachweb member assembly comprises a transverse web member and two inclined web members, the transverse web member and the two inclined web members form a triangular unit, the two ends of the transverse web member are used for being connected with the upper chord and the lower chord of the main arch on the same side respectively, one end of one inclined web member is used for being connected with the upper chord, and the other side of the inclined web member is connected with the middle of the transverse web member in the adjacent web member assembly; one end of the other inclined web member is used for being connected with the lower chord, and the other side of the inclined web member is connected with the middle of the transverse web member in the adjacent web member assembly. The free lengths of the inclined web members and the transverse web members are smaller than or equal to the height of the section of the main arch, the free lengths and slenderness ratios of the web members are reduced, if cutting is conducted in the direction of the cross section of the main arch, at least two intersection points exist between the tangential direction and the web member assemblies, compressiverigidity and shear rigidity of the web members are improved, and local instability of the main arch web members is effectively avoided.

Description

technical field [0001] The invention relates to the field of bridges, in particular to a web bar structure of a steel tube concrete truss type main arch and a bridge. Background technique [0002] As an excellent steel-concrete composite structure bridge, concrete-filled steel tube arch bridges have been rapidly developed in recent years. The arrangement of main soffits of concrete-filled steel tube truss arch bridges mainly adopts an "N-shaped" arrangement, and the angle between the oblique webs and the axis of the main arch Generally, it is 30°~60°. The free length of the web members in this arrangement is greater than or equal to the height of the main arch section, and the free length of the web members is generally 1.15-2 times the height of the main arch section. [0003] As the span of concrete-filled steel tube arch bridges continues to increase, the section height of the main arch increases, and the length of the webs connecting the upper and lower chords of the mai...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems in the prior art that as the span of the concrete-filled steel tube arch bridge increases, the section height of the main arch increases, and the length of the web connecting the upper and lower chords of the main arch increases accordingly, thereby affecting the local stability of the compression web To solve the problem of safety, provide a web bar structure and bridge structure of concrete filled steel tube truss

Images