Novel steel braced girder composite structure

Abstract

The invention relates to a novel steel truss beam composite structure. A steel-concrete combined bridge surface subsection is arranged at the side span or at the middle span of a main truss according to the requirements, and an all-steel beam structure subsection can be arranged at the middle span or at the side span of the main truss according to the requirements. In the invention, the all-steel truss beam subsection is adopted at the section with the deadweight required to be reduced, and the steel-concrete combined bridge surface subsection is adopted when the deadweight is required to be increased or the rigidness of the bridge beam is required to be increased. The characteristics of strong integrity and great rigidity of the steel truss beam-concrete combination are fully utilized in the invention, and problems of rigidity of the all-steel truss beam and negative reaction of the side span are solved. Therefore, the invention has the advantages that the stress rationality of double-purpose continual steel truss beams of wide-span highways and railways can be guaranteed, the material performance of steel and concrete is fully utilized, the cross section of each rod is reduced, and the requirements for the steel beams and thick sheets are reduced, so the steel material can be purchased easily. So the reduction of the whole project cost is realized.

Description

technical field [0001] The invention relates to a long-span road-rail dual-purpose bridge. Background technique [0002] In recent decades, with the rapid development of my country's social economy, the traffic volume of trains and automobiles with the demand of crossing rivers and seas has increased rapidly, while the resource of bridge space is limited. At the same time, due to the navigation requirements of rivers, the span of bridges is also increasing. Larger, the requirements for the performance of bridges are getting higher and higher. Steel truss bridges for highway and railway have the advantages of large span, light weight, and high bearing capacity, and are often the first choice for bridges across rivers and seas. The following problems are often encountered in the design of this bridge type: 1. Due to the large span of the bridge, or under various external conditions, the span layout is not reasonable, the support is prone to negative reaction force, or the live...

AI Technical Summary

Problems solved by technology

The following problems are often encountered in the design of this bridge type: 1. Due to the large span of the bridge, or under various external conditions, the span layout is not reasonable, the support is prone to negative reaction force, or the live load is large , if the whole bridge adopts steel truss girders, it may cause unreasonable structural force and use in some cases; Difficult to design

Images