Layered suspension structure of single-side double-main-cable steel truss stiffening girder suspension bridge

Abstract

The invention discloses a layered suspension structure of a single-side double-main-cable steel truss stiffening girder suspension bridge. A main cable close to the inner side of a bridge deck is connected to an upper chord of a steel truss stiffening girder through a cable clamp and a sling, and a main cable close to the outer side of the bridge deck is connected to a bracket extending out of a lower chord of the steel truss stiffening girder through a cable clamp and a sling. The single-side double main cables are arranged at different heights with one cable arranged at the upper part, and the other main cable arranged at the lower part, or the inner side main cable and the outer side main cable are arranged in parallel at the same height, or the inner side main cable and the outer sidemain cable are arranged in a double-chain manner. The bridge deck width occupied by the main cable suspension area can be reduced, so that the dead load of the stiffening girder is reduced, and the transverse width of the bridge tower is also reduced. The problem that the lifting point force is excessively concentrated on the upper (or lower) layer node can be effectively reduced by layered suspension. The inner and outer slings are different in length, so that same-frequency resonance of the slings can be avoided. The heights of the inner and outer main cables are different, so that cable vibration caused by wake flow can be avoided. If the double main cables are arranged in a double-chain form, the S-shaped deflection of the stiffening girder can be reduced.

Description

technical field [0001] The invention relates to the technical field of suspension bridge structures, in particular to a layered suspension structure of a steel truss stiffened beam suspension bridge with double main cables on one side. Background technique [0002] The suspension bridge has beautiful shape and strong spanning ability, and is one of the preferred structural forms of long-span bridges. At present, there are 26 suspension bridges with a span of more than 1000m that have been built or are being built in China (including highway and railway bridges). Among them, the span of Wuhan Yangsigang Bridge reaches 1700m, which is the largest suspension bridge in China. The suspension bridge with the largest span in the world is the Akashi Kaikyo Bridge in Japan, with a span of 1991m. With the increasingly mature technology of design and construction of long-span suspension bridges, coupled with the urgent engineering demand for super-long-span bridge structures of cross-...

AI Technical Summary

Problems solved by technology

However, the suspension structure system has the following two problems: ①Since the double main cables are connected to the upper bridge deck of the stiffened beam, the suspension area of ​​the main cable occupies the width of the bridge deck, thus increasing the dead load of the stiffened beam 1. The force of the sling is large and the force of the lifting point is too concentrated; ②Since the length of the slings of the double main cables is the same, it is easy to cause the resonance of the same frequency of the slings or the cable vibration caused by the wake

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