Variable cross-section beam and suspension cable combined bridge structural system

Abstract

The invention discloses a variable cross-section beam and suspension cable combined bridge structural system. The variable cross-section beam and suspension cable combined bridge structural system is characterized in that variable cross-section main beams are arranged on piers at two ends, a uniform cross-section main beam is arranged between the variable cross-section main beams at the two ends and positioned in the middle of the main span, a low-altitude bridge tower is arranged at the pier top of each variable cross-section main beam, a saddle is arranged at the top of each low-altitude bridge tower, a suspension main cable is erected by use of the saddles and anchoring structures at two ends, suspenders are arranged at the middle segment of the suspension main cable, the uniform cross-section main beam is lifted up by the suspenders, and the saddles, the suspension main cable and the suspenders constitute a suspension cable system to realize large-span main span. The variable cross-section beam and suspension cable combined bridge structural system is reasonable in stress, economical, low in construction difficulty and attractive in appearance and can be applied to various river crossing or overpass bridges with the main span of 150-500 m.

Description

technical field [0001] The invention relates to the design of a bridge structure system with a main span of 150-500m. Background technique [0002] Variable cross-section continuous beams or continuous rigid frame bridges are the winners in the comparison of bridge type schemes within a span of 50-120m, but when the span of the main span is further increased, problems such as mid-span deflection and web cracking are prone to occur. And the shape of the bridge is simple, and the effect of the bridge landscape is general. [0003] Suspension bridges have large spanning capacity, and bridges with a span of more than 1000m are basically suspension bridges, and the bridges are beautiful in appearance. High-strength steel wires and large-size saddles are costly to cast; pilot cables are difficult to cross the river; temporary facilities such as catwalks need to be arranged for the installation of main cables and suspenders, and the construction measures are expensive and difficul...

AI Technical Summary

Problems solved by technology

[0003] Suspension bridges have large spanning capacity, and bridges with a span of more than 1000m are basically suspension bridges, and the bridges are beautiful in appearance. High-strength steel wires and large-size saddles are expensive to cast; pilot cables are difficult to cross the river; temporary facilities such as catwalks need to be arranged for the installation of main cables and suspenders, and the construction measures are expensive and difficult to control

Although the suspension structure is beautiful in shape, due to factors such as cost and construction difficulty, suspension bridge structure bridges have not been widely used in medium-span bridges.

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