A cable-stayed bridge with steel-concrete steel shell combined girders with longitudinal ribs on top

Abstract

The invention discloses a longitudinal-rib-above-arranged steel-concrete-steel-shell-combining-beam cable-stayed bridge. The longitudinal-rib-above-arranged steel-concrete-steel-shell-combining-beam cable-stayed bridge comprises a main cable-stayed-bridge beam, the main cable-stayed-bridge beam is composed of a main span, side spans arranged on the two sides of the main span and transition sections arranged between the main span and the side spans; main towers are arranged on the two sides in the length direction of the main cable-stayed-bridge beam at intervals, wherein the main towers and the main cable-stayed-bridge beam are perpendicularly arranged; the tops of all the main towers are fixedly connected with the main cable-stayed-bridge beam through a plurality of stay cables, the main span is of a steel-concrete-combination whole steel box beam structure, and the side spans are of steel-concrete-combination-steel-shell-concrete-beam structures. According to the longitudinal-rib-above-arranged steel-concrete-steel-shell-combining-beam cable-stayed bridge, a longitudinal-rib-above-arranged steel-concrete-combination whole steel box beam is used for the main span, longitudinal-rib-above-arranged steel shell concrete beams are used in the side spans, bran-new steel concrete transition section modes are designed for the side spans, the large spanning capacity and the vertical rigidity are achieved, the construction speed is high, it is avoided that negative reaction force of the side spans appear, and the service life of the bridge face is prolonged.

Description

technical field [0001] The invention belongs to the technical field of cable-stayed bridges, in particular to a cable-stayed bridge with upper longitudinal ribs and steel-mixed steel shell combined girders. Background technique [0002] The advantages of conventional steel box girder cable-stayed bridges are light weight, large spanning capacity, steel box girders can be manufactured in factories, reliable quality, and fast construction speed; steel box composite girder cable-stayed bridges use less steel and the main bridge rigidity Large; hybrid girder cable-stayed bridges are economical and rigid. The above three cable-stayed bridges all have the following deficiencies in the application process: [0003] 1. Steel box girder cable-stayed bridge, the main girder has light weight, the main girder anchorage support effect is small, and the overall stiffness of the main bridge is relatively small; [0004] 2. There are many vertical and horizontal welds on the deck of the s...

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Problems solved by technology

[0004] 2. There are many vertical and horizontal welds on the deck of the steel box girder orthogonal special-shaped slab, the stress is complex, and fatigue cracks are prone to occur;

[0005] 3. For conventional steel box composite girder bridges, the concrete bridge deck needs to be equipped with a cast-in-place construction formwork system; if prefabricated construction is used, a concrete post-cast belt needs to be set up, and the construction speed is slightly slower

[0007] 5. The design and construction of the steel-concrete transition section of the hybrid girder cable-stayed bridge is complicated

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