Double-steel tube-concrete combined structural pylon

Abstract

A double-steel-tube concrete combined structure bridge tower pertains to a novel bridge tower structure applied in suspension bridge and cable-stayed bridge tower. In the double-steel-tube concrete combined structure bridge tower, each tower column consists of internal and external layers of steel tubes and concrete poured between the layers; the cross sections of the internal and external layers of steel tubes can be square, rectangular or polygonal, and the steel tubes are integrated with the concrete for joint stress, which can resist pressure and bending; the concrete is poured between the two layers of steel tubes to constrain the tube walls of the internal layer and the external layer of steel tubes, thus preventing the wall of the steel tube from bending; in order to ensure the mutual constraint between the steel tube and the concrete, one side of the walls of the internal layer and external layer of steel tubes close to the concrete is provided with a connector for shearing and pulling resistance. The present invention integrates the advantages of the concrete bridge tower and the steel bridge tower and has the advantages of high stability, high intensity and rigidity, light self-weight, good cracking resistance and easy construction, thus having a wide application prospect in the field of large-span bridge structure.

Description

technical field [0001] The invention relates to a composite structure bridge tower applied to a cable-stayed bridge or a suspension bridge, and belongs to the technical field of bridge engineering. Background technique [0002] Bridge towers are an important part of cable-stayed bridges and suspension bridges. At present, there are mainly two structural forms of concrete bridge towers and steel bridge towers. Concrete bridge pylons have low cost of materials and high structural rigidity, and the construction speed is faster when sliding formwork is adopted, so it is widely used in Europe and my country. However, concrete bridge towers often have disadvantages such as self-heavy weight, low seismic performance, high stress requirements for the substructure, complex reinforcement structure, and easy cracking, so there are many difficulties in construction and use. Compared with concrete bridge towers, steel bridge towers are lighter in weight and smaller in size, so they have...

AI Technical Summary

Problems solved by technology

However, the steel bridge tower structure has low damping and is prone to vortex-induced vibration and galloping. Since the section stiffness is small and mainly under compression, adverse effects such as local buckling and instability must be considered in the design, resulting in the use of thick steel plates, and Stiffening structure is complex

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