Tension-compression elastic support for improving stress of negative bending moment area of bridge and using method of tension-compression elastic support

Abstract

The invention discloses a tension and compression elastic support for improving stress of a negative bending moment area of a bridge and a using method.The support comprises a sliding module, a first rotating module, a second rotating module, a tensile module and a compression module, the first rotating module comprises a large spherical crown lining plate, a sliding friction pair is arranged on the large spherical crown lining plate, and the second rotating module comprises a second spherical crown lining plate; the first rotating pair is arranged on the bottom face of the large spherical crown lining plate and provides pressed rotating support for the support, the compression resisting module is arranged at the bottom of the first rotating pair and used for bearing compression vibration reduction and energy consumption, a first receding part is arranged on the top face of the large spherical crown lining plate, and the second rotating friction pair comprises a small spherical crown lining plate and a pulled spherical surface wear-resisting plate which are rotationally connected. The upper portion of the tensile module is fixed to the small spherical crown lining plate, the lower portion of the tensile module is elastically connected with the compression-resistant module, and when the tensile module bears the lift force of the small spherical crown lining plate, the elastic connection provides downward acting force, so that the small spherical crown lining plate is tightly attached to the tensile spherical wear-resisting plate. The problems that under the tension working condition of the support, the rotating function is prone to losing efficacy, and hard collision occurs due to the fact that the compression vibration reduction displacement exceeds the maximum displacement are solved.

Description

technical field [0001] The invention relates to the technical field of bridge supports, and more particularly, to a tension-compression elastic support for improving the stress in the negative bending moment area of ​​a bridge and a method of using the same. Background technique [0002] In long-span suspension bridges and cable-stayed bridges, some tension-compression bearings are often set at the main tower, auxiliary pier and transition pier to solve the vertical stress problem of the structure, especially for the composite beam using steel beam and concrete slab, the vertical The stress problem of the main girder at the auxiliary pier that is supported by the rigid support is more prominent, which will lead to the cracking of the concrete in the negative bending moment area of ​​the main girder. The vertical elastic support system can effectively reduce the stress of the main girder, improve the structural stress system, and the vertical elasticity The system needs to se...

AI Technical Summary

Problems solved by technology

At present, the tension and compression bearings of long-span bridges are mainly tensile and compression spherical steel bearings, tension and compression roller steel bearings, etc. The conventional tension and compression steel bearings are basically rigid systems in the vertical direction, that is, the vertical deformation of the bearings is not considered. It cannot meet the vertical elastic stiffness requirements of the elastic system of long-span bridges. Considering the vertical elastic stiffness in ordinary tension and compression steel bearings without affecting the normal use function of the bearing is a problem that needs to be solved in elastic bearings

[0003] There are several disadvantages in the prior art: (1) the elastic bodies in the existing tension-compression elastic bearings mostly adopt rubber elastic bodies or disc springs, and The same elastic body is used for the support in tension and compression, which results in the same stiffness of the support in tension and compression, which cannot meet the different stiffness requirements of the bridge support in tension and compression. It is not a good choice for the parameter selection of the vertical stiffness of the support Optimum; (2) The elastic body of the support deforms to the design displacement and then collides hard, which does not provide the function of buffering energy consumption, which will easily lead to damage of the support component when the limit displacement occurs, and affect the service life of the support

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