Tensile stress-type horizontal limiting sacrifice device

Abstract

The invention discloses a tensile stress-type horizontal limiting sacrifice device. The device comprises at least one shock isolation bearing body, a bearing base plate, a bearing roof plate, a shear resistance gear block, a steering block and a tensile anchor nail, wherein the steering block comprises a steering block bottom plate, a steering block side plate and a plurality of steering block rib plates; the steering block bottom plate is located inside the shear resistance gear block and arranged on the bearing base plate through the tensile anchor nail; the steering block rib plates are located outside the bearing roof plate; the steering block bottom plate is provided with a long round hole for being passed through by the tensile anchor nail, and the tensile anchor nail is provided with a U-type incision of a long flat bottom and large radian. According to the tensile stress-type horizontal limiting sacrifice device, by using the steering block to change the horizontal limiting force into the pulling force of the tensile anchor nail, the complex shear stress distribution on the shear section of the shear key mode is avoided, and the tensile anchor nail only bears the pulling force, so that the tensile stress of the section is more evenly distributed. The tensile anchor nail adopts the U-type incision of the long flat bottom and large radian to achieve a limited ductile failure characteristic, thereby reducing the influence of stress concentration and improving anti-fatigue load of the whole device.

Description

technical field [0001] The invention relates to the technical field of shock absorption of bridge engineering structures, in particular to a position-limiting sacrificial device. Background technique [0002] According to the requirements of relevant technical specifications in our country, the applicable conditions and design methods of bridge vibration reduction and isolation are clearly stipulated, which greatly promotes the practical application of vibration reduction and isolation technology in the field of bridge engineering in my country. my country's bridge shock-isolation devices mainly adopt velocity-dependent and displacement-dependent structures. [0003] When the elastic bearing capacity of the above two structures cannot meet the bearing capacity requirements under normal service conditions, generally a "sacrificial" limit device is mainly added. [0004] The "sacrificial" limit device in our country's prior art generally adopts a shear tenon with a defect set...

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Problems solved by technology

[0006] 1. The shear stress distribution of the shear tenon section with V-shaped or U-shaped notch is complex. Only when the shear tenon section is small, the fracture surface is relatively fixed, and the dispersion of the breaking force can be well controlled (≤15%). When the demand for breaking force is large, group nails have to be used. However, since the failure mode of the shear tenon is basically brittle failure, it is difficult to ensure that the group nails can reach the maximum resistance at the same time.

[0007] 2. The stress state of the shear tenon should generally be guaranteed to be a pure shear state. This requires high precision for the fixture structure and installation of the shear tenon. It has a great influence on the stress distribution of the shear surface, which in turn affects the breaking force of the shear tenon

[0008] 3. The use of V-shaped or U-shaped notches will inevitably lead to complex stress concentration phenomena in the shear section of the shear tenon, so the fatigue resistance of the shear tenon is generally poor. In order to prevent the shear force under normal use Tenon fatigue damage must also greatly increase the monotonic shear resistance of the shear tenon, which will inevitably lead to a larger seismic force transmitted from the upper structure to the lower structure during an earthquake

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