Vertical rigidity changeable shock insulation support saddle

Abstract

The invention relates to a vertical variable-rigidity seismic isolation bearing, belonging to the field of structure ventilating control. The bearing comprises steel tubes, rubber, a lead core, a variable-rigidity guiding device. The variable-rigidity guiding device includes a shaft, a top plate and tapered variable-rigidity curve plate, wherein the upper end of the shaft is fixedly connected with the top plate, one end of the tapered variable-rigidity curve plate is fixedly connected with the top plate, the other end is fixedly connected with the side surface of the shaft, multiple layers of rubber and multiple steel tubes are alternatively arranged on the shaft below the variable-rigidity curve plate, the lead core arranged horizontally intersects with the shaft through the multiple layers of rubber and the multiple steel tubes, the lower end surfaces of the rubber and the steel plates form a tapered space having a small upper end and large lower end. The bearing has large initial rigidity and small yield rigidity in the vertical direction, and has enough vertical deformability and reset ability, after the lead yields, the vertical seismic isolation rigidity can be adjusted according to the vertical deformation, thus vertical earthquake can be effectively insulated, and the bearing the stable when no earthquake occurs.

Description

technical field [0001] The invention relates to a vertically variable stiffness shock-isolation bearing, which belongs to the field of structural vibration control. Background technique [0002] It is generally believed that horizontal earthquakes play a controlling role in structural damage, but a large number of earthquake damage shows that the impact of vertical earthquakes on structures cannot be ignored, especially high-rise structures, long-span structures and uneven vertical distribution of mass and stiffness The vertical stiffness of these structures is generally small, and the vertical natural period is similar to the excellent period of vertical ground motion. Therefore, it is very easy to cause resonance and damage during an earthquake. How to control vertical ground motion has become a research hotspot for scholars from all over the world. [0003] Base isolation technology is to reduce the basic frequency of structural vibration and prolong its vibration period ...

AI Technical Summary

Problems solved by technology

[0004] However, the current seismic isolation technology is mainly horizontal seismic isolation, which has no control effect on vertical seismic motion, which is extremely unfavorable to structural safety; in addition, the development of vertical seismic isolation technology for structures is slow, because the seismic isolation device must first undertake the upper It is difficult to reconcile the contradiction between the huge self-weight load of the structure and the requirement of small vertical stiffness, while ensuring the stability of the upper structure under the action of general loads (such as environmental vibration and wind load). The research and development of a new type of vertical vibration isolation device has become a worldwide problem

[0005] For the vertical seismic isolation of structures, scholars at home and abroad have proposed some seismic isolation devices. Due to the high vertical stiffness and small deformation of some devices, it is difficult to provide sufficient damping force within the limited deformation range, and the seismic isolation effect is not good; Some devices have small enough vertical stiffness, but the deformation is too large, it is difficult to ensure the stability of the upper structure under general load, so it is difficult to be applied and popularized

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