Double-curved-surface spherical seismic mitigation and absorption supporting base with limiting device easy to replace

Abstract

The invention belongs to the technical field of bridges and building structures, and provides a double-curved-surface spherical seismic mitigation and absorption supporting base with a limiting device easy to replace. The double-curved-surface spherical seismic mitigation and absorption supporting base with the limiting device easy to replace comprises an upper base plate (6), a middle base plate (4) and a lower base plate (1). The end of the upper base plate (6) is provided with the limiting device corresponding to the lower base plate. The limiting device is composed of a pressing plate (9) and a limiting plate (10). The pressing plate (9) and the upper base plate (6) are combined in an embedded mode and are connected into a whole through an anti-draw screw II (13). The limiting plate is connected with the pressing plate (9) through an anti-draw screw I (12) and an anti-shear pin (11). The anti-draw screw I (12) is close to the lower base plate (1). The anti-shear pin (11) is far away from the lower base plate (1). The double-curved-surface spherical seismic mitigation and absorption supporting base ensures that the anti-shear pin bears the pure shear effect rather than bending moment effect on the horizontal force effect, and has the advantages of being easy to operate and facilitating replacement.

Description

technical field [0001] The invention belongs to the technical field of bridges and building structures, and in particular relates to a hyperboloid spherical shock-absorbing and isolating support with easily replaceable limit devices. Background technique [0002] At present, domestic shock-isolation bearing products often need to be equipped with corresponding limit devices. The function of the limit device is to make the support play a limiting role under normal conditions and frequent earthquakes. It is an ordinary hard-resistant bearing; when the seismic force on the bearing is greater than the design force of the limit device, the limit device needs to be sheared and damaged without affecting the sliding of the support, and the shock-absorbing and isolating bearing plays the role of shock-absorbing and isolating; Therefore, the limit device is an important carrier to realize the transformation of the function of the shock-absorbing and isolating support from the ordinary...

AI Technical Summary

Problems solved by technology

But the actual situation is that when the support bears the horizontal force, it often produces a large additional bending moment on the limit device, and the shear pin or shear bolt may be subjected to a large bending stress in advance, resulting in the support under normal conditions or more In the case of earthquakes, it will be destroyed in advance and cannot play a limiting role; in addition, the limiting ring is in the shape of a ring, and when the support is stressed in a certain direction, the shear pins or shear bolts set by the limiting device in the direction of the force The force is large, but the force away from this direction or the opposite direction is small, and the force state of the limit device is extremely uneven, which makes it difficult to control the design force of the limit device

[0004] Since the shear pins or bolts and the upper seat plate are tightly fitted or threaded, the limit device of the shock-absorbing support is destroyed and removed after the earthquake, but the remaining shear pins or shear bolts inside the upper seat plate of the support Parts are difficult to remove, making replacement of the seat stop very difficult

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