Self-resetting three-way limiting rubber support

Abstract

The invention relates to a self-resetting three-way limiting rubber support which comprises an upper support plate (3), a lower support plate (14), rubber laminated layers and shape memory alloy stranded wires (8), wherein the rubber laminated layers are placed between the upper support plate (3) and the lower support plate (14), the shape memory alloy stranded wires (8) are arranged around the rubber laminated layers, and the two ends of the shape memory alloy stranded wires (8) are connected with the upper support plate (3) and the lower support plate (14). Compared with the prior art, the self-resetting three-way limiting rubber support has great shock absorption and limiting capacity under the effect of horizontal and vertical earthquakes, falling-off damage of bridges is prevented, meanwhile, self-resetting of the bridges during earthquakes can be accelerated, in addition, the energy-dissipating capacity is achieved, damage of piers is reduced to the greatest extent, and the restorability of the bridges is improved.

Description

technical field [0001] The invention relates to a shock-absorbing support, in particular to a self-resetting three-way limiting rubber support. Background technique [0002] In bridge structures, it is usually necessary to install bearings between the bridge superstructure and substructure to resist external loads, temperature changes, earthquakes, etc. Nowadays, rubber bearings, which are widely used, can stably support the upper structure and reduce the vertical transmission of seismic energy, but their horizontal stiffness is low, and it is easy to produce uncontrollable shear deformation under large earthquakes, resulting in damage to the bearing. , or even falling beams, causing serious consequences. [0003] Chinese patent CN201410385289.3 discloses a one-way shock-absorbing and isolating lead rubber bearing. In the limit plate of the length, the limit plate is fixed with the upper support plate by bolts, and a reserved hole is set in the center of the support, and t...

AI Technical Summary

Problems solved by technology

This kind of support is a fixed support during normal use. The lead core is sheared under the action of a large horizontal force. The sliding of the upper support plate and the overall shear deformation of the rubber steel plate stack resist the horizontal effect. However, there are three very prominent problems in the design of this kind of anti-seismic bearing: first, the sliding of the upper bearing plate can only produce a certain displacement, and cannot realize effective energy consumption. impact

Second, although the overall laminated rubber steel plate can produce shear deformation, this deformation is an uncontrollable factor. When the lateral seismic action is too large, shear failure is likely to occur, causing serious consequences

Third, this type of support does not provide a corresponding limit device in the vertical direction. Under a large vertical action, the upper support plate and the limit plate are easily separated from the lower structure. If there is a horizontal displacement at the same time, it will failure of the support

This support also has two more serious problems: first, it uses steel cables to limit the position. Due to the low energy dissipation performance of the steel cables, it cannot play a good shock absorption effect under horizontal action. Large plastic deformation will occur in the state, and it is not easy to recover after being subjected to a certain level of action

Secondly, this type of twisted wire installation does not fully consider the movement of the upper and lower support plates. When relative movement occurs, two shear surfaces will be formed on the inner edges of the upper and lower support plates, which will easily cause shear damage to the steel cable. Reduced support reliability

Finally, the durability of the steel cable is poor, which increases the cost of maintenance and replacement during long-term use. At the same time, the installation form of the steel cable is too simple, the flexibility is extremely poor, and it does not have a wide range of applications under complex and variable earthquake conditions applicability

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