Long-span bridge three-sphere frictional sliding shock isolation support saddle

Abstract

The invention relates to a long-span bridge three-sphere frictional sliding shock isolation support in the aspect of bridge engineering field. The support consists of an upper support saddle plate, a movable slide block consisting of an upper segment and a lower segment, a middle sliding disk and a lower support saddle plate and is characterized in that the concave sphere of the upper support saddle plate is connected with the concave sphere of the middle sliding disk by the movable slide block consisting of the upper segment and the lower segment; the upper segment of the middle movable slide block is arranged in the recess of the lower segment; the upper segment and the lower segment are respectively provided with a convex sphere; and the convex sphere of the middle sliding disk is connected with the concave sphere of the lower support saddle plate. Within the range of calculable and controllable displacement range, the long-span bridge three-sphere frictional sliding shock isolation support changes the self rigidity and damping characteristics by the self-adaption behavior of the three spheres; for the multifunction objective or multilevel shock, the self adaptability is beneficial to respectively optimizing given shock isolation systems. The support saddle has simple structure, big vertical bearing capacity, big horizontal displacement, high durability and specific shock isolation mechanism, thereby being suitable for long-span bridges having high demand on shock resistant performance.

Description

technical field [0001] The invention relates to a bridge support device, in particular to a three-spherical friction sliding shock-isolation support applied to long bridges and capable of automatically varying stiffness and damping. Background technique [0002] When building bridges in earthquake areas, especially long bridges, the influence of potential earthquakes on bridges must be considered, the seismic design of bridges must be carried out, and special attention must be paid to the seismic details of bridge structures. Bridge anti-seismic design mainly includes three categories, one is the traditional bridge anti-seismic design, which is to resist and consume earthquake energy through structural components, and the earthquake action is used as an external load in the design, combined with other loads acting on the structure The second is bridge isolation design, which is to extend the period of the structure by introducing isolation devices to achieve the purpose of c...

AI Technical Summary

Problems solved by technology

[0004] Due to the low vertical bearing capacity and poor durability of various rubber bearings, they cannot be used in long bridges with heavy superstructure and large horizontal displacement requirements.

[0005] The friction pendulum system has a good effect on small and medium-span bridges, but due to a single friction surface, its stiffness and damping characteristics cannot be changed during the movement of the support, and there is no self-adaptive performance

Under strong earthquakes, the amplitude of horizontal displacement is limited, and it is difficult to ensure the large displacement of the upper and lower structures of long bridges under strong earthquakes

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