Design method for combined shock isolation device under near-fault seismic effect

A design method and seismic isolation technology, applied in computing, bridge construction, special data processing applications, etc., can solve problems such as inability to reduce seismic isolation, poor seismic performance of seismic isolation devices, etc., to achieve enhanced safety and easy fine-grained design And control, reduce the effect of inertia force

Active Publication Date: 2018-01-12
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a combined shock-isolation device under near-fault earthquakes in view of the lack of common bearings in the prior art that cannot absorb and isolate shocks, and the shock-resistant performance of the shock-isolation device is not good. Design method, in order to achieve the above-mentioned purpose of the invention, the present invention provides the following technical solutions:

Method used

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  • Design method for combined shock isolation device under near-fault seismic effect

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Embodiment 1

[0024] A design method for a combined seismic isolation device under the action of a near-fault earthquake. The combined seismic isolation device includes a buffer anti-drop beam device and a friction pendulum support, such as figure 1 , the design method of the combined shock-isolation device comprises the steps:

[0025] (1) Assuming that the natural vibration period corresponding to the initial elastic stiffness of the combined seismic isolation device is in the platform section of the response spectrum curve, obtain the initial value of seismic force Q (1);

[0026] (2) Make the combined shock-isolation device in the elastic working stage, known the yield displacement of the buffer anti-drop beam device under the effect of the initial value of seismic force Q (1), obtain the elasticity of the combined shock-isolation device Initial stiffness value k(1);

[0027] (3) Obtain the initial value t(1) of the natural vibration period of the structure through the weight of the up...

Embodiment 2

[0034] A bridge, including a combined seismic isolation device and a friction pendulum bearing, the combined seismic isolation device is designed using the design method of the combined seismic isolation device under the action of a near-fault earthquake as in Example 1.

[0035] A kind of bridge, adopt the combined shock-isolation device designed as the design method in embodiment 1 between one side of each main girder and the bridge pier, only adopt the friction pendulum bearing between the other side and the bridge pier, wherein, the combination In the step (7) of designing the shock-isolating device, the yield shear force of each of the combined shock-isolating devices is obtained according to the stiffness distribution between the two combined shock-isolating devices and the two ordinary supports. The bridge using combined shock-isolating devices and friction pendulum bearings is beneficial to save costs, increase installation speed, and speed up construction progress.

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Abstract

The invention provides a design method for a combined shock isolation device under the near-fault seismic effect. The combined shock isolation device is formed by a friction pendulum support and a buffer collapse-proof device so that the friction pendulum support and the buffer collapse-proof device dissipate energy in a unified and coordinated mode, during anti-seismic design, technical parameters of the devices in the combined shock isolation device are combined and designed according to the actual bridge requirement, fine design and control are easy, it is ensured that the upper structure has the high deformation capability and it is also ensured that beam collapse is avoided; the phenomenon that material waste or insufficient anti-seismic property is caused due to design performed according to the theoretical condition, reinforcing steel bar consumption is reduced, the energy consumption effect of the combined shock isolation device is improved, and inertia force of the upper structure is effectively reduced, so that lower structures such as a pier and a foundation are protected, distribution of earthquake force under the lower structures is adjusted, the bridge anti-seismic property is improved, it is ensured that no beam collapse is caused under the major earthquake condition, meanwhile, the support is protected against serious damage, the safety is enhanced, and the post-earthquake bridge maintenance cost is lowered.

Description

technical field [0001] The invention relates to the technical field of anti-seismic design of bridges, in particular to a design method of a combined shock-isolation device under near-fault earthquake action. Background technique [0002] In the near-fault region, there are two main characteristics of earthquake ground motion: one is the forward directional effect and the backward directional effect determined by the fault mechanism and the direction of fault diffusion; the other is the permanent ground displacement caused by the slip direction of the fault effect. The ground motion caused by the forward directional effect is a dynamic vibration process in the form of double-sided reciprocation, and its displacement time history is a step-type pulse, and its velocity time history is a strong pulse with large value, long period, and short duration. , which is the biggest difference between the near-fault earthquake ground motion and the far-field earthquake ground motion. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50E01D19/00E01D19/04
Inventor 曾永平陈克坚樊启武董俊庞林郑晓龙杨国静陶奇苏延文徐昕宇
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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