High-speed rail bridge shock-absorbing bearing and shock-absorbing method with high damping and self-resetting

Abstract

The invention belongs to the technical field of bridge construction earthquake prevention and disaster mitigation, and relates to a high-damping self-resetting shock-absorbing support for a high-speedrailway bridge and a shock-absorbing method. According to the high-damping self-resetting shock-absorbing support for the high-speed railway bridge and the shock-absorbing method, the installation and disassembly of the high-damping self-resetting shock-absorbing support are in basic consistency with the installation and disassembly of a normal pot rubber support, so that construction installation is convenient, later maintenance and changing work are also convenient, the cost of the shock-absorbing support is meanwhile comparatively low, and the shock-absorbing support thus has comparativelygood popularization and application prospects; a sliding plate has a sufficient surface area to provide sufficient vertical supporting force to meet the requirement for a vertical carrying capability; and a first steel wire rope damper is arranged between an upper support and a lower support, the energy consumption performance of high damping of the steel wire rope damper and the self-resetting performance of a friction pendulum support can be used, the shock-absorbing support can be adapted to multidirectional seismic force action, and is suitable for the daily operation of the high-speed railway bridge and a fault-nearing earthquake area, and the shock-absorbing support has a comparatively good application prospect in a fault-nearing area.

Description

technical field [0001] The invention belongs to the technical field of earthquake prevention and disaster reduction for bridge engineering, and relates to a high-damping self-resetting high-speed rail bridge shock absorption bearing and a shock absorption method. Background technique [0002] Unlike far-field earthquakes, near-fault earthquakes have rich low-frequency components, and seismic waves have short-duration high-energy pulse characteristics (such as figure 1 , figure 2 As shown), the engineering structure is seriously damaged. The construction of the high-speed railway network needs to be built in some near-fault areas, such as the western region, and the high-speed railway bridges in the near-fault areas need to be designed for shock absorption and isolation to reduce the damage caused by earthquakes. [0003] High-speed rail bridge structures can use shock-absorbing and isolation bearings, friction pendulum isolation bearings and bearing isolation technology t...

AI Technical Summary

Problems solved by technology

First of all, the self-weight of the bridge structure is large, and the reaction force transmitted to the support is huge. However, the area of ​​the hinged slider of the current friction isolation pendulum bearing is small, and the compressive stress it bears will be very large, which will cause the hinged slider to collapse. Damage will directly affect the normal use of the support

Secondly, the friction isolation pendulum bearing only considers the longitudinal and horizontal earthquake action, and the actual earthquake action includes longitudinal, horizontal earthquake action and vertical earthquake action. This kind of friction isolation pendulum bearing cannot effectively Reduce the effect of earthquake force

Third, the high-speed rail bridge structure has very strict requirements on the deformation of the bearing. The traditional friction isolation pendulum bearing will have a large lateral displacement under the normal high-speed train running, and it is not easy to reset, which threatens the safety of the train.

Therefore, it is inappropriate to directly apply the existing friction isolation pendulum bearings to the structural bearings of high-speed railway bridges. It is necessary to develop a seismic isolation bearing with greater stiffness and greater damping that can adapt to three-dimensional seismic forces.

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