A Method of Using Beam Body to Improve the Seismic Performance of Bridges

Abstract

The invention discloses a method for improving the seismic performance of a bridge through girders. Under the conditions that the external added mass does not need to be introduced, and the installing space does not need to be found on pier bodies, harmful vibration of bridge piers at the natural frequency band is effectively eliminated, the stress of the pier bodies is reduced, and the seismic performance of the bridge piers is improved. The girders, the bridge piers and a support system arranged between the tops of the bridge piers and the longitudinal end portions of the girders are included. The method comprises the following steps that the natural vibration frequency fi, the equivalent modal mass Mi and modal rigidity Ki of the bridge piers in the longitudinal direction and the transverse direction are obtained through the numerical value modal analysis or the experiment modal test; the mass mi of the girders is determined; the connecting rigidity ki between the girders and the bridge piers is calculated; the connecting damping ci between the girders and the bridge piers is calculated; and the support system with the values of the above connecting rigidity ki and the above connecting damping ci is selected, and in the other words, the girders can serve as a power vibration absorber for improving the seismic performance of the bridge piers.

Description

technical field [0001] The invention relates to the anti-seismic technology of bridges, and more specifically relates to a method for improving the anti-seismic performance of bridge piers by using beam bodies, especially the anti-seismic technology suitable for high-pier long-span bridges. Background technique [0002] The anti-seismic technology of bridges has always been the focus of attention of professional designers, especially for the anti-seismic design of high-pier long-span bridges, there is currently no relevant standard specification. Currently, there are two commonly used anti-seismic methods for bridges. One is to improve the anti-seismic performance by increasing the strength and deformation capacity of the pier structure itself, that is, relying on the damage of the pier itself to dissipate the seismic energy, such as setting a plastic bridge at the bottom of the pier. Hinge etc. Another commonly used method is to use shock-absorbing and isolating bearings. ...

AI Technical Summary

Problems solved by technology

However, due to the limitation of the installation space of the pier body, the additional mass is small, and the anti-seismic effect has not been improved.

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