An inclined bridge seismic damper and its parameter optimization method

Abstract

The invention discloses an oblique type bridge anti-seismic damper and a parameter optimization method thereof, and relates to the technical field of bridge seismic resistance. The parameter optimization method comprises the following steps: establishing a bridge dynamic finite element model, calculating and obtaining a horizontal seismic dynamic response result and a longitudinal seismic dynamic response result of a bridge; optimizing a horizontal equivalent damping coefficient Ct, a longitudinal equivalent damping coefficient C1 and a speed index alpha of the oblique type bridge anti-seismic damper; calculating an oblique included angle beta and a damping parameter C of the oblique type bridge anti-seismic damper; and outputting the equivalent damping coefficient Ct, the longitudinal equivalent damping coefficient C1, the speed index alpha, the damping parameter C and the oblique included angle beta which satisfy the practical bridge design requirement. According to the oblique type bridge anti-seismic damper and the parameter optimization method thereof provided by the invention, when the bridge has a horizontal seismic action and a longitudinal seismic action, the oblique type bridge anti-seismic damper can play a role in damping energy dissipation, so that an effect of using only one set of oblique type bridge anti-seismic damper to control the longitudinal and horizontal seismic actions synchronously can be achieved.

Description

technical field [0001] The invention relates to the field of bridge anti-seismic technology, in particular to an obliquely placed bridge anti-seismic damper and a parameter optimization method thereof. Background technique [0002] With the development of my country's bridge design and construction technology and the needs of economic development, a large number of long-span bridges have been built; cable-stayed bridges are one of the preferred options for long-span bridges. In order to extend the period of bridge structures and reduce the impact of tower columns under earthquake Internal force, full floating system cable-stayed bridges are more and more widely used. However, due to the less constraints of the fully floating system cable-stayed bridge, the longitudinal and transverse displacements of the main girder of the cable-stayed bridge under the earthquake are relatively large, so it is necessary to take corresponding measures to control the displacement of the main gi...

AI Technical Summary

Problems solved by technology

When an earthquake occurs, the viscous damper will constrain the longitudinal displacement of the main girder of the bridge; however, the lateral seismic force of the tower column will be relatively large, and the transverse wind-resistant bearing needs to adapt to the longitudinal displacement of the main girder, so that the lateral anti-wind The structural design of the wind support has certain difficulties

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