Method for determining optimal horizontal stiffness and damping value of dynamic vibration absorption type high pier-beam connection

Abstract

The invention provides a method for accurately calculating the optimal horizontal stiffness and damping value of dynamic vibration absorption type high pier-beam connection and provides a scientific theoretical basis and specific practical guidance for the calculation of the bearing stiffness and damping value of the dynamic vibration-absorbing high pier beam bridge. The method comprises the following steps: 1. establishing a seismic finite element analysis model of the dynamic vibration-absorbing high-rise beam bridge; 2. initially determining the horizontal connection stiffness k and dampingc of the pier-beam elastic connection device; 3, applying a harmonic response analysis load at the pier top joint, and drawing the amplitude / frequency curve corresponding to the displacement or acceleration dynamic result of the pier top; 4. in the top displacement or acceleration amplitude frequency curve, determining whether there are two vertices (P point and Q point), and adjusting the pier-beam connection stiffness and carrying out repeated testing if there don't have obvious double vertices; 5, determining whether the two points P and Q are equal, if the P and Q points are not equal, continuously adjusting the pier-beam connection stiffness for repeated trials until the P and Q points are equal, at this time the connection stiffness is the optimal horizontal connection stiffness; and 6. adjusting the pier-beam connection damping for trial and error, so that the two points P and Q become the peak points on the amplitude-frequency curve. At this time, the connection damping is theoptimal horizontal connection damping.

Description

technical field [0001] The invention relates to the field of anti-seismic technology of bridge engineering, in particular to a method for determining the optimal horizontal stiffness and damping of a dynamic vibration-absorbing high pier girder pier-beam connection. Background technique: [0002] Patent CN 106120545 A proposes "a method of improving the seismic performance of bridges by using beam bodies", that is, the design method of dynamic vibration-absorbing high-pier girder bridges. The basic principle is as follows: through numerical modal analysis or experimental modal testing, the longitudinal and the transverse natural frequency f i , Equivalent modal mass M i and modal stiffness K i ;Determine the mass m of the beam body i ;Calculate the connection stiffness k between the beam body and the pier i ;Calculate the connection damping c between the girder body and the pier i ; Select the above connection stiffness k i and connection damping c i The value of the ...

AI Technical Summary

Problems solved by technology

However, for the dynamic vibration-absorbing high-pier girder bridge structure, the beam body is used as an additional mass body relative to the pier body, and its mass ratio μ does not meet the design condition

Therefore, the optimal horizontal connection stiffness and damping of the dynamic vibration-absorbing high-pier girder bridge structure cannot be directly determined by the above classical formula

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