Flutter Controlling Effect and Mechanism of Central Stabilizer of Liu Jiaxia Bridge

Abstract

Wind-induced vibration is the constraint of large-span bridge design; search for effective inhibition of wind-induced vibrations of bridge aerodynamic measures is particularly important. Through combination of wind tunnel experiments and theoretical analysis, the effectiveness of the central stabilizing plate on the wind-induced vibration control of Liu Jiaxia bridge and controlling mechanism were analyzed. The main contents are as follows: The original truss bridge section flutter test performance does not meet the requirements of the wind speed, through a variety of control measures flutter selection, the results show that the measures of central stabilizer plate has better inhibition of vibration. Through the wind tunnel test, the measures of central stabilizer plate on the impact of the truss bridge aerodynamic derivatives were researched. Aerodynamic derivatives is reduced with the wind speed increases of good aerodynamic shape of the cross section, the absolute value is large than the original cross-section; By using two-dimensional three degrees of freedom coupling flutter analysis method, the law of development of twisting motion aerodynamic damping and flutter morphology were analysis. The performance of the main beam flutter was improved through icreasing torsional movement of pneumatic positive damping A, reducing torsional coupling movement implicated generated aerodynamic negative damping term D or enhancing the level of participation in the sport of vertical curve shape of flutter effective vibration control.