Dynamic Load Test Analysis of Multi-arch Rib Special-shaped Bowstring Steel Arch Bridge
Through the actual dynamic load test of the multi-arch rib special-shaped bowstring steel arch bridge,the main test content,test method and test result analysis of the dynamic load test of the special-shaped arch bridge are introduced in detail.Through field test and theoretical calculation and analysis,the measured values of each order natural frequency of the bridge structure are larger than the theoretical calculation values,which indicate that the actual structural stiffness of the bridge is better than the theoretical stiffness.The measured damping ratio of the bridge is between 0.145％and 0.390％,which belongs to the normal range.The main vibration mode of the bridge is the first-order torsion of the main beam and the first-order lateral bending of the arch rib.The lateral stiffness of the arch rib is relatively weak.The measured impact coefficient of the bridge under various driving conditions is between 1.04 and 1.20,which is close to the impact coefficient 1+μ=1.05 used in the design,and meets the requirements of the specification.
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