Research On The Behavior Characteristics Of Unsymmetric Concrete Filled Steel Tubular Arch Bridge

concrete filled steel tubular arch bridge is great developed and widely applied over the past two decades in China, for its great spanning ability, outstanding adaptability,bearing capacity and convenient construction method. But, study on unsymmetric concrete filled steel tubular arch bridge which built on rough terrain is relatively lag. To approach a fuller understanding on the force characteristics of this unsymmetric structure, This thesis base on the load test of Yesanhe bridge, Through calculation and analysis by MIDAS/Civil, figure out the force characteristics. Comparing and analyze the calculated data and experimental data, make an evaluation on force characteristics of the bridge. in this paper, the specific work incluses several aspect as follow:1. the structural feature and development condition of concrete filled steel tubular arch bridge is discussed. Carry out the study on structural feature, mechanical behavior, and application scope of unsymmetric arch bridge.2. Establish the finite element model of Yesanhe Bridge by using finite element analysis software MIDAS/Civil, calculate and analyse the force characteristics, the theoretical frequency and modal shape of natural vibration,buckling mode and stability coefficient are obtained after analyzing the finite element model.3.the stress and deflection of the control sections are test in static load test. in the dynamic load test.Natural vibration characteristics, damping ratio and driving vibration are tested, the impact effect of the bridge structure under various driving vibration is analyzed. and compare with the theoretical value. By the contrast analysis, the calculation results are verified, the reasonable evaluation is given. The test results show that the bridge structure design is reasonable, and the bridge has enough strength and stiffness, as well as good dynamic characteristics.