Research On Seismic Performance Of Continuous Concrete Rigid Frame Bridge With Long Spans And High Piers Under Strong Earthquake

China is a country of earthquake disaster occurred frequently.It will cause serious consequences when the bridges are destroyed even collapsed during the earthquake disaster. Long span concrete bridge is widely used in China and abroad with the development of the construction of science and transportation. This study is aimed to enhance the understanding of the seismic resistance capacity of this kind of bridge under strong earthquake based on Niu lanjiang bridge in Yunnan Province through some research methods such as Pseudo-dynamic test and numerical simulation.It provides the beneficial reference for the seismic design of rigid frame bridge and the construction.The following work has been done:1,Based on the theory of consistency similarity,as the size of the prototype structure and model structure size proportion is1:12, the scaled down model is designed for Pseudo-dynamic test of Niu lanjiang bridge.According to the comparison of strengths of the materials of C30,C40and M15using to the model obtained by the method of mortar echo,steel by the method of the tensile value and the standard method of the compressive and tensile strengths of materials, the reliability of the method of mortar echo is verified.2,it determines the actuator loading area that used in Pseudo-dynamic testing process through by analysing the factors of the structural style and the shape of the brisge. The possible larger deformation even failure parts for test reference point is determined.The concrete and steel strain gagas are used to obtain the test data.3,by importing the interpolating El Centro earthquake ground motion to the system to load on testing model with exchanging the signal in the computer,it can analyse the displacement,restoring force and strains of the testing model bridge encouraged by the El Centro earthquake ground motion with different acceleration peaks and get the result that the concrete and steel keep in elastic range in the model by different acceleration peaks such as0.6g..As the acceleration peak is0.1g,the south pier appears nonlinearity.The bridge has strong seismic capacity because of the flexural failure form with the horizontal annular fracture causing by the concrete tension in one side.4, the model analysis is accomplished by ABAQUS FEM software for Niu lanjiang bridge to get the types in different modes of Niu lanjiang bridge.Top ten modes occupy a leading position especially the first mode during the analysis.It makes the greatest contribution to the displacement and restoring force of the bridge.5,the model analysis is set up by ABAQUS FEM software for Niu lanjiang bridge under the El Centro,Taft and Wenchuan earthquake ground motion.Comparing the earthquake responsibility with the earthquake ground motion of different acceleration peaks by the method of dynamic analysis,the result is finding out the vulnerable spot of the bridge under the earthquake and how to resist the earthquake load in high seismic intensity area.