Model Test Study Of High Pier Continuous Rigid Frame Bridge With Large Span Double Leg Thin-walled

In the western region,due to the limitation of terrain conditions,the highway bridge often crosses the steep canyon,and the double leg thin-walled high pier continuous rigid frame bridge is the ideal bridge under the complex terrain conditions such as deep trench.At present,domestic and foreign scholars who study on the long-span continuous rigid frame bridge has carried out a large number of research,and the results is relatively mature.However,there are relatively few studies on the quasi-static and anti-ultimate ultimate bearing capacity of long-span continuous rigid frame bridge.In this paper,under the engineering background of the main bridge construction monitoring of Zhang jia jie Tai Chi River Bridge,using 12#pier as the research object,making the scale model 1:16,the quasi static and anti thrust limit bearing capacity test of crfb,the main contents are as follows:(1)Based on the basic theory of structural model test,the similarity of stress,strain and displacement under the concentrated load is derived by the method of dimensional analysis.The experimental model of the 12#pier of the main bridge of Tai Chi River Bridge in Zhang jia jie is studied.According to the purpose of the experiment,the loading scheme,the load condition,the test section,the measuring point arrangement and the test scheme are designed.(2)Finite element analysis of the bridge using finite element analysis software MIDAS/CIVIL2016,and the pier in different working conditions,pier pier bottom cross beam section of strain theory,the displacement theory of pier cross-section,strain theory value obtained by comparing the measured value and the displacement theory and construction monitoring of the value of that the bottom of the pier and pier cross section of strain monitoring section and the value of the pier top displacement monitoring section of the measured values were less than the calculated value,and the monitoring value is consistent with the calculated value change trend.(3)According to the division of the cantilever construction process stage bridge,the actual test of loading force mode design model of the pier,for cyclic loading test of model piers,and during the test observation of specimens of cracks and the failure mode.The theoretical data obtained from the finite element model are compared with the experimental data and the test data of the test pier and the original pier monitoring data.And from the analysis of the failure characteristics,hysteretic curves,energy dissipation,skeleton curve and stiffness degradation characteristics,it is found that the mechanical behavior and failure mechanism of the double thin walled high pier.(4)Space finite element model is established to solve the model pier anti thrust bearing capacity by using finite element software ANSYS,and through the comparison of model test analysis,test that the test pier anti thrust limit bearing capacity values and the calculated values are basically the same,and the error is relatively small.The test pier calculated results and test results of similarity ratio reduction,then compare with the original bridge pier,found its agreement is relatively high,the test pier pseudo static test the experimental values of mechanical properties to the original pier reaction to a certain extent.(5)Finally,the conclusion is drawn from the experimental data and theoretical data.