Model Test Research Of High Piers And Large-span Continuous Rigid Frame Bridge

High piers or ultra-high piers combined with large span bridge, frequently, appear in the area of mountains and hills highway, when need across deep groove valley or be applied to special auxiliary bridge. prestressed concrete continuous rigid frame bridge with strong ability to adapt to the terrain, Large spanning capacity and reasonable cost. Therefore, high piers and large span continuous rigid frame bridge are widely used. Related to this bridge structure is also in-depth research and discussion. in accordance with the structure of test theory, theory of geometric similarity, physical similarity theory to build scale models of the physical structure, The study of continuous rigid frame bridge pier rational design and correct calculation with important significance. research the type of bridge construction process deformation and stress variation with important practical significance.Model is based on physical prototypes (real structure) in accordance with the law of geometric similarity copied into representative material, it has part of or all the characteristics of real structure. through the test of model structure, the structure test can get similar with the real work and working conditions, For further to understand and study the performance of the real structure. this article describes the theoretical basis of the model-three similarity laws and static and dynamic model norms. and on this basis, established a model similarity to a constant test. discusses the detail of the high piers and large span continuous rigid frame bridge overall model design, model making, the purpose of static and dynamic tests, test content, load step, test equipment, data acquisition System. the upper structure of the model is modeled on the Laozhuanghe bridge of the western channel (baotou-beihai Line). substructure is modeled on luohe bridge of baobei line. Luohe bridge, the main span of 170m, side span of 100 m. Luohe bridge large piers up to 142m. the full-bridge model is modeled on simulation modeled 1/10 of the two bridges. through the model test collected experimental data of five load cases the stress and displacement change of key sections. stress major test of the largest bridge cantilever, bridge cross close case or cross-border close case. bridge deck pavement dead load case and live load conditions case analysis of a three-dimensional solid model, through The finite element software calculated were compared with test data. then obtained in each condition of stress law changes. emphasis verified actual project stress state and evaluate operating performance of the late bridge. finally, the experimental error of the model and model test of the bridge should pay attention to some of the issues in the discussions and recommendations.Research in this thesis purpose is to conduct a comprehensive understand work performance of high piers and large span continuous rigid frame bridge. to evaluate the operational performance of the bridge provide a reference for future and accumulation of certain scientific information.