The Constructional Supervisory Control And Stability Analysis Of Thin-walled High Pier And Long Span Continuous Rigid Frame Bridge

High pier and long span bridge technology is suitable for railway and highway in mountain area. High pier and long span bridge has the characteristics of high bridge pier, thin-walled box girder, which makes the entire and part structural stiffness degrade and its stability becomes prominent. In this paper, an engineering case is considered, which is a long span continuous rigid frame bridge with thin-wall high-piers, build on Zhang Jiajie-Hua Yuan highway in Hu Nan province. Using the bridge design software Dr. bridge to calculate and guide site operation, linear control and stress control. The stability of the high-piers during the construction stage and completion stage is analysed by using the current FEM software MIDAS/CIVIL, the main work is as follows:1. Based on the general situation of Zhang Jiadong bridge project, formulate the main construction control contents of Zhang Jiadong bridge, then divide the construction phases of the bridge, and list part of alignment and stress results in constructional superviso-ry control, its results accord with the design requirements.2. According to the structure of the bridge, respectively use beam element and plate element to build the largest cantalever and completion stage model, and analysis the construction of the bridge. It focuses on thin-walled high piers’stability analysis of linear and nonlinear in the construction and completion stage. From the analyzed results we can see, there is enough safety storage. Finally, parameters that The unilateral sunlight, Pier concrete grade, Thin-walled hollow pier wall thickness, the thickness and position of lateral clapboard, environmental temperature and wind load affect the stability of the bridge are analyzed, which provide a theoretical basis for the preliminary design of the bridge. The result shows that the bridge has enough safety storage.