Research On New Technology For Replacing Simple Supported-Continuous Girder Bridge Bearing

This paper rely on science and technology project of Communications Department of Yunnan Province,study on construction method,girder body mechanics behavior and power monitoring system in the lifting process for the issue about the bearing replacement of high piers simple supported-continuous girder bridge in the mountain area,put forward the new method,index and strategy to the construction technology steps,the main girder safety evaluation and synchronous artificial control in the lifting process. The main contents and contributions of this dissertation are listed as follows:(1) Summary on the present situation and existing problems on the bridge bearing replacement technology and lifting power system at home and abroad.(2) It is detailed to analyze the old method of bridge bearing replacement,construction steps,application scope,advantages and disadvantages,on this basis,put forward the new bearing replacement method of high piers simple supported-continuous girder bridge in the mountain area.(3) Use the three-dimensional beam element simulative calculation to the lifting condition of the different simple supported-continuous girder bridge of relied project by MADIS/CIVIL,summarize the influence law and security evaluation index when hydraulic jack lift the beam body and evaluate jacking-up condition.(4) A distributed control system containing hardware and soft platform is established. The hardware platform is composed of industrial compute,programmable logical controller and hydraulic control system,and the software platform is consisted of monitor and bridge structural analysis software,analyze basic block diagram and basic structure,put forward a variable step size grey prediction artificial synchronous control strategy and a self-adaptive artificial synchronous control strategy based similitude degree clustering fusion to use in different condition.(5) Establish the failure conditions of plate rubber bearing using in simple supported-continuous girder bridge,put forward a practical control standard of monitoring stress,deduce the design formula of steel hoop.