Research On Construction Control Of Long Span Prestressed Concrete Continuous Rigid Frame Briges

Along with the augment of bridge span, construction control became more vital and attentional. In order to establish an easy and feasible construction method, took a certain bridge construction project in Wuhe express way as the example to study bridge construction control of long span continuous prestressed rigid frame bridges.Firstly, the contents and actions of bridge construction control were discussed . Then some typical methods of this kind of control were listed and compared with each other.Secondly, a bridge structure analysis software,BSAS,was used in the simulation of the bridge construction process for analysis the sensitivity of calculated parameters.The influences of parameter error to the deflection and stress of bridges were studied by changing the main parameter. The methods of parameters identification were analyzed and compared with each other, and the limitations of these methods were pointed out. A simple method was presented, which is adopting measured parameters to modify calculated parameters directly, then carrying on construction control with Gray Theory.Thirdly, the use of Gray Theory in long span continuous rigid frame bridge construction control was studied in this paper and calculated program about the Gray Theory used in this thesis was worked out by C++ program language. Figured out three gray models in order to predict deflection changes during segments construction, then can utilize these predicted values to work out the elevation of moulding board. slided average method of origin data serials was used in bridge construction control firstly.By using this method, data fluctuation and operation errors were reduced effectively through and the prediction accuracy of gray model was improved.Lastly, the deficiencies in this paper and further study of construction control were listed.