Construction Monitoring Simulation Of The Prestressed Concrete Continuous Bridges And Analysis Of Partial Stress Of Zero Blocks

Due to continuous prestressed concrete beam bridge with stiffness, deformation, flat deckcurve characteristics and ride comfort, is one of the bridge are widely used at home andabroad, the main construction method for the cantilever construction method. Cantileverconstruction process in order to achieve the desired objectives, including the geometry andinternal force requirements, construction control simulation analysis, finite element model,simulation analysis for each construction phase structural internal force and deflectionchanges take certain construction control measures so as after the bridge deck linear structuralinternal force and meet the design requirements.Construction control calculation methods are: dress calculation,flip calculation,unstressedstate law. As the actual bridge construction process and uncertainties affecting the variousloads, and the ideal situation there is a big bridge construction errors, control errors generallyused for the construction method of least squares adjustment and Kalman filtering.Object of study is the span prestressed concrete continuous beam60+105+60m, the useof finite element program construction process simulation analyzes and extracts the maximumcantilever stage,Cross Close stage,cross-fold stage, bridge stage, operational phase bridgeconstruction phase of the internal forces and other key figure, but analysis of the bendingmoment and stress changes in these critical stages of construction. Comparing measured bythe monitoring and construction phase and strain level theoretical calculations, testconstruction control.Zero block of continuous beams is a complex force structure, is the main load-bearingpart, especially in the biggest boom phase under enormous loads. Using truss model does notaccurately reflect the true local stress distribution, so the use of FEA software to build Zeroblock model for local stress analysis, respectively horizontal and vertical, main stress Zeroblock floor roof, diaphragms web distribution to calculate and analyze the situation, the localstress analysis zero block number zero blocks for solving large crack this problem isimportant and guiding role.