Construction Monitoring Simulation Of The Continuous Rigid Frame Bridge And Analysis Of Partial Stress Of Zero Blocks

In recent years, prestressed concrete continuous rigid frame bridge, which has aproperty of bond of beam and abutment, not only maintain the advantage of comfort ofcontinuous girder, but also decrease maintenance cost because that there is no bearing of"T" rigid frame, which has been developed rapidly. Continuous rigid frame bridgenormally uses cantilever construction method, and in order to ensure bridge alignmentand internal forces to meet design requirements and construction safety during theconstruction process, the construction of the bridge must be monitored.This article takes the No.2Bridge across the Mogu River as research background,and the main contents are as follows:(1) Introduce continuous rigid frame bridge and construction control briefly. Itincludes: development and features of continuous rigid frame bridge; the importance,contents and influencing factors of construction control.(2) Introduce the theory which is used in the process of construction simulationanalysis. It includes: the computational method on construction control, the finiteelement theory, the concrete shrinkage and creep and the temperature effect.(3) Utilize the finite element software CSRB and MIDAS/Civil to establish thetruss model, and carry out the bridge simulation analysis.The internal force resultswhich are calculated by the two software are compared and the results are moreconsistent; also analysis the displacement and linear of every construction phase.(4) In the alignment monitoring part, introduce the calculation of formworkelevation, lay out and measure the alignment survey points, and also compare the sitemeasured elevation with the design elevation. In the part of stress control, the choice ofstress measurement instrument, the embedment of stress sensor and the layout of thestress points are presented, and the actual measured stresses are compared with thecalculated stresses as well.(5) Because forces of rigid frame bridge zero-block are quite complex and it isprone to crack in construction process, analysis of partial stress for the zero-block of theNo.2Bridge across the Mogu River is carried out by ANSYS program. And it alsointroduces the establishment process of solid model, calculates the loading whichextracts from MIDAS results, analyzes stress of the roof, floor, web and diaphragm, andit finally comes up with locations of possible cracks on the zero-block with the combination of the stress analysis results.