Simulation Of Construction Mechanics And Monitoring For PC Continuous Girder Bridge

Construction mechanics and construction monitoring are new disciplines to study the complicated constructing of civil engineerings. Nowadays balanced cantilever-casting construction plays an essential role as an advanced erection craft for long-span PC continuous girder bridges, however, inter force and displacement are changed sophisticated in segments during the construction. To ensure safety and quality during the construction, especially for the geometrical aesthetic appeal, construction simulation and monitoring must be carried out.Firstly, the construction mechanics and simulation for long-span PC continuous girder bridge are integrated. Separately analyses from two aspects: on one hand, considered the geometrical transformation of structural model, re-distribution effects should account spatially for the sequence as well as the schedule of construction, such as cantilever segments cast-in place phase; temporary concretion free phase and close-up phase. On the other hand, considered the building materials performance and pre-stress loss by time, viewpoints and applicable parameters are proposed. As a whole, the computer programs available to track the stress and displacement history of segmental bridge are introduced, as the software simulation method, the two dimensional global FEM model and 3D partial FEM model are established separately in the paper.Secondly, the deflection surveying programmers and construction control method are elaborates, and the conception of geometric control of long-span PC continuous bridge is introduced. To ensure the aesthetical pleasing of the bridge, Smoothing spline method is brought forwardsin the paper. It is indicated that elevation adjustment should meet the smoothing impacts and fitting.Finally, monitoring results of the project of S249 Bridge across Beijing-hangzhou Grand Cannel are introduced, the real deflection, displacement and stress of segments are accordance with computing. The close-up error of the bridge is satisfied with the Chinese standard. The method of the paper is proved feasible for brige monitoring.