Truss Stiffening Suspension Bridge Cantilever Erection And Stability Study

First of all, this thesis introduces the different construction processes and stability problems during construction of suspension bridge stiffening beams briefly, then recalls the domestic and overseas actuality about stability study when the suspension bridge and cable-stayed bridge stiffening beams are constructing. Therefore, the research content is as fellows: truss stiffening suspension bridge cantilever erection and stability study.The thesis instances the constructing Baling River Bridge, presents the entire simulation calculation methods when a deck loop wheel machine is adopted during stiffening beams cantilever installation construction process, establishes the full-bridge model of space nonlinear analysis during constructing , researches the impact on structure construction internal forces of deck loads installed in batches and boundary conditions on beam during stiffening beams installation phase, researches the impact on structure and construction of hinges effect , the number and location of hinges during stiffening beams installation phase.The thesis presents the truss elastic stability analysis full-bridge model when deck loop wheel machine is adopted during stiffening beam cantilever installation construction process, calculates and studies structure elastic stability when a deck loop wheel machine is adopted during stiffening beam cantilever installation construction process, researches the impact on structure elastic stability of deck loads installed in batches and boundary conditions on beam during stiffening beams installation phase, researches the impact on structure elastic stability of installing temporary hinges during stiffening beams installation phase.Finally the thesis compares the elastic stability calculation results during cantilever erection when the truss stiffening beam suspension bridge segments are wholly rigid connection and rigidity - hinge connection, selects a few disadvantageous work conditions to study the ultimate bearing capacity when geometric and material double non-linearity are considered, shows the rule of structure ultimate damage when truss stiffening beam suspension bridges are erected using cantilever.The thesis has guiding significance to construction scheme when truss stiffening beam suspension bridges are erected using cantilever and actual construction.