Wind stability analysis and design plan contrast of the main bridge of Pinghai Bridge

摘要

For the auxiliary pier and not model, the dynamic mode calculation during and after construction, the flutter wind speed assessment, the critical flutter velocity calculations after construction and the actual flutter wind speed calculations of the structure in the largest cantilever state during construction are respectively conducted for the main bridge of Pinghai Bridge. The strength of the saving auxiliary pier structure was checked for the standing state of the naked tower, the largest double-cantilever state during the construction phase and under the gale loads after construction stage. The results show that the flutter stability index and the critical flutter wind speed after construction will not change with the setting of auxiliary piers; the flutter critical wind speed during the construction phase is controlled by the largest single-cantilever state and not affected because of the setting of auxiliary piers. These conclusions have some significance on the bridge wind stability analysis.