The Static And Dynamic Analysis Of Structure Of Chaozhou Bridge

Based on the Chaozhou Bridge project, the static and dynamic analyses of structure of Chaozhou Bridge were performed in this thesis. First, the structural design of Chaozhou Bridge was carried out. Then, seismic resistance analysis of and wind-resisting analysis was followed through, and the key parts of the bridge was examined by checking calculation. The main research contents are as following:a) The cable-stayed main bridge of Chaozhou Bridge was modeled using the finite element software ANSYS. Stress analysis was performed for the overall-structure of the bridge, the joint area between the tower and beam, the tower column, the pedestal of pylon tower, the bearing platform, the horizontal beams and the anchor blocks of the cable, respectively.b) Spatial finite element model was established for the cable-stayed main bridge and the approach spans of Chaozhou Bridge, respectively, using the finite element software MIDAS/Civil. Seismic response analysis was performed for the rigid-frame system and the semi-floating system of the bridge under the E1and E2earthquake loading, by using the response spectrum method together with time history analysis. Seismic resistance capability of the rigid-frame system was checked. The cases of with or without vibrating isolation for the continuous beam of approach spans of Chaozhou Bridge were compared by conducting analysis using the response spectrum method.c) The flutter stability of the cable-stayed main bridge of Chaozhou Bridge was investigated by establishing spatial model using the finite element software MIDAS/Civil.The main conclusions are as following:a) The rigid-frame system can satisfy the seismic requirements of the cable-stayed main bridge of Chaozhou Bridge. This system not only facilitates construction procedures and but also can avoid replacement of the bearing during operation. It is recommended to use rigid-frame system for constructing the main structure of the cable-stayed main bridge of the Chaozhou Bridge.b) The use of rigid frame system for the12#-(4×50) m continuous beam structure and the13#-(50+2×75+50) m continuous beam structure satisfy the requirements for seismic resistance.c) The stress states of the columns and beams of the pylon tower, the pedestal of the tower, the bearing platform and the tie beams are acceptable, as well as the stresses for the joint area between the tower and beam. The girder beam of the tower would surfer larger stresses and there is a stress concentration at the cable-anchor block. However, if the pre-stressed tendon steel were used, the stresses at the girder beam of the tower and the cable-anchor block both meet the requirements of regulatory.d) The cable-stayed main bridge of Chaozhou Bridge possesses high torsional stiffness for the state of biggest single or double outrigger; both during and after construction. Meanwhile, the girder beam section shows a good capability in aerodynamic performance and the structure turns out good stability in resisting wind.e) Concrete box girder with single section three rooms was used for the main girder of the cable-stayed main bridge of the Chaozhou Bridge. The critical wind speed for the separated flow torsional flutter is less than that for torsional-coupling flutter. At the state of both largest single or double outriggers during or after construction, both the two critical wind speed are greater than the wind speed for flutter test. The results show that the structure safety the requirements of wind resistance.