Structure Analysis And Research Of Jinma (Gloden Horse) Bridge

The Jinma(Golden Horse) Bridge is a dramatic new concrete single-towered cable-stayed bridge on the Guang(zhou)-Zhao(qing) highway. Its main span is 283m. It is one of the largest of this type in the world. The Jinma Bridge consists of a large single-towered structure rigidly connected to two balanced-cantilever approach structures. The symmetry, stiffness and efficiency of the arrangement made for a very economical, yet aesthetic solution. The formation of Jinma Bridge, projects comparison, new design method and calculation both on static and dynamic and the detail problems were presented in this paper in order to investigate this new structure and analyze the detail problems of this design. The main contents and the final conclusions of this thesis are as follows:1. A new bridge structure cooperated by the single-towered cable-stayed structure and the rigid frame structure was presented. Many aspects of Jinma Bridge are researched and analyzed, such as the design method, configuration of the superstructure, section choice of the tower, design and construction methods of the deep-water bases, the stiffness of the cooperated rigid frames, strengthening way in the tower. It is concluded that this new structure is the economical, aesthetic and suitable project for the large-span situation.2. A new design and construction method different from the traditional way was used in Jinma Bridge. When cantilever the main girder of the cable-stayed structure, the longitudinal pre-stressed reinforcements are not tensioned at once. This new erection procedure is compared with the conventional way from the reasonability, convenience and economic aspects. The results obtained from the calculating data state that cantilevering the main girder without tensioning the longitudinal pre-stressed reinforcements is a better way for establishing the cable-stayed bridge.3. The effective width of the deck of the cable-stayed bridge is up to profound research because there is no exactly definition in the applicable design standards. Based on the achievements done by others and the feature of superstructures, we establish the segment models under the different loads for the FEM calculating of the deck and make it for the final conclusion that the distribution of the stresses in the deck of this main girder are uniform.4. The side girders, the deck and the lateral beams of the cable-stayed structure are cast-in-place at one time. Some experts once suspected that the reserve pre-stresses in the lateral beams are not enough. In order to settle this problem, three construction schemes are analyzed comparatively. The results indicate that the pre-stresses in the lateral beam are acceptable and tensioning the reinforcements by two steps is the appropriate method both for the girder and the lateral beam.-II-5. With the consideration that the cross section of the cable-stayed structure and the rigid frame structure's are not uniform, a new joint solution was presented for these different sections. The FEM and the Light-Elastic experiment methods were used to analyze the joint zone and the results indicate that the proposed method is reasonable and convenient for this bridge.6. Uses the response spectrum method and the random seismic response method to analyze the anti-seismic capacity of Jinma Bridge. The anti-wind capacity also to be investigated by using the existing formula and the segment model experiment. The results obtained from the analysis show that the capacities of the anti-wind and anti-seismic of this bridge can be assured with the reasonable structure layout and section design although its span is very large.