Jinan Yellow River Bridge, The Beijing-shanghai High-speed Rail By The Force Of Performance Analysis

The Jinan Yellow River Bridge is a five-span, rigid-frame girder, flexible arch bridge with span arrangement (112+3×168+112)m on the high-speed railway from Beijing to Shanghai. The bridge allows four lines high-speed railway. The railway deck adopts the structure of orthotropic monolithic steel deck, which works with the main truss working condition. The Bridge is one of the major projects of Beijing-Shanghai High Speed Railway. The mechanical behaviors of the full bridge together with one joint of The Jinan Yellow River Bridge were studied systemically in this paper. Main work of this paper is as follows:1. The space finite element model of the full bridge was established by adopting SPB( Space Plate-Beam) method. The stress performance of main truss and deck under dead load and four lines live load was studied. The results show that the working condition of the bridge is reasonable; the intensity and rigidity meet the requirements.2. The transect structure with K-struts and middle boom of the main truss has greatly reduceded the the out-of-plane bending moment of vertical bars, decreased the vertical bending stress of cross beams, improved the sress of steel deck. This transect structure can be used to the multiple-line railway bridges with great lateral width.3. The stress performance of the Jinan Yellow River Bridge under the worst-case load was studied. The results are as follows: comparing the results of under the worst-case load and full-span distributed live load, the difference of the main truss internal force between the two load cases is distinctly, even as much as several times; the incresment of stringers and transversal girder stress is little. Therefore, the stress analysis of main truss should consider the worst-case load, the stress analysis of the deck can only need the full-span distributed live load.4. The structure of the main truss joints is rather complicated. The analysis of the full bridge is not enough meticulous to reflect the stress distribution of the joints. Therefore, the local analysis is required to the joints with consideration structural details. The principle and method of interception on the joints was proposed, and the technique of internal force boundary on finite element model of joints was proposed.5. With consideration structural details, the finite element model of joint E20 was established by using shell elements. The local stress analysis was done to the joint model under the combined loads of dead load, four-line live load and horizontal wind load. The results show the total stress level of gusset plate, cantilever diaphragm and the main weld links is low. The degree of stress concentration and equivalent stress are high at the top of connection between cantilever diaphragm and lower chord girder web plate, on the joining between gusset plate and the end of vertical bar, diagonal, which should be paied more attention to.The production of this paper can server the design of Jinan Yellow River Bridge and provide references for other similar structures.