Stress Analysis Of The Oval Steel Bridge Tower And The Pier Tower Junction

ABSTRACT:Due to its high degree of industrial assembly, lightweight and a rich variety of designs, steel tower has been widely applied in new cable-stayed bridge constructions. The steel-concrete joint of pier tower junction is the stiffness irregularity point from the tower body to the whole structure and also the weakest point of the structure. Thus whether this joint can transit stiffness and transfer forces smoothly is the critical issue to a successful structure design. Taking the Shanshui No.1steel tower cable-stayed bridge as the project background, the stress states of the tower and the local forces of the junction are analyzed under different load conditions, and then, the impact of different parameters are investigated.Firstly, a model of the Shanshui No.1steel tower cable-stayed bridge is established with the help of the finite element software Midas Civil. Six load conditions are calculated to know the overall force distribution of steel-tower bridge under the most unfavorable load combinations, and the calculation results are used as the boundary conditions of local stress analysis of steel-concrete joint. Then, the finite element software Midas FEA is applied to analyze steel-concrete joint of the pier tower junction. The results show that the overall stress of joint is reasonable and can meet the design requirements.In the local stress analysis of the steel-concrete joint,5parameters are taken including the strength grade of concrete, the hole diameter of PBL shear bond, the thickness of the perforated plate, the install of ribbed plates and the height of the cast-in-place concrete in tower for parameter study on the steel-concrete joint. Results show the value of each design parameter is reasonable in the design of the Shanshui No.1bridge. The analytical results also provide valuable reference for determining strength grade of concrete, the hole diameter of shear bond, the thickness of the perforated plate, the install of ribbed plates and the height of the cast-in-place concrete in tower for similar bridge tower design.