Limit Wind Loads of a Concrete Filled Steel-tube Transmission Tower
Limit wind loads of a Concrete Filled Steel-Tube (CFST) transmission tower in a long-span tower-line system is computed. Firstly, fine Finite Element Method (FEM) model of the tower and its MultipleDegrees-Of-Freedom (MDOF) model are built and the material nonlinear models including steel-tube and CFST are also modeled. Secondly, based on MDOF model, mean displacements under mean wind force are evaluated and the Root Mean Square Displacement (RMSD) under fluctuating wind force is also evaluated by random vibration theory. Then, Equivalent Static Wind Loads (ESWL) are computed considering the first three order modes. Finally, based on FEM model, the nodes are loaded by the ESWL and the nodal loads increase step by step in order to impel materials into plastic status until calculation can not converge. Plastic analysis shows the towers failure is caused by steel-tube element failure and the CFST elements have enough strength reserve. The towers three kinds of limit wind loads are computed based on different references and it is suggested to select the limit wind loads, whose corresponding wind velocity is 69.7m/s, as the design limit wind loads of the tower.
Limit load, Wind load Equivalent static wind load Transmission tower Elastic-plastic analysis
Tie Hua Xiong Shu Guo Liang
School of Civil and Architectural Engineering, Wuhan University, Wuhan, China
国际会议
上海
英文
1697-1704
2011-10-21（万方平台首次上网日期，不代表论文的发表时间）