earticle

영어

Current design practice of electric transmission tower is based on allowable stress design. But, it is difficult to find the reason for collapse of the transmission tower by the above design approach since the collapse occurred by secondary large deformations based on material and geometrical nonlinear behavior. The influence factor for the nonlinear behavior is mainly residual stress, initial imperfection and end restraints on members. In past study, necessity of the nonlinear analysis is examined through the comparison between elastic analysis and inelastic analysis. In this study, to reduce the complexity caused by the nonlinear analysis, a new
analytical method (equivalent nonlinear analysis technic) is proposed. To confirm the reliability of the proposed, the computed ultimate load of transmission tower using the method was compared with that of the nonlinear finite method. Also, electric transmission tower experienced actual collapse in the past was analyzed by the proposed method and the cause of collapse was
examined. Finally, the result of this study will be utilized in order to apply LRFD design approach to electric transmission tower design specification.