On relationship between internal force of the main materials of transmission towers and horizontal displacement of foundations
The foundation of transmission iron tower may produce vertical and horizontal displacement during geological dis-asters.People have paid more attention to the influence of vertical displacement of tower foundation on the internal forces of components in tower,the horizontal displacement also has a significant impact on internal forces of tower components.Hence,it's important to study the relationship between horizontal displacement of tower foundations and tower safety.In order to de-rive the equation for the relationship between the horizontal displacement and internal force of tower main material by energy method and stiffness equivalence method of beam and rod.The proportional relation of bending moments sustained by four tow-er legs under the action of horizontal displacement of single leg is given.The maximum bending moment of main material at the first cross-grid surface is deduced.The maximum axial force expression of each leg of tower main material under the action of horizontal displacement of single leg is given by simplified model.The expression of the maximum axial force is modified through FEM.The upper external loads of transmission tower generated axial forces in main materials,but the horizontal dis-placement of the foundation mainly generated bending moments of main materials.In this paper,the expression of the internal forces of main materials and displacement of tower leg can be used as the basis for the safety assessment of tower after the hori-zontal displacement of transmission tower.
transmission towerhorizontal displacement of tower foundationinternal forcesfinite element modification
NETL
NSTL
万方数据
