Research On Displacement Calculation Of Lattice Tower Based On Nonlinear Distribution Of Base Reaction

In the operation of the transmission line,the lattice transmission tower will be displaced under the load.Excessive displacement will cause the conductor to deviate from the design position,leading to hidden dangers and even serious accidents.In this paper,based on the nonlinear distribution of the base plate base reaction force and considering the interaction between the tower and the base plate,the theoretical calculation method and finite element simulation of the transmission line tower displacement are carried out.In this paper,based on the force balance equation of the thin plate and the geometric characteristics of the thin plate,a nonlinear model of the distribution of the exponential function of the base thin plate base under eccentric load is constructed by numerical integration and other methods.Based on the double cosine series,the expressions of the solution of the deflection,load,and base reaction force of the base plate are developed,and the corresponding boundary conditions and bending equations are used to establish a series of equations of the deflection and internal force of the base plate.Calculation formula of displacement of foundation plate in exponential function distribution model.The space tower structure is decomposed into four monolithic structures,and the force received by the tower body structure is equivalent to the four monolithic structures according to the principle of load equivalence,considering the influence of the deformation of the tower chord and web rod on the displacement and Based on the influence of foundation plate displacement settlement on tower displacement,a theoretical calculation method of lattice tower displacement on flexible foundation plate was established,and the calculation example of the tower model is calculated analysis.Using the large-scale engineering finite element analysis software ANSYS,in this paper,the finite element analysis of the lattice transmission tower model displacement is carried out under different load conditions,obtaining the corresponding tower displacement;Research work of the different size of the foundation plate width to height comparison grid on the influence of the displacement of the transmission tower model is carried out.Through the research work in this paper,the experimentally validated nonlinear exponential function distribution model of the foundation plate containing the aspect ratio coefficient is used to accurately describe the nonlinear distribution of the foundation plate base reaction force;Based on the reaction force of the base of the nonlinear exponential function distribution model,the theoretical calculation method of the displacement of the lattice transmission tower on the flexible foundation plate was developed to obtain the theoretical calculation method of the displacement of the lattice transmission tower;Based on the lattice tower displacement calculation method,the theoretical calculation and finite element simulation analysis of the tower model calculation example are carried out.The research results show that the finite element results of the tower model calculation example agree well with the theoretical calculation results,with an average error of 4.48%;When the width-to-height ratio of the foundation slab is greater than 2.5,the greater the width-to-height ratio of the foundation slab of the tower,the greater the displacement of the tower.The width-to-height ratio of the foundation slab has an effect on the tower displacement.