| More and more flexible components appear in large,high-rise structures such as tower cranes for high-rise buildings,transmission line tower construction,and antenna mast construction.As the height of the structure continues to increase,attachment becomes a necessity,and various attachment devices have emerged.As the attachment distance increases,the flexible member represented by the flexible cable begins to play its irreplaceable role.The rigid attachment devices commonly used in construction engineering and their corresponding design calculation methods have been studied by experts and scholars in the industry and colleagues in the engineering industry for many years,and have gradually matured in theory and practice.However,there are relatively few studies on flexible devices with flexible cables as the main attachment and support members.In recent years,with the increase in applications in various fields,they have been increasingly concerned by engineering and theoretical circles.This article starts with the stress characteristics of flexible cables,and analyzes the stiffness,strength,and stability of flexible supporting devices and their attached structures.It attempts to provide theoretical support and contribution within the design,calculation,and analysis of such structures.Aiming at three types of flexible cable attachment devices,such as cross-shaped,cross-shaped and symmetrical star-shaped,which are common in engineering,the force of the cable under different load types and different directions is studied,and the lateral rigidity of the corresponding attachment device is derived And torsional stiffness equations,the cable force expression of each attachment system is given,which provides a theoretical basis for the calculation and analysis of the stiffness and strength of the attachment structure.Taking the crane tower with flexible attachment at the end as the object,the influence of the pretension of the cable on the critical load of the axial compression of the bending column is analyzed,and the general expression of the characteristic equation of the structural stability of the tower with flexible support at the end is given;The effect of horizontal tension cables on the tower support stiffness and critical force,and then the tower support stiffness and stability of the double-side diagonal cable structure are studied,and the basic method for determining the equivalent support stiffness and solving the critical load of the tower structure is obtained.The analysis results show that the pre-tensioned double-sided cables have a parallel stiffness contribution to the lateral support stiffness of the tower body,which effectively improves the lateral support stiffness and the tower body’s anti-stability.For the general expression of the instability characteristic equation of the general flexible support tower structure,a simple and approximate solution for engineering application is given;for this paper,the accurate instability characteristic equation of the flexible support structure is obtained by ANSYS software dense element method The high-precision numerical solution is compared with the accurate characteristic equation solution and approximate analytical solution in this paper,which verifies the correctness of the accurate instability characteristic equation and the applicability of the approximate analytical solution in this paper. |
