Abstract
Transmission tower connection joint is an important connection component of the tower leg member and diagonal member. Its axial stiffness directly affects the stable bearing capacity of a transmission tower. The axial stiffness of the joint is mainly related to the connection form of joint. This paper takes the double-limb double-plate connection joint as the research object. Through the comparative study with the single-limb single-plate connection joint, the influence law of single-limb single-plate and double-limb double-plate joint on stable bearing capacity of quadrilateral transmission tower is studied from three aspects of model test, theoretical analysis and numerical simulation. Through the scale model test, it is found that the elastic stiffness of the double-limb double-plate joint is 3.12 times that of the single-limb single-plate joint, which can increase the bearing capacity of the joint by 26.1%. Through the energy method, the theoretical calculation expression of the stable bearing capacity of the quadrilateral tower considering the influence of the axial stiffness of the joint is derived. Compared with the effect of the single-limb single-plate connection joint, the double-limb double-plate joint can improve the stable bearing capacity of the quadrilateral tower by 15.6%. Considering the influence of geometric nonlinearity of tower and connecting joint, it is found that the double-limb double-plate connecting joint can improve the nonlinear stability bearing capacity of a transmission tower by 14.9%. The results show that the double-limb double-plate connection joint can not only improve the bearing capacity of the joint, but also greatly improve the stable bearing capacity of the tower. The research results can provide reference for the engineering application and design of double-limb double-plate connection joints.
Highlights
With the increasing energy demand worldwide, the development of power technology plays an important driving role [1,2]
In the traditional transmission tower structure design, the space truss method with hinged joints is often used to calculate the internal force of the tower, without considering the impact of joint stiffness on the transmission tower structure, which may have potential safety hazards and material waste
Ma et al [7,8,9] studied the mechanical properties of the new beam column connection joint of long-span steel hyperbolic tower under out of plane bending moment and shear through test and numerical simulation, and further studied the role of the joint in the stability of the cooling tower based on the test results
Summary
With the increasing energy demand worldwide, the development of power technology plays an important driving role [1,2]. Liu et al [17] proposed an effective method to consider the chord connection area in the finite element model of tubular transmission tower in linear elastic stage through theoretical analysis. He et al [18] studied the influence of the performance of beam column joints in box section on the continuous collapse resistance of the structure through test and numerical simulation. The mechanical characteristics of the new type of double-limb double-plate joint and its influence on the stable bearing capacity of quadrilateral tower are studied through test, numerical simulation and theoretical analysis. The tensile bearing capacity test of double-limb double-plate joint is designed and carried out in order
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