Vol. 18, No. 2, pp. 574-584 (2022)
THEORETICAL STUDY ON EARLY STAGE SELF-LOOSENING OF
BOLTED JOINT IN LATTICE TRANSMISSION TOWER UNDER TRANSVERSE LOAD
Wen-Qiang Jiang 1 *, Ze Mo 1, Lan-Qi Yang 1, Jing-Li Liu 2, Zhuo-Bo Niu 2 and Li-Qiang An 1, 3
1 Department of Mechanical Engineering, North China Electric Power University, BaoDing, P. R. China
2 Baoding Power Supply Company, Baoding, P. R. China
3 Hebei Key Laboratory of Electric Machinery Health Maintenance & Failure Prevention, North China Electric Power University, BaoDing, P. R. China
*(Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 18 March 2021; Revised: 25 September 2021; Accepted: 10 October 2021
DOI:10.18057/IJASC.2022.18.2.6
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ABSTRACT
Bolted joints are one of the key components of lattice transmission towers. Under alternating transverse loads, the preload of bolted joints will be reduced, which may cause bolt loosening and consequently change the inherent mechanical properties of the bolted joints and eventually trigger the structure failure. In order to study the critical loosening load of bolted joint in lattice transmission tower under the transverse load, the mechanical models of bolted joint with single shear plane and double shear planes are established. A new theoretical method of critical loosening load with considering the deformation of bolt screw threads is derived. The thread stresses of two typical bolted joints are given and compared with that from finite element method, which verified the accuracy of the new analytical method. The influences of bolt preload, friction coefficient of thread surface, bolt clamping length and number of shear planes on the critical loosening load of bolts are studied.
KEYWORDS
Lattice transmission tower, Bolted joint, Bolt loosening, Transverse load, Theoretical study
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