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Volume Title: ICASGE2021

DOI: ICASGE-STL

M.A. DABAON; M.H. EL-BOGHDADI; M.F. HASSANEIN and A.M. TAHA

Latticed steel transmission towers (LSTTs) are built using bolted joints. However, the performances of these bolted joints are complicated. The stress distribution and forces acting on the bolts depend on the stiffness of both the bolts and the connecting steel elements. Consequently, an exact theoretical analysis for design purpose is practically not possible. Instead, the bearing design of bolted shear joints can be performed by means of reliable empirical formulae available in design guides or codes under different loadings but not for shear. On this context, in order to have a good structural evaluation model for the bolted joints of LSTTs which are subjected mainly to shear forces, the component based method (CBM) is suggested to be used. This method is widely accepted as a reliable tool in determining the stiffness of the joints based on the equations presented in EN 1993-1-8. The currently considered CBM considers the structural steel joint under shear loading as a multi-spring model containing springs in series, which enables obtaining its force-displacement relationship in case of semi rigid joints. A validation scheme is currently considered based on previous experimental works of shear bolted connections available in the literature. The comparisons based on a simple formula (including the connected plates in tension, bolt in shear and plate in bearing) shows a good agreement with the experimental results and it is valid for elastic analysis.

: Towers Joints Stiffness; Latticed Steel Towers; Transmission Towers; Shear Bolted Connections; Component Based Method