Mechanical model for stiffness calculation of the column tension zone in double-sided joints assembled with long bolts

Manuel Lopez , Alfonso Loureiroa , Ruth M. Gutierreza , Jose M. Reinosa

Abstract

Steel joints play a crucial role in the overall behavior of structures. As a result, both researchers and practitioners have made significant efforts to improve joint design and develop reliable calculation methods. One widely adopted solution for assembling joints with hollow column sections is the use of long bolts, typically consisting of threaded rods with nuts, this approach also enhances both stiffness and resistance. However, long bolts have not been extensively studied in cases where the column is an open section, nor are there established formulations for their structural analysis in such configurations. Therefore, this paper proposes a mechanical model to calculate the stiffness of the tension zone of the column when the joint is assembled using long bolts. The mechanical model is applicable to symmetrically loaded double-sided joints in which the column is an open H or I section, connected using long bolts. It consists of three components: the column flange in bending, the column web in tension, and the long bolts in tension. The proposed formulation is supported by an experimental campaign of six specimens, as well as a parametric study using calibrated finite element models. The numerical models were calibrated against experimental results, specifically force-displacement and force-deformation curves.

Key Words

bolted steel joints; component method; experimental tests; finite element model; long bolts

Address

Manuel Lopez — Structural Analysis Laboratory, CITENI, Ferrol Industrial Campus, University of A Coruña, Mendizabal s/n Campus de Esteiro 15403 Ferrol, Spain
Alfonso Loureiroa — Structural Analysis Laboratory, CITENI, Ferrol Industrial Campus, University of A Coruña, Mendizabal s/n Campus de Esteiro 15403 Ferrol, Spain
Ruth M. Gutierreza — Structural Analysis Laboratory, CITENI, Ferrol Industrial Campus, University of A Coruña, Mendizabal s/n Campus de Esteiro 15403 Ferrol, Spain
Jose M. Reinosa — Structural Analysis Laboratory, CITENI, Ferrol Industrial Campus, University of A Coruña, Mendizabal s/n Campus de Esteiro 15403 Ferrol, Spain

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