Moment Resisting Connection with Curved Endplates: Behaviour Study

Abstract

This article provides a behaviour analysis of moment resisting joints with curved endplates. This is a new type of connection that can be used for joining steel beams to the circular hollow section (CHS) columns by means of bolts. Some researchers apply the Eurocode model without considering the differences in calculation schemes and assumptions, such as by using the general model of an equivalent T-stub in tension. Consequently, many of the existing behaviour studies are somewhat misleading, thus there is a need for further research. Apart from the absence of analytical methods that are devoted to predicting the initial stiffness and strength of the curved T-stub, other technical difficulties were encountered, such as gaps between the endplate and the column, as well as the initial pre-loading force of the bolts. In the previous studies, endplates were manufactured by rolling flat plates to the precise curvature which resulted in firm contact. In contrast, in this study, endplates were manufactured from a standard CHS tube, which led to significant initial gaps. Meanwhile, in terms of preloading force, it was found that it affected the moment resistance of the joint. This paper discusses problems associated with ongoing researches and presents experimental tests of the two connections. The obtained results were further used in the parametric finite element analysis (FEA) to determine the effect of the gaps and preloading force of the bolts on the moment resistance and initial rotational stiffness of the joint. The results indicate that the behaviour of curved plated connections is exceedingly complex and that the preloading force is the key factor, therefore, it should be controlled.

Analytical Model for the Prediction of the Elastic Response of Curved T-Stubs

“…If the bolt forces can be directly measured by strain gages, the tension force acting on the T-stub component depends on the lever arm of internal forces z, which adds an additional layer of discrepancy. In previous study (Mudrov et al, 2021), the finite element analysis was implemented to determine the size of a lever arm. It was found that lever arm depends on the initial imperfections and that it is not constant, as the centre of compression tends to move outwards due to rotation of the joint.…”

Plienbetonio kompozitinės kolonos ir plieninės sijos mazgo elgsenos analizė

“…Disertacijos tema yra publikuoti 7 moksliniai straipsniai: trys -referuojamuose Clarivate Analytics Web of Science duomenų bazės leidiniuose, turinčiuose citavimo rodiklį (Mudrov et al, 2021a(Mudrov et al, , 2021b; vienaskonferencijų rinkiniuose, referuojamuose Clarivate Analytics Web of Science duomenų bazėje (Mudrov et al, 2019a); du -kitų tarptautinių duomenų bazių leidiniuose (Mudrov et al, 2019a(Mudrov et al, , 2022, vienas -konferencijų medžiagose (Mudrov, 2019c…”

“…Nustatyta, kad jėgų pasiskirstymas lenktų tėjinių elementų varžtuose priklauso nuo tėjinio elemento ir varžtų standžių. Skyriaus tematika paskelbti keturi autoriaus straipsniai (Mudrov et al, 2021a(Mudrov et al, , 2021b(Mudrov et al, , 2019c.…”

“…Seven scientific publications were published on the dissertation's topic: three in the reviewed scientific journals referenced in the Clarivate Analytics Web of Science database and with a citation index (Mudrov et al, 2021a(Mudrov et al, , 2021b; one in conference proceedings referenced in the Clarivate Analytics Web of Science database (Mudrov et al, 2019b); two -in an international database (Mudrov et al, 2019a(Mudrov et al, , 2022; one in conference proceedings (Mudrov, 2019c). The dissertation results were presented at three scientific conferences:…”