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Cold-formed structure connections utilizing gusset plates are usually semi-rigid. This paper investigates the behaviours of rectangular gusset plates in cold-formed connections of elements whose columns and beams are made with lipped back-to-back C-sections. Methods of calculating strength and stiffness are necessary for such semi-rigid joints. The main task of this paper is to determine a method capable of calculating these characteristics. The proposed analytical method could then be easily adapted to the component method that is described in part 1993-1-8 of the Eurocode. This method allows us to calculate both the strength and stiffness of rectangular gusset plates, assuming that the joint deforms only in plane. This method of design moment resistance calculation was presented taking into account that an entire cross-section shall reach its yield stress.A technique of stiffness calculation was presented investigating the sum of deformations acquired at the bending moment and from shear forces which are transmitted from each beam bolt group.Calculation results according to the suggested method show good agreement of laboratory experimental results of specimens with numerical simulations. Two specimens of beam-to-column connections were tested in the laboratory. Lateral supports were used on the specimens to prevent lateral displacements in order to better investigate the behaviour of the rectangular gusset plate in plane. Experiments were simulated by modelling rectangular gusset plates using standard finite element software ANSYS Workbench 14.0. Three-dimensional solid elements were used for modelling and both geometric and material nonlinear analysis was performed.

abstract. Nowadays, cold-formed constructions are being used more frequently on construction sites because of the good strength-to-cost ratio. However, insufficient studies are published examining the properties of these constructions. This paper investigates the behaviour of bolted gusset-plate joint since it is one of the easiest ways to connect a beam to a column. The paper presents analytical calculations using the component method and experimental test results. The joint was investigated using the mechanical model of three springs. The mechanical model for the calculation of bolt group stiffness was created according to Eurocode 3 Part 1-8 Stiffness formulations (EN 1993(EN -1-8 2005 (originally, it is recommended for elements that are 4 mm and thicker). The technique for the calculation of the stiffness of a gusset plate is presented. The strength of the joint was calculated using the technique introduced in

Nowadays, there is a growing tendency in the use of cold formed constructions, which may be explained by good strength to cost ratio. Thus, the goal of this paper is to review the behaviour of cold formed steel connection. The article reviews most up to date publications on testing and description of beam-tobeam, beam-to-column and truss connections. In brief, the properties of cold formed steel connections have been found to be semi rigid, where the main factor affecting stiffness is bearing forces around the bolthole. The article also focuses on the technique to increase stiffness of cold formed connections. Santrauka Apžvelgti mokslinės literatūros Šaltiniai apie Šaltai formuotų profiliuočių naudojimą ir jų jungtis. Kadangi Šie profiliuočiai yra gerų stiprumo savybių ir pigiau atsieina, tad nūdienos statyboje taikomi vis dažniau. Apibendrinami naujausi sijos su sija, sijos ir kolonos bei santvaros mazgų elgsenos tyrimai. Šaltai formuotų elementų jungčių elgsena yra kaip pusiau standžių mazgų. Pagrindinis veiksnys, turintis įtaką mazgo standžiui, yra varžtų glemžiamasis poveikis plonasienių elementų skerspjūvių sienelei. Pateikiama rekomendacijų, kaip didinti Šaltai formuotų profiliuočių jungčių standumą.

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