DESIGN RESISTANCE OF WELDED KNEES IN STEEL FRAMES

The paper presents issues related to calculations of welded knee joints, in which the interconnected load-bearing elements, beams and columns, can be made from plate girders with slender webs. At the beginning, a typical knee joint of portal steel frame was characterized, along with presentation of calculations for the internal forces in characteristic zones of the knee, i.e. in tension, shear, and compression zone. Then, the checking procedures of resistance were presented in detail for each designated knee zone, paying particular attention to the influence of complex stresses state and loss of stability in the shear and the compression part of knee joint. The work also presents a comprehensive calculation example, which illustrates the described method usage in practical design of welded knees of steel frames.

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[1] Joint in steel construction. Moment-resisting joints to Eurocode 3. The Steel Construction Institute, The British Constructional Steelwork Association Ltd. Publication P398, 2013.

[2] Kozłowski A., Pisarek Z.: End-plate steel joint with four bolts in the row. Proc. of Inter. Conf. of Met. Struct. (ICMS-2006), Rzeszów, Poland, 21–23 June 2006.

[3] Ślęczka L.: Shaping and analysis of selected steel frame joints subjected to variable actions. Oficyna Wydawnicza Politechniki Rzeszowskiej, Rzeszów 2013 (in Polish).

[4] EN 1993-1-8:2005. Eurocode 3: Design of steel structures –Part 1-8: Design of joints.

[5] Pałkowski Sz.: Selected problems of calculation and design of steel structures (in Polish), Koszalin 1989.

[6] Giżejowski M., Jemioło S.: Numerical modelling of the behaviour of welded, semi-rigid end plate joints (in Polish). Inżynieria i Budownictwo, no 11, 2004, pp. 623–629.

[7] Scheer J., Pasternak H., Schween T.: Structural behavior of stiffened knee joints with thin webs. Journal of Structural Engineering , vol. 117, 1991, pp. 2600–2619.

[8] EN 1993-1-1:2005. Eurocode 3: Design ofsteel structures – Part 1-1: General rules and rules for buildings.

[9] EN 1993-1-5:2005. Eurocode 3: Design of steel structures – Part 1-5: General rules – Plated structural elements.

[10] Wakasugi S.: Buckling of a simply supported equilateral triangular plate. Trans.Japan Soc. Mech. Eng. vol. 26, no. 164, 1960, pp. 538–544.

[11] Wakasugi S.: Buckling of a simply supported triangular plate having inner angles of 30, 60 and 90 degrees. Trans. Japan Soc. Mech. Eng. vol. 19, no. 83, 1953, pp. 530–537.

[12] Faella C., Piluso V.,‎ Rizzano G.: Structural Steel Semirigid Connections: Theory, Design, and Software. CRC Press, Hanover 1999.