Strength and flexibility of vertical joints of panel buildings in shear and torsion

Under the action of horizontal wind and seismic loads, torsion occurs in asymmetric load-bearing systems of multi-storey buildings. The reason for torsion is the appearance of an eccentricity between the center of mass and the center of rigidity of the application of a horizontal load. Vertical loadbearing elements of panel buildings are connected into a spatial system by various shear bonds. The deformability of welded butt joints in a nonlinear formulation is based on experimental data on the action of shear forces. Considering that the deformability of a shear connection depends not only on the shear force, but is also a function of all forces and stresses along the height of a multi-story building, a complete deformation diagram of the shear connections under consideration is necessary. The influence of torsional action on the deformability of shear bonds has not been previously considered. This paper presents a finite element model realized in the ANSYS software package of a fragment of a panel building. The building fragment was determined under the condition of further experimental studies on the strength and deformability of the welded joint connecting two vertical load-bearing structures.

Numerical simulation determined the stress-strain state of a vertical dense joint of panel buildings under the action of shear and torsion. Step loading of the investigated fragment was carried out in the vertical and horizontal plane. The loading history adopted in the first approximation is the simplest – proportional. The bearing capacity and deformability of the joint under the action of shear and torsion are determined. Diagrams of the deformation of a dense joint are obtained. The ultimate load at which the joint becomes a hinge is determined. The torsional effect leads to an increase in the deformability of the dense bond. The results of the analysis can be used in the diagrammatic method of calculation of reinforced concrete structures of panel buildings subject to torsion.

1. Drozdov P.F. Design and Calculation of Load-bearing Systems of Multi-storey Buildingsand their Elements. Moscow: Stroyizdat, 1977. 223 p. (rus)

2. Gokdemir H., Ozbasaran H., Dogan M., Unluoglu E., Albayrak U. Effects of torsional irregularity to structures during earthquakes. Engineering Failure Analysis. 2013. Vol. 35. Pp. 713-717. https://doi.org/10.1016/j.engfailanal.2013.06.028

3. Burgan H.I. Numerical Modeling of Structural Irregularities on Unsymmetrical Buildings. Tehnički vjesnik. 2021. Vol. 28, 3. Pp. 856-861 https://doi.org/10.17559/TV-20200328103359

4. Botis M., Cerbu С.A. Method for Reducing of the Overall Torsion for Reinforced Concrete Multi-Storey Irregular Structures. Applied Sciences. 2020. No. 10. 5555. https://doi.org/10.3390/app10165555.

5. Hussein G., Eid N., Khaled Н. Torsional behavior of irregular structures during Earthquakes. Journal of Mechanical and Engineering. 2019. Vol. 16. I. 5. Ser. IV. Pp. 40-55. https://doi.org/10.9790/1684-1605044055.

6. TBEC 2018 Turkish Earthquake Code: Specifications for building design under earthquake effects. Ankara, Turkey.

7. EN 1998-1:2004 Eurocode 8: Design of structures for earthquake resistance – Part 1: General rules, seismic actions and rules for buildings. https://www.phd.eng.br/wp-content/uploads/2015/02/en.1998.1.2004.pdf

8. Uzbekistan Standards КМК 2.01.03-19 Construction in seismic regions. https://shank_uz/wpcontent/uploads/2021/07/shank_2.01.03-19

9. SP 14.13330.2018 Construction in seismic regions. https://docs.cntd.ru/document/550565571

10. Khatiwada P., Lumantarna E. Simplified Method of Determining Torsional Stability of the Multi-Storey Reinforced Concrete Buildings. Civil Engineering. 2021. No. 2. Pp. 290-308.

11. Dimova S.L., Alashki I. Seismic design of symmetric structures for accidental torsion. Bull. Earthquake Eng. 2003. No. 1. Pp. 303–320.

12. Manish 2, Syed Z.I. Seismic analysis of torsional irregularity in multi-storey symmetric and asymmetric buildings. Eurasian J. Anal. Chem. 2017. No. 13. Pp. 286–292.

13. Cando M.A., Hube M.A., Parra P.F., Arteta C.A. Effect of stiffness on the seismic performance of codeconforming reinforced concrete shear wall build. Engineering Structures. 2020. V. 219, 110724. https://doi.org/10.1016/j.engstruct.2020.110724.

14. Varma V., Kumar U. Seismic response on multi-storied building having shear walls with and without openings. Materials Today: Proceedings. 2021. Vol. 37. Part 2. Pp. 801-805. https://doi.org/10.1016/j.matpr.2020.05.827.

15. Naresh Kumar B.G., Punith N., Bhyrav R.B., Arpitha T.P. Assessment of location of centre of mass and centre of rigidity for different setback buildings. Int. J. Eng. Res. Technol. (IJERT). 2017. Vol. 6. Pp. 801-804.

16. Ankur J., Mitesh S. Floor displacement-based torsional amplification factors for seismic design of acceleration-sensitive non-structural components in torsionally irregular RC buildings. Vol. 254, 12022, 113871. https://doi.org/10.1016/jengstruct.2022.113871.

17. Perelmuter A.V., Kabantsev O.V. On conceptual provisions of design standards for earthquake resistant construction. Vestnik MGSU. 2020. No. 15 (12). Pp. 1673–1684. (rus)

18. Kolchunov V.I., Demyanov A.I., Protchenko M.V. Moments in reinforced concrete structures under bending with torsion. Building and Reconstruction. 2021. No. 3. Pp. 27-46. (rus) https://doi.org/10.33979/2073-74162021-95-3-27-46

19. Karpenko I, Kolchunov Vl., Kolchunov V., Travush1 V. Calculation model of a complex stressed reinforced concrete element under torsion with bending. International Journal for Computational Civil and Structural Engineering. 2021. No. 17(1). Pp. 34–47. https://doi.org/10.22337/2587-9618-2021-17-1-34-47.

20. Tamrazyan A.G. An assessment of the risk and reliability of load-bearing structures and key elements is a necessary condition for the safety of buildings and structures. Bulletin TSNIISK them. V.A. Kucherenko «Studies in the theory of structures». 2009. No. 1. Pp. 160-171. (rus)

21. Travush V.I., Kolchunov V.I., Klyueva N.V. Some directions of development of survivability theory of structural systems of buildings and structures. Promyshlennoe i grazhdanskoe stroitel 'stvo [Industrial and Civil Engineering]. 2015. No. 3. Pp. 4–11. (rus)

22. Lyublinskiy V., Struchkov V. Resistance of Vertical Joints During Torsion of Multistorey Buildings. In: Akimov P., Vatin N., Tusnin A., Doroshenko A. (eds) Proceedings of FORM. 2022. Lecture Notes in Civil Engineering, vol 282. Springer, Cham. (2022). https://doi.org/10.1007/978-3-031-10853-238.

23. Lyublinskiy V.A. On the torsion of asymmetric bearing systems of multi-storey buildings. Reinforced concrete structures. 2023. No. 1(1). Pp. 37-45. doi:10.22227/2949-1622.2023.1.37-45

24. Lyublinskiy V.A., Tomina M.V. Experimental study of the strength and suppleness of a vertical welded joint. System Technology Methods. 2018. No. 3(39). Pp. 154–158.

25. Lyublinskiy V.А. Tests of vertical welded butt joints of panel buildings. Building and Reconstruction. 2019. No. 5. Pp. 17-22. doi:10.33979/2073-7416-2019-85-5-17-22