Design of floor slabs in monolithic frames with composite reinforcement for service loads and resistance to progressive collapse

Introduction. At the moment, the use of fibre-reinforced polymer (FRP) reinforcement in load-bearing structures of buildings is mainly reduced to foundations. This is due to the physical and mechanical properties of fibre-reinforced polymer. To expand the field of application of composite reinforcement, it is proposed to use it as an upper reinforcement of slabs of monolithic concrete frames. The frame is designed to be resistant to progressive collapse.

Materials and methods. The object of the numerical study is a 10-storey building with a frame-wall structural system. For comparison, two options for reinforcing floor slabs were considered — bar mat in the lower and upper zones: 1 — lower and upper reinforcement from reinforcing bars of class A500 of National State Standard 34028–2016; 2 — lower reinforcement made of reinforcing bars of class A500, upper reinforcement made of glass fibre-reinforced polymer (GFRP) of National State Standard 31938–2022. Calculations were performed for the main combination of loads and for resistance to progressive collapse. The software package LIRA version 10.12 was used. As a result of the calculations, the required reinforcement areas of the first-floor slab were determined.

Results. The required reinforcement area of the GFRP when calculated for resistance to progressive collapse in a quasi-static formulation, with a dynamic factor of Kdyn = 1.444, exceeded the area when calculated for the main combination of loads by 7.46 %. The required area of the upper reinforcement of the ASK, calculated for the main combination of loads, exceeded the area of the A500 steel reinforcement by 39.35 %. When calculating for progressive collapse, the difference decreased to 17.68 and 15.32 %, respectively, for calculations in a quasi-static formulation with the values of the dynamic factors Kdyn = 1.444 and Kdyn = 2.

Conclusions. The proposed combined reinforcement of floor slabs, taking into account the calculations for resistance to progressive collapse, allows for more efficient use of FRP reinforcement.

1. Baša N., Vuković N.K., Ulićević M., Muhadinović M. Effects of internal force redistribution on the limit states of continuous beams with GFRP reinforcement. Applied Sciences. 2020; 10(11):3973. DOI: 10.3390/app10113973. EDN NUSXIC

2. Ju M., Park Y., Park C. Cracking control comparison in the specifications of serviceability in cracking for FRP reinforced concrete beams. Composite Structures. 2017; 182:674-684. DOI: 10.1016/j.compstruct.2017.09.016

3. Fabrichnaya K.A. Strength assessment of complex intersections made of expanded clay concrete blocks. Bulletin of Civil Engineers. 2023; 6(101):31-42. DOI: 10.23968/1999-5571-2023-20-6-31-42. EDN BIMNIY. (rus.).

4. Antakov I.A. Features of behavior of flexural members with composite polymeric reinforcement under load. Housing Construction. 2018; 5:15-18. EDN XQKXFB. (rus.).

5. Mirsayapov I.T., Lim V.A., Mirsayapov A.I., Suleymanov A.M. Evaluation of the effectiveness of the use of high-modulus polymer composite reinforcement. News of the Kazan State University of Architecture and Engineering. 2023; 3(65):145-153. DOI: 10.52409/20731523_2023_3_145. EDN KGTHOV. (rus.).

6. Mukhamediev T.A., Zenin S.A., Kudyakov K.L. Research of strength of unaxial compressed concrete elements reinforced with FRP. Concrete and Reinforced Concrete. 2024; 2(621):13-19. DOI: 10.37538/0005-9889-2024-2(621)-13-19. EDN GRWDHG. (rus.).

7. Merkulov S.I., Rimshin V.I., Akimov E.K. Fire resistance of concrete structures with composite rod reinforcement. Industrial and Civil Engineering. 2019; 4:50-55. DOI: 10.33622/0869-7019.2019.04.50-55. EDN BYRGVY. (rus.).

8. Zinnurov T.A., Kormiltsev V.S. Theoretical studies of the effect of temperature action on the operation of various types of reinforcement in concrete structures. Roads and Transport Infrastructure. 2023; 4(4):5-13. EDN LGNGAZ. (rus.).

9. Mukhamediev T.A., Kuzevanov D.V. On the calculation of the strength of bent structures made of concrete with composite reinforcement. Structural Mechanics and Analysis of Constructions. 2016; 4(267):18-22. EDN WHMCOH. (rus.).

10. Kudyakov K.L., Buchkin A.V. Design of monolithic concrete foundation slabs with FRP reinforcement. Vestnik MGSU [Monthly Journal on Construction and Architecture]. 2024; 19(6):892-905. DOI: 10.22227/1997-0935.2024.6.892-905. EDN KIIJJC. (rus.).

11. Mirsayapov I.T., Antakov I.A., Antakov A.B. The analysis of crack width in flexural concrete members reinforced with polymer composite bars. Vestnik MGSU [Monthly Journal on Construction and Architecture]. 2020; 15(12):1663-1672. DOI: 10.22227/1997-0935.2020.12.1663-1672. EDN XABHJC. (rus.).

12. Kolchunov V.I., Fedorova N.V., Savin S.Yu., Amelina M.A. Stability of eccentrically compressed reinforced concrete elements in an accidental design situation. Construction, Buildings and Structures. 2024; 4(9):4-21. EDN IYDOIR. (rus.).

13. Mironova Ju.V., Suleymanov A.M. Constructive solution of the joint of columns with the floor slab in a prefabricated-monolithic frame to increase resistance to progressive collapse. News of the Kazan State University of Architecture and Engineering. 2023; 3(65):135-144. DOI: 10.52409/20731523_2023_3_135. EDN JNOUXR.(rus.).

14. Mironova Ju.V., Lyublinskiy V.A., Malongo J.M., Kharitonov I.F. Stress-strain state of the loop joint of a large-panel building with progressive collapse. News of the Kazan State University of Architecture and Engineering. 2024; 4(70):72-82. DOI: 10.48612/News-KSUAE/70.7. EDN ECSCSH. (rus.).

15. Elkady N., Augusthus Nelson L., Weekes L., Makoond N., Buitrago M. Progressive collapse: Past, present, future and beyond. Structures. 2024; 62:106131. DOI: 10.1016/j.istruc.2024.106131. EDN FYLRWY.

16. Kiakojouri F., De Biagi V., Chiaia B., Sheidaii M.R. Strengthening and retrofitting techniques to mitigate progressive collapse: A critical review and future research agenda. Engineering Structures. 2022; 262:114274. DOI: 10.1016/j.engstruct.2022.114274. EDN NAXIZX.

17. Makoond N., Shahnazi G., Buitrago M., Adam J.M. Corner-column failure scenarios in building structures: Current knowledge and future prospects. Structures. 2023; 49:958-982. DOI: 10.1016/j.istruc.2023.01.121. EDN QFSPDN.

18. Alshaikh I.M.H., Bakar B.H.A., Alwesabi E.A.H., Akil H.Md. Experimental investigation of the progressive collapse of reinforced concrete structures : аn overview. Structures. 2020; 25:881-900. DOI: 10.1016/j.istruc.2020.03.018. EDN YLAATO.

19. Adam J.M., Parisi F., Sagaseta J., Lu X. Research and practice on progressive collapse and robustness of building structures in the 21st century. Engineering Structures. 2018; 173:122-149. DOI: 10.1016/j.engstruct.2018.06.082

20. Mironova Yu.V., Denisov V.V. Stress-strain state of precast reinforced concrete frame with progressive collapse. Construction, buildings and structures. 2022; 1(1):4-12. EDN BLYYSL. (rus.).

21. Semashkin A.D., Tusnin A.R., Berger M.P. Methods of structural analysis for resistance to progressive collapse. Construction: Science and Education. 2023; 13(2):31-50. DOI: 10.22227/2305-5502.2023.2.3. EDN SSKMDG. (rus.).

22. Kiakojouri F., Zeinali E., Adam J.M., De Biagi V. Experimental studies on the progressive collapse of building structures: A review and discussion on dynamic column removal techniques. Structures. 2023; 57:105059. DOI: 10.1016/j.istruc.2023.105059. EDN DEYPZM.

23. Perelmuter A.V., Kabantsev O.V. About the Problem of Analysis Resistance Bearing Systems in Failure of a Structural Element. International Journal for Computational Civil and Structural Engineering. 2018; 14(3):103-113. DOI: 10.22337/2587-9618-2018-14-3-103-113. EDN CKYYJV.