Methods of experimental and numerical studies of reinforced concrete frames of multi-storey buildings under special influences

The method of experimental and numerical studies of reinforced concrete frame structures with crossbars reinforced with inclined rods under special influences is given. The main objective of these studies was to determine the nature of deformation, cracking and destruction of such structures under special impact caused by the sudden removal of one of the structures and, as a consequence, the redistribution of force flows in them. To increase the survivability and protection of the studied structural system from progressive collapse, with a quantitative and qualitative change in the forces in its elements, it is proposed to install transverse reinforcement from inclined reinforcing rods in two mutually perpendicular directions on the supporting sections of the frame system crossbars. The parameters of such reinforcement and the parameters embedded in the design model of the frame structure under consideration for static loading at the first stage and dynamic loading at the second stage are determined by numerical modeling using the Ansys software package. On this basis, the justification of the adopted design decisions of frame structures for the development of a program for conducting experimental studies of such structures under special influences was carried out.

1. Almazov V.O., Kao Zui Khoi. Dynamics of progressive destruction of monolithic multi-storey frames. Moscow: DIA, 2013. 128 p.

2. Fialkoa S.Yu., Kabantsevb O.V., Perelmuter A.V. Elasto-plastic progressive collapse analysis based on the integration of the equations of motion // Magazine of Civil Engineering. 2021. 102(2). Article No. 10214

3. Kodysh E.N. Protection of multi-storey buildings from progressive collapse / Kodysh E.N., Trekin N.N., Chesnokov D.A. // Industrial and civil construction. 2016. No. 6. P. 8-13.

4. Fedorova N.V., Fan Dinh Guok, Nguyen Thi Chang. Experimental studies of the survivability of reinforced concrete frames with crossbars reinforced with indirect reinforcement // Construction and reconstruction. 2020. No. 1. Pp. 92-100.

5. Ilyushchenko T.A., Kolchunov V.I., Fedorov S.S. Crack resistance of prestressed reinforced concrete framerod structures under special influences. Construction and reconstruction. 2021. No (1). 74-84

6. Fedorova N. In. Methods of experimental studies of the deformation of monolithic reinforced concrete frame of a building during emergency effects / Fedorova N. In., Koren'kov, P. A., Wu N. T. // Construction and reconstruction of the 2018. Vol. 4. No. 78. Pp. 42–52.

7. Kodish E.N. The protection design of buildings and structures against progressive collapse, given the emergence of limit state // Industrial and civil construction. 2018. No. 10. Pp. 95-101.

8. Kolcunov V.I. Deformation and failure of a monolithic reinforced concrete frame under accidental actions / Kolcunov V.I., Tuyen N.V., Korenkov P.A. // IOP Conference Series: Materials Science and Engineering. 2020. T. 753. S. 032037.

9. Fedorova N.V. Deformation and failure of monolithic reinforced concrete frames under special actions / Fedorova N.V., Ngoc T.V. // Journal of Physics: Conference Series. 2019. T. 1425. P. 012033.

10. Adam J. M. Research and practice on progressive collapse and robustness of building structures in the 21st century / Adam J. M., Parisi F., Sagaseta, J., Lu X. // Engineering Structures. 2018. Vol. 173. S. 122–149.

11. Yu J. Experimental and numerical investigation on progressive collapse resistance of reinforced concrete beam column sub-assemblages / Yu J., Tan K. H. // Engineering Structures. 2013. T. 55. Pp. 90–106.

12. Deng X.-F., Liang S.-L., Fu F., Qian K. Effects of high-strength concrete on progressive collapse resistance of reinforced concrete frame // Journal of Structural Engineering. 2020. Vol. 146. Issue 6. P. 04020078. DOI: 10.1061/(asce)st.1943-541x.0002628

13. Xuan W., Wang L., Liu C., Xing G., Zhang L., Chen H. Experimental and theoretical investigations on progressive collapse resistance of the concrete-filled square steel tubular column and steel beam frame under the middle column failure scenario // Shock and Vibration. 2019. Vol. 2019. Pp. 1–12. DOI: 10.1155/2019/2354931

14. Alogla K. Theoretical assessment of progressive collapse capacity of reinforced concrete structures / Alogla K., Weekes L., Augusthus-Nelson L. // Magazine of Concrete Research. 2017. Vol. 69. No. 3. Pp. 145-162.

15. Shan S. et al. Experimental study on the progressive collapse performance of RC frames with infill walls // Eng. Struct. 2016. Vol. 111. Pp. 80–92.

16. Wu Ngoc Tuen Study of the survivability of a structurally nonlinear reinforced concrete frame-rod system of a multi-storey building frame in a dynamic formulation / Vu Ngoc Tuen // Construction and reconstruction. 2020.- Vol. 90. No. 4. Pр. 73-84.

17. Fedorova N.V., Khalina T.A. Investigation of dynamic reloading in reinforced concrete structural systems during sudden structural rearrangements // Industrial and civil construction. 2017. No. 8. Рp. 32-36.

18. Bondarenko V.M. Computational models of the force resistance of reinforced concrete / V.M. Bondarenko, V.I. Kolchunov. M.: DIA, 2004. 472 p.

19. Bondarenko V.M., Klyueva N. V. On the calculation of structures that change the design scheme as a result of corrosion changes // Izvestiya vuzov. 2008. No. 1. P. 4-12.

20. SP 385. 1325800.2018 Protection of buildings and structures from progressive collapse.

21. SP 63.13330.2018 Concrete and reinforced concrete structures. The main provisions. SNiP 52-01-2003 (with Change N 1). Official publication. Moscow: Standartinform, 2019.

22. Geniev G.A. On the evaluation of dynamic effects in rod systems made of brittle materials// Concrete and reinforced concrete. 1992. No. 9. Pp..25-27.

23. Shapiro G.I. Some calculation issues in the coupling of prefabricated structures// Construction and reconstruction. 2022. No.1. Pp.54-58

24.