Simferopol', Simferopol, Russian Federation
The article presents a computational analysis of the modeling of a prefabricated reinforced concrete roof truss, taking into account the deterioration of the physico-mechanical properties of reinforced concrete: a decrease in the adhesion of reinforcement to concrete; a decrease in the modulus of elasticity and, as a result, the ability to resist deformation; a decrease in the strength and overall rigidity of the structure under fire as a result of fire. The stress-strain state of structures in the elastic formulation of problems under static load was studied Subject of research: numerical model of a precast reinforced concrete roof truss. Materials and methods: data for this article were obtained during the survey of precast reinforced concrete roof trusses. The LIRA-SAPR software package was used for the analysis. Results: as a result of the computational analysis, mosaics of nodal displacements of the calculated reinforcement for elements were obtained taking into account damage after fire exposure. Conclusions: the bearing capacity of the reinforced concrete roof truss was calculated taking into account damage and changes in the properties of concrete and reinforcement after fire exposure by using the LIRA-SAPR software package and the requirements of SP 468.1325800.2019, recommendations for the reinforcement were developed.
roof truss, survey, fire, LIRA-SAPR PC, finite element
1. Alekseenko V.N. Prochnost' zhelezobetonnyh balok pri deystvii poperechnyh sil posle pozhara : avtoreferat dis. ... kandidata tehnicheskih nauk : 05.23.01 / Nauchno-issled., proektno-konstruktorskiy i
2. GOST 17624-2021 Betony. Ul'trazvukovoy metod opredeleniya prochnosti [Tekst] / NIIZhB. - M.: Standartinform, 2021.
3. GOST 22904-2023. Konstrukcii zhelezobetonnye. Magnitnyy metod opredeleniya tolschiny zaschitnogo sloya betona i raspolozheniya armatury/NIIZhB Gosstroya SSSR. -M., 2023.
4. GOST 31937-2024. Zdaniya i sooruzheniya. Pravila obsledovaniya i monitoringa tehnicheskogo sostoyaniya [Tekst].- M.: Standartinform, 2024.
5. Zhukov V.V. Osnovy stoykosti betona pri deystvii povyshennyh; i vysokih temperatur. — Diss. na soiskanie uchenoy stepeni: dokt. tehn. nauk, M.,1981, 437 s.
6. Zalesov A.S. Sovershenstvovanie prakticheskih metodov rascheta prochnosti elementov zhelezobetonnyh konstrukciy pri sochetanii razlichnyh silovyh vozdeystviy [Tekst] : Avtoreferat dis. na soiskanie uchenoy
7. Makagonov V.A. Beton v usloviyah vysokotemperaturnogo nagreva. — M.: Stroyizdat, 1979, S. 15-42.
8. Milovanov A.F. Prochnost' betona pri nagreve. V kn.: Rabota zhelezobetonnyh konstrukciy pri vysokih temperaturah. M.: Stroyizdat 1972, S. 6-18.
9. Murashev V.I. Zamena metalla zhelezobetonom v agregatah i sooruzheniyah v usloviyah deystviya vysokoy temperatury. Stroitel'naya promyshlennost', 1943, №4-5, S.2-6.
10. Nekrasov K.D., Zhukov V.V., Shevchenko V.I. Issledovanie processov, okazyvayuschie vliyanie na razrushenie betona pri ego nagreve. V kn;: Trudy mezhdunarodnogo soveschaniya po prochnosti betona. — Drezden:
11. SP 20.13330.2016 «Nagruzki i vozdeystviya. Aktualizirovannaya redakciya SNiP 2.01.07 - 85*» [Tekst]. - M.: Minstroy Rossii, 2016. – 136 s.
12. SP 63.13330.2018 «Betonnye i zhelezobetonnye konstrukcii. Osnovnye polozheniya. Aktualizirovannaya redakciya SNiP 52-01-2003». [Tekst]. – M.: Minstroy Rossii, 2018. – 143 s.
13. SP 468.1325800.2019 Pravila obespecheniya ognestoykosti i ognesohrannosti betonnyh i zhelezobetonnyh konstrukciy].- M.: Standartinform, 2020.
14. Panyukov E.F. Ocenka sostoyaniya zhelezobetonnyh konstrukciy posle pozhara. Dis. d-ra tehn. nauk. M., 1991.-387 s.
15. Tamrazyan A.G., Baryak D.S. Sceplenie korrozionno-povrezhdennyh zhelezobetonnyh elementov pri ognevom vozdeystvii //Zhurnal «Stroitel'stvo i rekonstrukciya». 2025. Vyp. 1(117). S. 40–47 s.
16. Leonovich S.N., Litvinovskiy D.A. Analiticheskie zavicimosti prochnostnyh, deformativnyh, silovyh i energeticheskih parametrov vysokoprochnogo betona pri nagreve// Zhurnal Vestnik BNTU № 4, 2011). S.
17. Linchenko Yu.P. Sovmestnaya rabota armatury s betonom posle pozhara: avtoreferat dis. ... kandidata tehnicheskih nauk: 05.23.01 / N.-i. proektno-konstrukt. i tehn. in-t betona i zhelezobetona. — Moskva, 1989. —
18. Yakovlev A.I., Roytman V.M., Meshalkin E.A. Metod ocenki stoykosti stroitel'nyh konstrukciy k vzryvoobraznoy potere celostnosti v usloviyah pozhara. V kn.: Ognestoykosti stroitel'nyh konstrukciy: Trudy
