Purpose: To show the features of the calculation of constructions in opposition to the effect of weak frequent earthquakes. Methods: Numerical modeling of seismic vibrations of constructions. Analysis of limit states. Results: The specificities of construction calculation for impact of weak earthquakes are analyzed. Earthquakes of 1 per 30 and per 50 years repeatability are considered. In the first case, after an earthquake a construction should operate standardly, without damage. In the second case, damages, that does not affect construction exploitation, are accepted. Main attention is paid on the three issues: setting of elastic and damping characteristics of ferroconcrete, formalization of limit states, load combinations. The dependence of a damping from ferroconcrete reinforcement degree is estimated. When evaluating limit states, besides calculations on crack resistance and strength, the possibility to exclude people panic is considered. To make so, it’s proposed to limit speed level in certain octave ranges. Proposals are developed for estimation of coefficients for combinations of various loads with seismic ones. The coefficients for combinations of seismic and ice loads are evaluated. Practical importance: A system of calculating coefficients has been established to assess seismic resistance under relatively weak, frequent impacts. It’s been shown that for strong impacts, the combination coefficients for different regions turn out to be close to each other, while for weak impacts, they can differ drastically.
weak earthquakes, frequent earthquakes, limit state, reinforcement coefficient, crack resistance, strength, load combination coefficient
1. Dolcea Mauro, Kappos Andreas, Masia Angelo, Penelisb Gregory, Vona Marco. Vulnerability assessment and earthquake damage scenarios of the building stock of Potenza (Southern Italy) using Italian and Greek methodologies. Engineering Structures, Engineering Structures 28 (2006) pp. 357-371.
2. Le norme tecniche per le costruzioni. Il ministero delle infrastrutture e dei trasporti. 2018.
3. GOST 12.1.003-83 Sistema standartov bezopasnosti truda (SSBT). Shum. Obschie trebovaniya bezopasnosti (s Izmeneniem N 1)
4. Nesterova O.P., Nikonova N.V., Fedorova M.Yu., Uzdin A.M., Vorobyova K.V. Taking account of damping in estimating structure earthquake stability. Materials Physics and Mechanics 26 (2016) p.57-60
5. Rukovodstvo po proektirovaniyu fundamentov mashin s dinamicheskimi nagruzkami. Stroyizdat, Moskva, 1982. S. 207.
6. Il'ichev V.A., Mongolov Yu.V., Shaevich V.M. Svaynye fundamenty v seysmicheskih rayonah. V: Stroyizdat, Moskva, 144 s.
7. Aptikaev F.F. Instrumental'naya shkala seysmicheskoy intensivnosti. - M.: OOO «Nauka i obrazovanie», 2012. - 176 s.
8. Areschenko T.S., Prokopovich S.V., Sabirova O.B., Frolova E.D. «Zadanie urovnya seysmicheskogo vozdeystviya dlya ocenki seysmostoykosti sooruzheniy pri mnogourovnevom proektirovanii» Prirodnye i tehnogennye riski. Bezopasnost' sooruzheniy. 2018, №4, s.25-27
9. Areschenko T.S., Prokopovich S.V., Sabirova O.B., Frolova E.D., Uzdin A.M. Programma opredeleniya pikovyh uskoreniy seysmicheskogo vozdeystviya. Svidetel'stvo o gosudarstvennoy registracii programmy dlya EVM №2018664350. Avtory: Uzdin A.M., Prokopovich S.V., Areschenko T.S., Frolova E.D., Sabirova O.B. Zaregistrirovana 14 noyabrya 2018 g.
10. Seysmicheskaya sotryasaemost' territorii SSSR. // Pod red. Yu.V.Riznichenko. M., Nauka, 1979, 192 s
11. Nazarova Sh.Sh., Uzdin A.M. Setting peak ground accelerations for performance-based design of earthquake-resistant constructions. Seismic instruments. Vol. 56, №2, 2020, pp 225-236
12. Uzdin A.M., Cibarova M.Yu. Vliyanie dempfirovaniya na velichinu koefficienta dinamichnosti. Ekspress-informaciya "Seysmostoykoe stroitel'stvo",1985 Vyp.11, s.27-30
13. Uzdin A.M., Kuznecova I.O. Seysmostoykost' mostov. Saarbryuken (Germaniya), Palmarium, 2014, 450 s
14. Saharov O.A. Analiz seysmostoykosti metallicheskoy bashni «Ramboll» sistemy sotovoy telefonnoy svyazi. Seysmostoykoe stroitel'stvo. Bezopasnost' sooruzheniy, 2005, №2, s 10-14
15. Yin, Y.J., Li, Y., Bulleit, W.M., 2008. SNOW AND EARTHQUAKE LOAD COMBINATION CONSIDERING SNOW ACCUMULATION, the 14 th World Conference on Earthquake Engineering, October 12-17, 2008, Beijing, China.
16. Sabirova O.B. Raspredelenie pikovyh uskoreniy zemletryaseniya dlya ploschadki stroitel'stva. Voprosy inzhenernoy seysmologii. 2021, 48, № 1 s. 5-14, https://doi.org/10.21455/VIS2021.1-1
17. Rayzer V.D. Metody teorii nadezhnosti v zadachah normirovaniya raschetnyh parametrov stroitel'nyh konstrukciy. M., Stroyizdat, 1986, 193 s.
18. Tuomo Poutanen, Jari Mäkinen, Sampsa Pursiainen, Tim Länsivaara, 2018. Load combination of permanent and variable loads. Rakenteiden Mekaniikka (Journal of Structural Mechanics) Vol. 51, No 1, 1-9.
19. Sakharov, O.A., 2003. On the issue of assigning coefficients for combinations of seismic and other loads. Earthquake-resistant construction, No. 2, 9-11.
20. Sabirova O.B. Ocenka koefficientov sochetaniy seysmicheskoy i ledovoy nagruzok. Seysmostoykoe stroitel'stvo. Bezopasnost' sooruzheniy. №1 2019, s. 28-32
21. Dolgaya A.A. Modelirovanie seysmicheskogo vozdeystviya korotkim vremennym processom. // E-I. VNIINTPI. Ser. “Seysmostoykoe stroitel'stvo”, Vyp. 5-6., 1994, s.56-63
