Stress state optimisation of vertical atmospheric large-volume tanks

Abstract

The strength calculation is very important in the design of the tank. Significant efforts have been made to solve this task and have led to standardized procedures, recommendations and standards for tank design. Within the existing standards, the designers are able to define mainly the geometry of the tank and technical conditions of the structure. When it is necessary to check the stability of the shell or the complete tank, they resort to analytical methods with the use of classical patterns from general theory of shells. As is well known, the application of general shell theory, even in the simplest of cases, leads to very complex calculations. When using membrane theory in the calculation, it is shown that satisfactory results are obtained only for parts of the shell far enough from ends, but it cannot satisfy all the conditions on the contour and the area of supports.

U projektovanju rezervoara proračun čvrstoće je veoma značajan. Značajniji napori uloženi u cilju rešavanja ovog zadatka doveli su do standardizovanih postupaka i do pre-poruka i standarda u oblasti projektovanja rezervoara. U okvirima postojećih standarda projektanti su u mogućnosti da definišu uglavnom geometriju rezervoara i tehničke uslo-ve izrade. Kada je potrebno proveriti stabilnost omotača ili kompletnog rezervoara, pribegavali su analitičkim metoda-ma uz korišćenje klasičnih obrazaca iz opšte teorije ljuski. Kako je poznato, primena opšte teorije ljuski, čak i u naj-jednostavnijim slučajevima, dovodi do vrlo složenih računa. Primena membranske teorije u proračunu pokazuje da se dobijaju zadovoljavajući rezultati samo za delove ljuske dovoljno udaljene od krajeva, ali ona ne može zadovoljiti sve uslove na konturi i u području oslonaca.