Stress and Buckling Analysis of Cylindrical Steel Water Tanks under Seismic Loading

Year 2018, Volume: 1 Issue: 2, 55 - 66, 17.12.2018

Ali İhsan Çelik , Tahir Akgül , Ahmet Celal Apay , Adem Yurtsever

Abstract

The most common tanks are cylindrical steel liquid storage
tanks among the steel tanks used to store liquid. In studies conducted to
determine the type of damage that occurred in these tanks during the earthquake
and the factors that caused these damages, it was revealed that liquid storage
tanks performed poorly in earthquakes and requirement of new methods were
developed to increase earthquake resistance. Seismic analysis of tanks
containing liquid-structure interaction is a complex problem. At the basis of
the complexity is the fact that the tank has a thin wall, the multidynamic
responses of the axial and circumferential curves of the walls and the modes of
agitated liquid, the non-linear behavior of the liquid and vibrating wall it
contains and the buckling and deforming modes of the tank wall. One of the best
methods for examining the real behavior of tank-liquid interaction systems in a
short time is the finite element method. In this study, using the finite
element method (FEM), stresses occurring in cylindrical steel liquid tanks
under seismic loading and buckling due to these stresses are investigated.
Seismic analysis was carried out on three different wall thicknesses of 4mm,
6mm and 8mm for the top-open, conical-closed and dome-closed tanks, and it was
tried to determine the best tank lid transport to reduce equivalent stresses
and reduce buckling.

Keywords

Stress in cylindrical steel tanks, buckling of cylindrical steel tanks

Sismik Yükleme Altında Silindirik Çelik Su Tanklarının Gerilme ve Burkulma Analizi

Abstract

Sıvı depolamak amacıyla kullanılan çelik tanklar arasında
en yaygın olanı, silindirik çelik sıvı depolama tanklarıdır.  Deprem esnasında bu tanklarda oluşan hasar
tiplerini ve bu hasarlara neden olan etmenleri belirlemek amacıyla yapılan çalışmalarda,
sıvı depolama tanklarının depremlerde oldukça kötü performans gösterdikleri ve
deprem dayanımlarının arttırılması için yeni yöntemlerin geliştirilmesinin
gerekliliği ortaya çıkmıştır. Sıvı-yapı etkileşimini içeren tankların sismik
analizi karmaşık bir problemdir. Karmaşıklığın temelinde tankın ince bir cidara
sahip olması, cidarın eksenel ve çevresel esnemelerinin ve çalkalanan sıvının
modlarının çoklu dinamik tepkilerinin olması, içerdiği sıvının ve titreşen
cidarın doğrusal olmayan bir davranışa sahip olması ve tank cidarının burkulma
şekil değiştirme modalarına sahip olmasından kaynaklanmaktadır. Tank-sıvı etkileşim
sistemlerinin gerçek davranışlarının kısa sürede incelenmesi için en iyi
yöntemlerden biride sonlu elemanlar metodudur. Bu çalışmada, sonlu elemanlar
metodu (FEM) kullanılarak, sismik yükleme altındaki silindirik çelik sıvı
tanklarda meydana gelen gerilmeler ve bu gerilmelere bağlı olarak meydana gelen
burkulmalar incelenmektedir. Üstü-açık, konik-kapalı ve kubbe şeklinde
kapatılmış tanklar için 4mm, 6mm ve 8mm’lik üç farklı cidar kalınlıklarında
yapılan sismik analiz sonucunda, eşdeğer gerilmelerin düşürülmesi ve burkulmaların
azaltılması için en iyi tank kapak tasımı belirlenmeye çalışılmıştır.

Keywords

Silindirik çelik tanklarda gerilme

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