13891

12627

كارشناسي ارشد

آب و سازه هاي هيدروليكي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده عمران

۱۳۹۷

دوازده، ۲۳۰ص.: مصور، جدول، نمودار

فرهاد بهنام فر

عبدالرضا كبيري ساماني

بيژن برومند، محمد علي گودرزي

1397/07/04

كتابنامه

عمران

مهندسي عمران

ID12627

Dynamic Response of Cylindrical Water Storage Tanks Made by ECC Compared to Normal Concrete Pouria Sheikhbahaei p sheikhbahaee@cv iut ac ir Date of Submission June 27 2018 Department of Civil Engineering Isfahan University of Technology Isfahan Iran Degree M Sc Language Farsi Supervisor Dr Farhad Behnamfar farhad@cc iut ac ir AbstractOne of the important structures used in residential water supply systems and industrial installations is waterstorage tank Also water storage tanks are used for supplying water in a region stricken by an earthquake Seismicdamages of these tanks can cause financial and vital injuries Therefore it is important to evaluate the dynamicbehaviour of tanks and use effective methods to reduce the seismic vulnerability In spite of numerous researchesdone damages observed in the water storage tanks in recent earthquakes indicate the inadequacy of ordinarymethods of construction of this type of reservoirs so changing the materials and the designing methods of thiskind of structures are important Also The assumption of the linear behaviour of concrete in existing design codescauses seismic vulnerability of the reservoirs Considering the effect of cracking and crushing of concrete innonlinear analysis leads to the exact evaluation of the dynamic behaviour of the storage tanks It can reduce theseismic vulnerability of this type of structures In this study ANSYS software is used for nonlinear analysis ofreservoirs In order to evaluate the ability of this software in nonlinear analysis of reinforced concrete structuresunder cyclic loadings the hysteresis diagram of a reinforced concrete beam was extracted and the results werecompared with a laboratory work In this research 10 cylindrical tanks with different height and diameters havebeen selected and are designed based on ACI standard The results obtained in ANSYS software indicate that theterms exist in ACI standard are inadequate which cause the vulnerability of the reservoirs during an earthquake In this study the role of using ECC in reducing the damages of reservoirs is investigated Special characteristicsof ECC include high tensile strength tensile strain capacity about 300 times the ordinary concrete and acceptabledurability in different environmental conditions One of the factors that causes the damages of the reservoirs inrecent earthquakes is the low tensile strength of concrete which causes cracking and can lead to wall rupture fluid leakage from the wall and corrosion of reinforcements According to the results obtained in this study usingECC leads to the increment of the tensile capacity of the wall which is the most important achievement of thepresent study Also one of the conventional methods for improving the dynamic performance of the reservoirs isthe reduction of the bending moment of the wall Due to the reduction of wall thickness in thanks modelled withECC reduction of the bending moment per unit width of the wall is an important achievement According to theresults obtained In tanks modelled with ECC the concrete fracture was not observed and cracks had very smallwidths which is not problematic Key WordsConcrete Tanks Dynamic Analysis Nonlinear Analysis Hysteresis ANSYS

فرهاد بهنام فر

عبدالرضا كبيري ساماني

بيژن برومند، محمد علي گودرزي