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Abstrak :
Baja karbon rendah ASTM A36 umum digunakan pada aplikasi konstruksi, perminyakan, dan struktur kapal. Ketiga aplikasi tersebut memungkinkan adanya tegangan tarik pada saat pemasangan maupun penggunaan. Perilaku korosi baja ASTM A36 dengan fungsi tegangan tarik diamati menggunakan metode Electrochemical Impedance Spectroscopy (EIS) dan X-Ray Diffractometer (XRD). Baja ASTM A36 dilakukan perendaman pada larutan NaCl 3,5% dengan variasi tegangan tarik 0, 100, dan 200 MPa dan variasi waktu perendaman 1 jam, 4 jam, 8 jam, 24 jam, dan 72 jam. Hasilnya menunjukkan bahwa semakin besar tegangan tarik dapat menurunkan ketahanan baja terhadap korosi. Semakin besar tegangan, resistansi logam terhadap serangan korosi semakin menurun serta memungkinkan terbentuknya lubang korosi sumuran yang lebih besar akibat adanya tegangan pada batas butir yang terkorosi. Hasil analisa XRD pada permukaan baja setelah proses korosi menunjukkan adanya fasa berupa Fe, magnetit (Fe₃O₄), dan NaCl...... ASTM A36 low carbon steel is commonly used in construction, petroleum, and ship structure applications. These three applications allow for tensile stress during installation and use. The corrosion behavior of ASTM A36 steel with tensile stress function was observed using Electrochemical Impedance Spectroscopy (EIS) and X-Ray Diffractometer (XRD) methods. ASTM A36 steel was immersed in 3.5% NaCl solution with variations in tensile stress of 0, 100, and 200 MPa and immersion time variations of 1 hour, 4 hours, 8 hours, 24 hours, and 72 hours. The results show that the greater the tensile stress, the lower the steel's resistance to corrosion. The greater the stress, the lower the metal's resistance to corrosion attack and allows the formation of larger pits due to stress at the corroded grain boundaries. The results of XRD analysis on the ASTM A36 low carbon steel surface after the corrosion process showed the presence of Fe, magnetite (Fe₃O₄), and NaCl phases.

Abstrak :
ABSTRAK
Tangki silinder beton prategang merupakan pilihan yang terbaik dalam desain tangki saat ini. Tekanan hidrostatis mengakibatkan terjadinya beban aksisimetris pada dinding sehingga desain klasik memerlukan analisis dengan teori cangkang silindris. Dari hasil penelitian dengan memperhitungkan tekanan hidrodinamik terhadap rasio tinggi dengan diameter tangki melalui permodelan dengan menggunakan SAP2000 disimpulkan bahwa rasio 1 : 4 merupakan rasio yang paling ekonomis. Hubungan dinding dan dasar dinding yang dapat bergerak bebas (free sliding) juga menunjukkan perilaku yang paling optimal dibandingkan perletakan lainnya untuk dimensi tangki yang besar. Disamping itu, penggunaan prategang arah melingkar dan vertikal memperkecil kemungkinan terjadinya retak akibat tegangan tarik saat tangki penuh maupun kosong.

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ABSTRACT
Cylindrical Prestressed Concrete is the best choice of tank design these days. Hydrostatic pressure implies on axissymetrical loading on the tank wall that cylindrical shell analysis should be done for classical design. Considering the hydrodynamic pressure and using SAP2000, this research concludes that the most economical ratio height-diameter of tank is 1 : 4. Free sliding wall base also shows the most optimum behaviour among other base supports on large dimension. At the other side, circular and vertical prestressing decreases the probability of crack due to tension stress when the tank in full or empty condition.;Cylindrical Prestressed Concrete is the best choice of tank design these days. Hydrostatic pressure implies on axissymetrical loading on the tank wall that cylindrical shell analysis should be done for classical design. Considering the hydrodynamic pressure and using SAP2000, this research concludes that the most economical ratio height-diameter of tank is 1 : 4. Free sliding wall base also shows the most optimum behaviour among other base supports on large dimension. At the other side, circular and vertical prestressing decreases the probability of crack due to tension stress when the tank in full or empty condition.