اثرپديده خوردگي روي مقاومت كمانشي مخازن استوانه اي رو زميني تحت تاثيربارلرزه اي

The effect of corrosion on the buckling strength of the earthquake cylindrical tanks under the impact of a shock wave

درتمام شاخه هاي صنعت به ويژه درصنعت نفت،سازه هاي فلزي جدارنازك به طورگسترده مورداستفاده قرارمي گيرد.مخازن استوانه اي نمونه اي ازچنين سازه هايي هستند،كه درروندساخت وسازوهمچنين درطول مدت زماني كه ازعمرچنين سازه هايي مي گذردمعمولانقايصي به وجودآمده كه آن هاراازفرم ايده آل خارج مي كند.خوردگي فولادنيزيكي ازاين نقايص هندسي مي باشدكه ازمهم ترين عوامل گسيختگي مخازن به شمارمي آيد.به همين علت ارزيابي اين گونه سازه هابااستفاده ازمدل هاي تحليلي امري ضروري است. هدف اصلي اين مطالعه بررسي اثرغيريكنواختي ضخامت ناشي ازخوردگي ديواره مخزن روي مقاومت كمانشي مخازن استوانه اي مهارشده تحت اثربارلرزه اي مي باشد.ازنرم افزارالمان محدودAbaqusجهت مدل سازي سيال وسازه استفاده شده است.ازالمان پوسته(shell)به منظورمدل سازي ديواره وهمچنين از المان آكوستيك(AC3D8R)براي مدل سازي سيال استفاده شد.سازه هاي مورداستفاده دراين مطالعه،مخازني بانسبت ارتفاع به قطرهاي0.4و0.95مي باشند

In all branches of the industry, especially in the oil industry, metal structures are widely used Cylindrical. cylinders are an example of such structures, which, during construction and during construction, during the time when structures are being constructed, there is still a tendency to exhaust the ideal structure. Steel corrosion of these geometric defects is one of the most important factors in the failure of the tanks. Therefore, the evaluation of such structures requires the use of analytical models. The main objective of this study was to investigate the effect of non-uniformity of the thickness of the reservoir wall on the buckling strength of the cylindrical reservoirs under fire impact. The Abaqus limited finite element was used for fluid modeling. The shell was designed to model the wall as well as the acoustic element (AC3D8R ) Were used for fluid modeling. The properties used in this study are tanks with a height of 0.4 and 0.95 in diameter.