تاثیر پارامترهای مختلف زلزله بر رفتار دینامیکی اسکله

نوع مقاله : پژوهشی اصیل (کامل)

نویسندگان
1 دانشگاه آزاد اسلامی
2 استادیار گروه ژئوتکنیک، دانشگاه آزاد اسلامی
3 استادیار، دانشگاه آزاد اسلامی
4 استادیار دانشگاه،دانشگاه آزاد اسلامی
چکیده
اسکله یک سازه مهندسی است که عموما برای بارگیری و باراندازی کالاها ساخته می­شوند. این سازه با توجه به شرایط کنار سواحل ممکن است بر روی لایه های ضعیف همانند شن و ماسه اجرا شود. در صورت طراحی نادرست این سازه و ایجاد گسیختگی در آن، فعالیتهای اسکله به دلیل آسیب وارده به تاسیسات مجاور آن ممکن است برای مدتها متوقف شود. به همین دلیل بررسی نحوه رفتار سازه­های ساحلی در برابر عوامل گسیختگی همچون زلزله و روانگرایی ناشی از آن اهمیت بالایی دارد. تحلیل عملکرد اسکله در برابر روانگرایی معمولا توسط روشهای عددی انجام می­شود. در این مقاله با استفاده از نرم­افزار Flac2D که دارای قابلیت تحلیل غیرخطی تنش مؤثر و تولید اضافه فشار آب حفره­ای در محیط پیوسته خاک است، به شبیه­سازی روانگرایی در خاک اطراف اسکله با کمک مدل رفتاری Finn پرداخته شده است. در ادامه تاثیر پارامترهای مختلف زلزله بر روی رفتار اسکله بررسی شده است. در نهایت نتایج اضافه فشار آب حفره­ای، جابه جایی­ افقی و نشست خاک و لنگر خمشی شمعها ارائه شده است. سپس میزان همبستگی این پارامترها با پارامترهای مختلف زلزله بررسی شده است. از آنجایی که معیارهای شدت زلزله اهمیت زیادی در ارزیابی احتمالاتی تقاضای لرزه­ای انواع سازه­ها دارند. بنابراین در این مطالعه به منظور بررسی کیفیت معیارهای شدت زلزله، شاخصهای تعیین کننده­ای نظیر بهینه و کاربردی بودن، شاخص کارآیی، کفایت نسبت به بزرگای زلزله و فاصله از مرکز انتشار زلزله بررسی شده است. نتایج نشان می­دهد تطابق بین پارامترهای زلزله با نشست خاک نسبت به پارامترهای دیگر عموما بهتر می­باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله English

The Effect of Different Earthquake Parameters on the Dynamic Behavior of the Wharf

نویسندگان English

A. abdollahzadeh 1
N. hadiani 2
A. Eghbali 3
M. haghbin 4
1 student
2 assistant professor
3 assistant professor
4 Assistant Professor
چکیده English

Abstract



Wharf is an engineering structure which is constructed generally for loading or unloading of goods. The structure may be constructed on the weak layers like gravel and sand with respect to the bank conditions. In case of incorrect design of this type of structure and its failure, the wharf activities may be stopped for a long time due to damage to adjacent facilities. For this reason, investigating the behavior of coastal structures against failure factors such as earthquake and the liquefaction due to it, is of great importance. Analysis of wharf performance against liquefaction is done generally using the numerical methods. In this article using the Flac2D software which has the capability of nonlinear analysis of effective stress and generation of excess pore water pressure in the soil continuum, the liquefaction phenomenon in the soil surrounding the wharf is simulated using the behavioral model Finn. In continuation, the impact of different earthquake parameters on the wharf behavior is investigated. Finally, the results of the excess pore water pressure, horizontal displacement, soil settlement and bending moment of piles are presented. Then, the correlation between these parameters and different earthquake parameters is investigated. As the earthquake intensity criteria have great importance in terms of statistical assessment of seismic demand of various types of structures, therefore, in this study in order to investigate the quality of earthquake intensity criteria, the determining indices such as being optimal and applicable, efficiency index, sufficiency with respect to the earthquake magnitude and distance to the center of earthquake propagation are investigated. The results show that compatibility between the earthquake parameters and soil settlement is generally better with respect to other parameters.



Keywords: Wharf, liquefaction, dynamic analysis, finite difference method.

کلیدواژه‌ها English

wharf
liquifaction
Dynamic Analysis
finite difference method
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