تشخیص خسارت در پلهای بزرگ دهانه با وجود چند خسارت همزمان
الموضوعات : آنالیز سازه - زلزلهمحمد وحیدی 1 , آرمین عطیمی نژاد 2 , مریم فیروزی 3 , محمد هریسچیان 4
1 - گروه مهندسی عمران، واحد تهران جنوب، دانشگاه آزاد اسالمی، تهران، ایران
2 - دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران، ایران
3 - هیات علمی دانشگاه آزاد اسلامی واحد تهران جنوب
4 - department of civil eng, islamic Azad Uni (south Tehran branch)
الکلمات المفتاحية: تشخیص خسارتچندگانه , خسارات ریز و کوچک, المان محدود طیفی, شاخص خسارت انرژیکرنشی مودال, رگرسیون بردار پشتیبان, الگوریتم ژنتیک,
ملخص المقالة :
مقاله حاضر یک روش دومرحلهای قدرتمند برای تشخیص خسارت پلهای بزرگ دهانه با مقاطع متغیر ارائه مینماید. پلها یکی از زیرساختهای اساسی در حوزه حملونقل شهری و برون شهری بوده که تشخیص خسارت به موقع درطول بهرهبرداری آن حائز اهمیت میباشد. خسارت دراین دسته از سازهها سبب اختلال درخدمترسانی درزمان بروزبلایای طبیعیخواهد شد. روش ارائه شده بر مبنای ترکیب المان محدود طیفی و شاخص خسارت انرژی کرنشی مودال و همچنین ترکیب الگوریتم ژنتیک و رگرسیون بردار پشتیبان برای تشخیص وتخمین میزان شدتخسارت میباشد. یکی از روشهای کارآمد درحوزه انتشار امواج روش المان محدود طیفی بوده که از قابلیت مدلسازی با انعطافپذیری بالا و تشخیص خسارات ریز میباشد. روشهای مبتنی بر ارتعاش بطور گسترده برای تشخیص خسارت سازهها استفاده میگردد درحالیکه شاخص خسارت انرژی کرنشی مودال از حساسیت بالاتری در تشخیص خسارت در میان دیگر روشهای مبتنی برارتعاش برخوردار است. مدل مورد تحقیق، پلکروچایلد درغرب کانادا میباشد که دارای ویژگیهای خاصی از نظرهندسی و هم از مشخصات المانهای سازهای میباشد. در این تحقیق شاخص خسارت انرژی کرنشی مودال به علت تغییر مقطع در طول شاهتیرها اصلاح گردیده است. همچنین از رگرسیون بردار پشتیبان به عنوان یک تکنیک قدرتمند در تخمین میزان شدت خسارت استفاده شده است. جهت افزایش دقت و بهبود روش تخمین میزان شدت خسارات از الگوریتم ژنتیک برای بهینهسازی پارامترهای مؤثر رگرسیون بردار پشتیبان استفاده میگردد. روش ترکیبی الگوریتم ژنتیک و رگرسیون بردار پشتیبان توانسته است به نحو مطلوبی شدت خسارات را تخمین بزند.
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