بررسی اثر عوارض توپوگرافی های هم جوار بر پاسخ لرزه ای ساختگاه

نوع مقاله : Articles

نویسندگان

1 دانشکده مهندسی عمران، دانشگاه تربیت دبیر شهید رجایی، تهران، ایران

2 دانشگاه تربیت دبیر شهید رجایی، تهران، ایران

چکیده

اثرات توپوگرافی می تواند طبیعت لرزش زمین را در طول زلزله تحت تأثیر قرار دهد. اگرچه خوشبختانه اثر توپوگرافی ساختگاه بر پاسخ لرزه‌ای زمین در سال های اخیر بیشتر مورد توجه قرار گرفته و در دستور کار راهنما و آیین نامه های لرزه ای گنجانده شده، ولی همچنان ابعادی از تأثیر این عامل پیچیده بر پاسخ لرزه ای ساختگاه، نیاز به مطالعه و بررسی دقیق تر دارد تا کمتر شاهد خسارات پیش‌بینی‌نشده‌ی ناشی از عامل توپوگرافی در زلزله ها و یا هرگونه حرکات لرزه ای زمین باشیم. در یک حرکت لرزه ای، توپوگرافی محیط اطراف سبب گیر افتادن و انعکاس امواج لرزه ای در بین عوارض توپوگرافی می شود و این پدیـده موجب تشدید بیشتر حـرکت لرزه ای در بین نامنظمی های توپوگرافـی می شود. در این مقاله به‌منظور بررسی چگونگی اثر عامل توپوگرافی محیط اطراف بر پاسخ لرزه ای ساختگاه، چندین مطالعه ی عددی المان  محدود با به‌کارگیری برنامه ی آباکوس (ABAQUS) انجام شده  است. نتایج نشان داد که وجود عوارض توپوگرافی بیشتر بین منبع لرزه زا و ساختگاه، سبب تشدید بیشتر حرکت لرزه ای می شود و این امر برای تپه های دورتر از منبع و نقاط خط‌الرأس توپوگرافی ها، محسوس تر است. همچنین شتاب ساختگاه بیش از سرعت و جابه جایی تحت تأثیر عامل توپوگرافی محیط اطراف (اثر متقابل توپوگرافی ها) قرار می گیرد.

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