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تأثیر انتشار امواج حجمی مایل بر پاسخ سینماتیکی شالوده های نواری صلب بر روی توده نیمه بینهایت خاک به کمک روش المان مرزی | ||
| نشریه مهندسی عمران و محیط زیست | ||
| مقاله 1، دوره 55، شماره 121، 1404، صفحه 1-13 اصل مقاله (1.71 M) | ||
| نوع مقاله: مقاله کامل پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22034/ceej.2024.60394.2325 | ||
| نویسندگان | ||
| فروغ اشکان1؛ عباس اسلامی حقیقت* 2 | ||
| 1گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه مراغه | ||
| 2گروه مهندسی عمران، دانشکده مهندسی عمران، دانشگاه ارومیه | ||
| چکیده | ||
| تحلیل لرزه ای شالوده ها از جمله مسائل مطرح در مهندسی ژئوتکنیک لرزه ای بوده و بدینمنظور دو روش کلی پیشنهاد میشود. در روش مستقیم، کل سازه و شالوده به همراه خاک بستر مدلسازی شده اما در روش زیرسازه، پاسخ های شالوده و سازه به صورت گام به گام محاسبه گردیده و تأثیر سختی و جرم اجزای مختلف سازه و همچنین شالوده مورد بررسی قرار میگیرد. در این مقاله، پاسخ لرزهای شالودههای سطحی نواری تحت امواج ورودی هارمونیک مایل حجمی SV. P و SH به کمک روش المان مرزی مورد بررسی قرار میگیرد. بدین منظور در ابتدا، توابع امپدانس (Impedance Functions) شالودههای نواری واقع بر توده بینهایت خاک با روش المان مرزی و استفاده از المانهای سه گرهی کوادراتیک (Quadratic) محاسبه میشوند. توابع امپدانس محاسبه شده به فرکانس، عرض شالوده نواری، سرعت موج برشی و نیز ضریب پواسون توده خاک بستگی دارند. در ادامه، شالوده نواری تحت اموج حجمی SV. P و SH تحت زوایای مختلف قرار گرفته و با درنظر گرفتن پاسخ میدان آزاد و استفاده مجدد از روش المان مرزی، حرکت ورودی به شالوده به دست میآید. مشاهده میشود که پاسخ شالوده در فرکانس بی بعد 3، نسبت به پاسخ میدان آزاد و برای مؤلفه افقی موج SV و SH نیز برای مؤلفه قائم موج P در زاویه 𝛉=30o به ترتیب %41، %38 و 20% کاهش پیدا می کند. همچنین به عنوان مثالی در حوزه زمان، پاسخ شالوده نواری سطحی به یک موج مایل SV با تغییرات در قالب موج ریکر (Ricker wave) بهکمک الگوریتم FFT تحلیل گردید. | ||
| کلیدواژهها | ||
| روش المان مرزی؛ اندرکنش سینماتیک خاک و سازه؛ شالوده نواری صلب؛ توابع امپدانس؛ حرکت ورودی به شالوده؛ امواج حجمی | ||
| مراجع | ||
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