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اثرات جهت موج زلزله بر پاسخ دینامیکی سدهای خاکی- مطالعهی موردی: سد شهدا | ||
نشریه مهندسی عمران امیرکبیر | ||
مقاله 13، دوره 54، شماره 10، دی 1401، صفحه 3879-3902 اصل مقاله (2.42 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22060/ceej.2022.20460.7432 | ||
نویسنده | ||
یزدان شمس ملکی* | ||
دانشکده مهندسی، دانشگاه صنعتی کرمانشاه، کرمانشاه، ایران | ||
چکیده | ||
در این مقاله اثرات نامنظمی در جهات اولیه بارگذاریهای لرزهای بر پاسخهای تاریخچه-زمانی غیرخطی سد شهدا مطالعه شده است. حداکثر مقطع عرضی سد، در شرایط تراز نرمال دریاچه آن، توسط روش اجزای محدود دو بعدی شبیهسازی شده است. رکورد شتاب زلزله نزدیک-گسل طبس به عنوان بارگذاری دینامیکی به مدلهای عددی اعمال شده است. سه الگوی اصلی بارگذاری جهتی افقی، قائم و مایل برای بررسی اثرات جهات اولیه انتشار حرکات لرزهای در نظر گرفته شده است. در هر مورد پاسخهای لرزهای نسبت به مورد مرجع بارگذاری در جهت افقی بالا دست به پایین دست مخزن مقایسه شده است. برای مدلسازی مصالح بدنه و پی سد به ترتیب از مدل رفتاری خاک سخت شونده با کرنش کوچک HS-small و مدل ارتجاعی-خمیری کامل مور-کولمب استفاده شده است. اهمیت و ضرورت انجام این تحقیق در تقریب محافظهکارانه شبیهسازی شرایط بارگذاری سه بعدی در تحلیلهای عددی دو بعدی است. تا به حال در اغلب مدلهای دو بعدی، راستای اولیه حرکات لرزهای ورودی فقط در جهات و افقی یا قائم بوده است، که در این تحقیق سعی شده که این الگو با حالات ممکن دیگر بارگذاری جهتی، مقایسه شود. نتایج مطالعه حاضر نشان میدهد که حالت بارگذاری لرزهای با جهت انتشار اولیه مایل، با زاویه 45 درجه، بیشترین اثر بر پاسخهای لرزهای سد نسبت به حالات بارگذاری افقی یا قائم را ایجاد میکند. | ||
کلیدواژهها | ||
نامنظمی حرکات ورودی؛ بارگذاری لرزهای؛ سد خاکی؛ تحلیل غیرخطی؛ مدل رفتاری | ||
موضوعات | ||
سدهای خاکی | ||
عنوان مقاله [English] | ||
Effects of Earthquake Wave Direction on Dynamic Response of Earth Dams - Case Study: Shohada Dam | ||
نویسندگان [English] | ||
Yazdan Shams Maleki | ||
Kermanshah university of technology | ||
چکیده [English] | ||
In this paper, the irregularity effects in the initial directions of the seismic loading on the nonlinear time-history responses of the Shohada dam have been investigated. The maximum cross-section of the dam has been simulated by the 2D finite element method under normal lake-level conditions. The near-fault acceleration record of the Tabas earthquake has been applied as dynamic input motion to the two-dimensional numerical models. Numerical analysis has been conducted in the Newmark explicit time integration scheme framework. The main three patterns of horizontal, vertical, and oblique directional seismic loading are considered to investigate the effects of the initial directions of seismic motion propagation. In each case, the seismic responses are compared to the conventional seismic loading responses in the horizontal direction from the upstream (reservoir) to the downstream of the dam. The hardening soil model with small strain (HS-small) and the Mohr-Coulomb model were used to model the dam's body and the foundation materials, respectively. In most 2D simulations, the initial direction of the input seismic movements has been only in one or two dimensions and in the horizontal or vertical orientation. This study has attempted to compare these traditional seismic loading patterns with other possible states in 2D numerical models. The present study results show that the seismic loading mode with the initial direction of inclination of 45 degrees has the worst and most significant effect on the seismic response of the dam compared to the traditional method of horizontal loading. | ||
کلیدواژهها [English] | ||
Irregular input motions, Seismic loading, Earth dam, Non-linear analysis, Constitutive model | ||
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مراجع | ||
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