تحلیل خطر احتمالاتی با اعمال اثرات رفتار غیرخطی خاک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، دانشکده مهندسی عمران، دانشگاه تبریز

2 کارشناسی ارشد، دانشکده مهندسی عمران، دانشگاه تبریز

چکیده

مطالعات انجام گرفته در خصوص رفتار خاک بیانگر این واقعیت است که لایه‌های خاک تحت اثر زلزله‌های قوی عموماً وارد محدوده‌ رفتار غیرخطی می‌شود. این در حالیست که در تحلیل خطر متداول، رفتار خاک بصورت خطی فرض می‌شود. این مقاله سعی دارد طیف خطر بر روی بستر سنگی را با منحنی های تشدید حاصل از تحلیل های دینامیکی جهت تهیه طیف ویژه ساختگاه ترکیب نماید. بدین منظور ساختگاه‌های مختلف با مشخصات دینامیکی مشخص و قطعی در دو شهر تبریز و تهران انتخاب و تحلیل خطر احتمالاتی در این مناطق با اعمال اثرات غیرخطی خاک انجام گرفته است. در ادامه با استفاده از ضرایب ارائه شده براساس مدلسازی مونت کارلو و در مرحله بعدی به کمک تحلیل دینامیکی و دستیابی به منحنی تشدید، طیف پاسخ ویژه ساختگاه محاسبه شده است. بررسی نتایج نشان می‌دهد، در صورتی که مشخصات دینامیکی لایه‌های خاک مشخص و قطعی نباشند، روش پیشنهادی بر اساس مدلسازی مونت کارلو با دقت خوبی می‌تواند مورد استفاده قرار گیرد.

کلیدواژه‌ها

عنوان مقاله [English]

Probabilistic Seismic-Hazard Analysis (PSHA) Considering Nonlinear Soil-Site Effects

نویسندگان [English]

  • Saman Yaghmaei Sabegh 1
  • Roya Motalebzadeh 2
1 Associate Professor, Department of Civil Engineering, Tabriz University, Tabriz, Iran
2 M.Sc. Student, Department of Civil Engineering, Tabriz University, Tabriz, Iran
چکیده [English]

Studies on the behavior of soil layers reflect the fact that the soil is generally enter the range of nonlinear behavior during strong ground motions that have received increased attention in recent years. Conventional seismic hazard analysis often assumes a linear behaviour for soil with considering of a generic-attenuation relation. Generally, for site response analysis, the amplification function is required that is depend on dynamic property of different soil layers, are not known for different parts of the world. This paper is aimed at presenting a straightforward approach for estimating seismic hazard curves taking into account nonlinear soil-site effects. This approach convolves numerically the probabilistic seismic hazard analysis (PSHA) at bedrock with the nonlinear response of soil computed via dynamic analysis. Applications of proposed method has been shown for two different sites located in Tehran and Tabriz, one sandy and one clayey. A Monte Carlo based approach was used for characterization of amplification function values along with those of deterministic curved obtained in the study areas. It is concluded that that the proposed model can give satisfactory accuracy for predicting seismic hazard curves when there is a lack of detailed information of dynamic soil properties.

کلیدواژه‌ها [English]

  • Probabilistic seismic hazard analysis
  • nonlinear behavior of soil
  • uniform hazard spectra
  • amplification function

مراجع

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