تحلیل خطر لرزه ای و تهیه طیف خطر شهر مشهد جهت طراحی و اجرای زیرساخت‏های شهری و برون شهری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار، گروه مهندسی عمران، واحد تهران شرق، دانشگاه آزاد اسلامی، تهران، ایران

2 استادیار، گروه مهندسی عمران، دانشگاه سمنان، سمنان، ایران

3 دانش آموخته کارشناسی ارشد، گروه مهندسی عمران، واحد تهران شرق، دانشگاه آزاد اسلامی، تهران، ایران

10.22034/tri.2023.115391

چکیده

تجربه زلزله‌های اخیر و خسارت‌های ناشی از آن در انواع سازه‌ها از جمله شریان‌های حیاتی و زیرساخت‌های حمل و نقل، محققین را بر آن می‌دارد که نسبت به بررسی و بازنگری مجدد پارامترهای لرزه‌خیزی موثر در مناطق مختلف در مقایسه با شتاب طرح ارائه شده در آیین نامه‌های مربوطه، اقدام نمایند. در این پژوهش، به بررسی و تحلیل خطر لرزه‌ای و تهیه طیف خطر یکسان شهر مشهد با استفاده از روش احتمالاتی و تعیینی پرداخته شده است. بدین صورت که منحنی خطر لرزه‌ای و طرح طیف شهر مشهد در منطقه ای به مساحت 100 کیلومترمربع در شبکه‌های 1×1 کیلومترمربعی و در نظر گرفتن پارامترهای موثر بر آن از جمله تعیین گسل‌های فعال منطقه، طول موثر گسل‌ها، حداکثر رخداد زلزله و فاصله موثر از گسل‌ها، با فرض خطی بودن چشمه‌های لرزه‌ای و استفاده از روابط کاهندگی متفاوت، محاسبه و مقایسه گردیده است. نتایج نشان می‌دهند که حداکثر شتاب افقی سنگ بستر در منطقه مورد مطالعه با روش تعیینی g49/1 و همچنین با استفاده از روش احتمالاتی، مقادیر آن برای دوره بازگشت‌های مختلف در طول عمر مفید 50 سال با احتمال 2 درصد، 5 درصد و 10 درصد به ترتیب g61/0، g43/0 و g34/0 بدست آمده و طیف خطر یکنواخت شهر مشهد به کمک روش‌های مختلف و رابطه کاهندگی طیفی قدرتی و همکاران ارائه شده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Seismic Hazard Analysis and Preparation of Risk Spectrum in Mashhad for Design, Construction Urban and Suburban Infrastructures

نویسندگان [English]

  • Omid Tavasoli 1
  • Adel Asakereh 2
  • Navid Tavasoli 3
1 Associate Professor, Department of Civil Engineering, East Tehran Branch, Islamic Azad University, Tehran, Iran.
2 Assistant Professor, Department of Civil Engineering, University of Semnan, Iran.
3 M.Sc., Grad., Department of Civil Engineering, East Tehran Branch, Islamic Azad University, Tehran, Iran.
چکیده [English]

The experience of recent earthquakes and the damage caused by it in various types of structures including vital arteries and transportation infrastructure suggests that researchers are more concerned with investigating and revising the effective seismic parameters in different regions compared with the proposed acceleration of codes. In this research, the study of seismic risk analysis and design hazard spectrum in Mashhad city located in Khorasan Razavi province have been conducted using probabilistic and deterministic methods. Thus, the seismic hazard curve and the spectrum design have been calculated and compared in an area of 100 km2 in 1 × 1 km2 networks and considering the effective parameters on it, including determining the active faults as a linear seismic sources and their effective length and distance, the maximum earthquake occurrence with applying of different attenuation relations. The obtained results indicate that the maximum ground acceleration in Mashhad city was determined 1.49g by the deterministic method and also its values for the return period of 50 years, including the probability of 2, 5, and 10 percent were respectively calculated and estimated 0.34g, 0.43g, and 0.61g by probabilistic method and the uniform risk spectrum was prepared using various methods by considering Ghodrati Amiri et al. attenuation relation.

کلیدواژه‌ها [English]

  • Seismic Hazard Analysis
  • Mashahad
  • Uniform Hazard Spectrum
  • Probabilistic Method
  • Deterministic Method

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