ارزیابی روش های تحلیل حساسیت در قاب خمشی بتن آرمه در معرض آتش سوزی پس از زلزله

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

دانشکده مهندسی عمران، دانشگاه صنعتی نوشیروانی بابل

چکیده

حوادث متعددی ایمنی­ سازه را به ­خطر می‌اندازد. این حوادث می‌تواند پشت سرهم اتفاق افتند. آتش‌سوزی پس از زلزله جزئی از رخدادهای متوالی است که ایمنی سازه را تهدید می‌کند. مقاومت سازه‌ها در برابر بار آتش و بار آتش پس از زلزله متفاوت است. هدف از این تحقیق بررسی روش‌ها و تأثیر پارامترهای مختلف بر مقاومت قاب‌های بتن‌آرمه تحت در سناریوی آتش‌سوزی پس از زلزله است. برای این منظور یک قاب هفت طبقه‌ بتن‌آرمه طراحی و به‌صورت مکانیکی- حرارتی مدل‌سازی شده است. پس از مدل‌سازی با استفاده از سه روش شبیه‌سازی مونت‌کارلو (Monte Carlo simulation (MCS))، دیاگـرام ترنادو (Tornado Diagram Analysis (TDA)) و تحلیل مرتبه اول ممان دوم (First-Order Second Moment (FOSM)) تأثیر پارامترهای طراحی بر مقاومت قاب بتن‌آرمه در بارگذاری آتش‌سوزی پس از زلزله بررسی‌شده است. در این تحقیق با استفاده از تحلیل استاتیکی غیرخطی، قاب بتن‌آرمه پس از پوش در سطوح مختلف عملکرد، در معرض بار آتش ISO 834 قرار گرفته و تحلیل‌های حساسیت برای آن انجام شده است. نتایج حاصل از تحلیل نشان می‌دهد در بین پارامترهای طراحی تنش تسلیم آرماتور بیش­ترین تأثیر را بر زمان گسیختگی قاب بتن‌آرمه دارد. همچنین روش FOSM خطای کم­تری را نسبت به روش TDA در بارگذاری آتش ­سوزی پس از زلزله دارد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of Sensitivity Analysis Methods in RC Frame Exposed Post-Earthquake Fire

نویسندگان [English]

  • Majid Moradi
  • Hamidreza Tavakoli
  • Gholamreza Abdollahzadeh
Department of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran
چکیده [English]

In this research, a 7-story three-dimensional structure with 4span (5-meter) with a square plan is considered. After the initial design, the mid-frame of the structure has been selected as a frame for mechanical-thermal analysis. In this research, pushover analysis is used to simulate structural behavior in seismic load. Three levels of IO, LS, and CP are considered for assessing the behavior of the structure in the post-earthquake fire scenario in the pushover analysis. The failure time of a concrete frame decreases in post-earthquake fire loading by increasing the level of performance. This reduction is 51% for the LS level and 29% for the CP level. It shows that rupture time has the highest sensitivity to seismic load. At all performance levels, among the design parameters, the yield stress of the armature has the highest sensitivity among other variables. The modulus of elasticity of the armature and the length of the span have the least sensitivity among different parameters.

کلیدواژه‌ها [English]

  • Post-Earthquake Fire
  • Sensitivity Analysis Method
  • RC Frame
  • Consecutive Event
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