بررسی تأثیر تعداد دهانه بر احتمال رخداد فروریزش لرزه ای در قاب‌های خمشی و مهاربندی

نوع مقاله : مقاله علمی-پژوهشی

نویسندگان

1 استادیار دانشکده عمران دانشگاه ایوانکی، سمنان، ایران

2 گروه عمران، دانشکده مهندسی، دانشگاه ایوان کی

3 گروه عمران، دانشکده مهندسی، واحد مشهد، دانشگاه آزاد اسلامی، مشهد، ایران

چکیده

فروریزش لرزه­ای ساختمان­ها سطحی از عملکرد سازه­ای است که در آن میزان خسارت به حداکثر خود می­رسد، لذا این رخداد می­تواند ناگوارترین حادثه در صنعت ساخت‌وساز باشد. با توجه به لرزه خیزی ایران، ارزیابی دقیق­تر فروریزش سازه­ها تحت زلزله از چالش­های مهم مهندسی سازه می‌باشد. در این مقاله، به بررسی اثر تعداد دهانه‌ بر پاسخ لرزه‌ای سه مجموعه قاب فولادی کوتاه مرتبه پرداخته ‌شده است. در هر سه مجموعه، یک نمونه قاب خمشی و دو نمونه قاب مهاربندی شده هم محور و  برون‌محور منظم می­باشد که تعداد دهانه‌ها در هر سه مجموعه قاب به ترتیب 2، 3 و  4 در نظر گرفته شده است. ابتدا، قاب­ها تحت تحلیل‌ استاتیکی غیرخطی بار افزون بر مبنای برش پایه و تغییر مکان بام قرار گرفته تا مکانیسم­های خرابی محتمل قاب­های مذکور مشخص شود.  در ادامه، تحلیل دینامیکی غیرخطی افزایشی با پارامتر سنجه شدت (IM) متناظر با بیشینه جابجایی نسبی بین طبقه‌ای و پارامتر سنجه خسارت (DM) متناظر با شتاب طیفی مد اول (T1, 5%)  Saلحاظ شده و سطح عملکرد جلوگیری از فروریزش  (CP) بررسی گردیده است. نتایج حاصله از منحنی‌های شکنندگی در حالت حدی بیانگر این مطلب است که با افزایش تعداد دهانه، احتمال خرابی ده درصد برای تمامی قاب­های موردمطالعه افزایش و به‌تبع میزان آسیب‌پذیری آن­ها کاهش‌یافته است.

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