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تأثیر محصورشدگی فعال و عناصر برشگیر در رفتار خمشی تیر های لولهای فولادی پرشده با بتن | ||
نشریه مهندسی عمران و محیط زیست دانشگاه تبریز | ||
مقاله 5، دوره 46.2، شماره 83، شهریور 1395، صفحه 47-60 اصل مقاله (1.08 M) | ||
نوع مقاله: مقاله کامل پژوهشی | ||
نویسندگان | ||
مرتضی نقی پور* 1؛ مرضیه نعمتی1؛ جواد جلالی1؛ مهدی نعمت زاده2 | ||
1دانشکده مهندسی عمران، دانشگاه صنعتی نوشیروانی بابل | ||
2دانشکده فنی و مهندسی، دانشگاه مازندران | ||
چکیده | ||
در این تحقیق رفتار خمشی تیرهای مرکب فولادی پرشده با بتن به صورت آزمایشگاهی بررسی شده است. هدف اصلی از این تحقیق، بررسی اثر لغزش بین لوله فولادی با هسته بتنی در رفتار خمشی تیرها بوده است. به منظور بهبود رفتار تیرهای مرکب فولادی پرشده با بتن، از دو روش نصب برشگیر در سطح داخلی لوله و محصورشدگی فعال هسته بتنی استفاده شده است. چهار تیر مرکب در این مطالعه آزمایش شدند. تعبیه برشگیرها و نوع محصورشدگی دو پارامتر اصلی متغیر در این تحقیق بودند. در نهایت، مقاومت خمشی نهایی، انعطافپذیری، مود شکست، وضعیت ترک خوردگی مقطع در لحظه شکست و تغییرات سختی در مرحله الاستیک و پلاستیک تیرهای مرکب، پارامترهایی بودند که بررسی شدند. نتایج حاصله نشان میدهد که تعبیه برشگیر و محصورشدگی فعال، بر روی افزایش ظرفیت خمشی تیر مرکب اثر چشمگیری داشته است. همچنین، نصب برشگیر سبب افزایش بیشتری در ظرفیت خمشی نسبت به محصورشدگی فعال میگردد. به علاوه، تعبیه برشگیر و تغییر نوع محصورشدگی، منجر به رفتار تردتر نمونهها شده است. ضمن این که، نمونهای که در آن برشگیر نصب شده است دارای رفتار بسیار تردتری نسبت به نمونه با محصورشدگی فعال میباشد. به علاوه، در اثر تعبیه برشگیر در نمونه، میزان جذب انرژی نمونه حدود 40 درصد کاهش مییابد. در حالی که، تغییرات میزان انرژی جذب شده با تغییر در نوع محصورشدگی، قابل چشم پوشی میباشد. | ||
کلیدواژهها | ||
محصورشدگی فعال؛ برشگیر؛ رفتار خمشی؛ لوله فولادی پرشده با بتن؛ بتن تازه؛ ظرفیت خمشی نهایی | ||
مراجع | ||
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