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ارزیابی اثر ارتفاع ستون و تعداد دهانه بر روی آسیب پذیری لرزه ای پله ای قوسی چند دهانه عرشه باکس بتن آرمه | ||
| نشریه مهندسی عمران امیرکبیر | ||
| مقاله 11، دوره 50، شماره 3، مرداد و شهریور 1397، صفحه 529-542 اصل مقاله (1.22 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2017.12135.5130 | ||
| نویسندگان | ||
| حسین پهلوان1؛ علی ناصری* 2؛ صالح رفیعی3؛ هدی باقری3 | ||
| 1دانشکده مهندسی عمران، دانشگاه صنعتی شاهرود، شاهرود، ایران | ||
| 2دانشکده مهندسی عمران، دانشگاه صنعتی نوشیروانی بابل،مازندران، ایران | ||
| 3دانشکده مهندسی عمران، موسسه آموزش عالی پردیسان، مازندران، ایران | ||
| چکیده | ||
| پل ها به عنوان یکی از اصلی ترین و آسیب پذیرترین سازه ها در شریانهای حیاتی هر کشور محسوب می شوند. تعداد زیادی از پل های عرشه جعبه ای بتن آرمه در دنیا دارای قوس در پلان و درزمیانی هستند که پلهای قوسی چندقابی نامیده می شوند. وجود انحنا و درزمیانی در عرشه جعبه ای شکل پل های بتن آرمه باعث بروز رفتار دینامیکی پیچیده شده و میزان آسیب پذیری لرزهای اینگونه از پل ها در قیاس با پل های بدون قوس بیشتر خواهد بود. هدف این مقاله بررسی تاثیر اختلاف ارتفاع پایه های پل و تعداد دهانه در رفتار لرزهای پل های قوسی شکل عرشه باکس بتن آرمه می باشد. بدین ترتیب، پنج پل با تعداد دهانه ها و ارتفاع پایه های متفاوت در نرمافزار Csi Bridgeمدلسازی شدند. نتایج این پژوهش نشان داده است که افزایش ارتفاع ستونها و کاهش تعداد دهانه ها سبب افزایش تغییر مکان نسبی پل و افزایش میزان آسیب پذیری پلها میگردد. به طوری که حداکثر تغییر مکان نسبی در مدل چهار دهانه با ارتفاع های متفاوت 1.25H-1.5H-Hو 1.75H-2.5H-Hنسبت به مدل چهار دهانه پایه ها یکسان به ترتیب 11/3و 33/31درصد افزایش می یابد، که در مدل سه دهانه این مقدار به 81/33 درصد افزایش و در مدل پنج دهانه 40/38درصد کاهش تغییر مکان نسبی، نسبت به مدل چهار دهانه مبنا می گردد. | ||
| کلیدواژه‌ها | ||
| پل قوسی بتنی؛ اختلاف ارتفاع پایه‌ها؛ تغییر مکان نسبی ستونها؛ رفتار لرزهای؛ آنالیز تاریخچه زمانی غیر خطی | ||
| موضوعات | ||
| تحلیل خطی و غیر خطی؛ دینامیک سازه | ||
| عنوان مقاله [English] | ||
| Seismic Vulnerability Assessment of Horizontally Curved Multi frame RC BoxGirder Bridges Considering the Effect of Column Heights and Span Numbers | ||
| نویسندگان [English] | ||
| H. Pahlavan1؛ A. Naseri2؛ S. Rafiei3؛ Hoda Baghery3 | ||
| 1Civil Engineering Department, Shahrood University of Technology, Semnan, Iran | ||
| 2Civil Engineering Department, Babol Noshirvani University of Technology, Mazandaran, Iran | ||
| 3Civil Engineering Department, University of Pardisan, Mazandaran, Iran | ||
| چکیده [English] | ||
| Bridges are known to be one of the most vital and vulnerable components of any transportation system. A majority of highway bridges in the world have curved superstructure configurations and also have in-span hinges. The curvature and in-span hinges in multi-frame bridges lead to significant differences in bridge dynamic response during seismic excitations. This article explores the seismic response of concrete curved bridges considering columns height differences and the effects of span number. Five bridge models have been studied including: a four-span bridge model with equal column height as the base model, two bridge models with non-uniform columns height, a three-span bridge and a five-span bridge models having different span numbers. Several dynamic non-linear time history analyses are performed based on seven different records. The results showed that increasing the height of columns and reducing the number of spans in this subclasses of bridges lead to increase the peak of columns drifts and consequently the bridge seismic vulnerability. | ||
| کلیدواژه‌ها [English] | ||
| Concrete Curved Bridge, Columns Height Difference, Columns Drift, Seismic Response | ||
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سایر فایل های مرتبط با مقاله
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| مراجع | ||
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