بررسی کمی عوامل موثر بر رفتار پایه‌های پل بتن مسلح در برابر سیلاب

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی عمران، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران

چکیده

ارزیابی آسیب­ پذیری پل­ ها در برابر خطر سیلاب جهت اتخاذ سیاست­ های مناسب در تعمیر و تقویت آن­ها ضروری است. هدف از مطالعه­ ی حاضر، ارائه ­ی یک الگوی نظام­ مند جهت بررسی رفتار پایه پل ­ها در برابر خطر سیلاب و حساسیت­ سنجی رفتار پل ­ها به پارامتر­های سازه­ای، ژئوتکنیکی و هیدرولیکی می­ باشد. یک مدل اجزای محدود غیرخطی سه ­بعدی با در نظر گرفتن خصوصیات مصالح و تعامل سازه با خاک و آب توسعه داده شده و پارامترهای آن با داده ­های به ­دست آمده از آزمایش بارگذاری جانبی یک تک شمع بتنی مدفون در خاک و یک نمونه­ تک پایه بتنی تحت بار محوری و جانبی صحت­ سنجی گردید. پس از همگرایی لازم بین نتایج آزمایشگاهی و عددی، مدل­ یک پایه پل­ موجود به صورت تحلیلی ساخته شده و رفتار سازه در برابر خطر سیلاب در شرایط متفاوت سازه­ای، ژئوتکنیکی و هیدرولیکی بررسی گردید. نتایج نشان ‌دهنده ­ی مناسب بودن الگوی انتخاب شده برای بررسی رفتار پایه‌های پل در برابر خطر سیلاب بوده و توانایی این رویکرد را برای شبیه­ سازی طیف وسیعی از سناریوهای مرتبط با سیلاب برای پل­ ها نشان می ­دهد. همچنین مشاهده گردید که رفتار پایه پل­ ها در برابر بار سیلاب، به پارامترهای ژئوتکنیکی و هیدرولیکی، نسبت به پارامتر‌های سازه‌ای حساسیت بیشتری داشته است؛ به گونه‌ای که با تغییر نوع خاک از دانه ­ای متوسط به دانه‌ای سست، جابجایی جانبی سازه 1/87 برابر شده است. همچنین با افزایش شیب طولی کف بستر از 0/004 به0/005 و کاهش ضریب زبری از 0/025 به 0/021، جابجایی جانبی سازه به ترتیب به میزان 2/57 و6/55  برابر مقدار اولیه آن تغییر خواهد یافت.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Quantitative study of the factors affecting the behavior of reinforced concrete bridge piers against floods

نویسندگان [English]

  • Fateme Shahaboddin
  • Mehdi Dehestani
  • Hossein Yousefpour
Babol Noshirvani University of Technology
چکیده [English]

Evaluating the vulnerability of bridges to flooding is essential for risk-informed planning of their maintenance. This paper aims to develop a systematic model for investigating the behavior of bridges at the time of flooding, in which structural, geotechnical, and hydraulic parameters are considered. A three-dimensional finite element model of reinforced concrete bridge piers was developed, in which the material nonlinearity and the interactions between the pier and the surrounding soil and the flood water were taken into account. The parameters used in the model were validated based on experimental data from a single pile and a reinforced concrete column under axial and lateral loading. The validated modeling approach was then used to simulate an existing bridge pier, for which the structural, geotechnical, and hydraulic parameters were varied to evaluate the sensitivity of the load-deformation behavior to each parameter. The results showed that the presented modeling approach is capable of providing reliable predictions of the performance of bridge piers at the time of flooding, which makes it suitable for practical vulnerability assessment of bridges. Moreover, it was observed that the behavior of the bridge piers against floods was more sensitive to geotechnical and hydraulic parameters than structural parameters, to the level that by changing the soil type from medium sand to loose sand, the lateral displacement of the structure is changed by 1.87 times. Moreover, increasing the longitudinal slope of the river from 0.004 to 0.005 and decreasing the river bed roughness coefficient from 0.025 to 0.021, increased the lateral displacement of the structure by 2.57 and 6.55 times its initial value, respectively.

کلیدواژه‌ها [English]

  • Bridge
  • Reinforced concrete
  • Flood
  • Scour
  • Finite element method

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 54، شماره 9
آذر 1401
صفحه 3333-3352

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