اثر شعاع انحنا بر ارزیابی احتمالاتی لرزه ای پل های قوسی عرشه باکس بتن آرمه با استفاده از شبیه سازی مونت کارلو تحت تحریکات سه جهته زلزله های نزدیک گسل

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشجوی دکترا عمران سازه دانشگاه صنعتی نوشیروانی بابل

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

3 استادیار، دانشگاه صنعتی شاهرود، شاهرود، ایران

4 استاد، دانشگاه علم و صنعت، تهران، ایران

چکیده

همواره آسیب پذیری پل‌های قوسی با توجه به شرایط هندسی خاص و رفتار متفاوتی که نسبت به پل های مستقیم در جریان زلزله از خود نشان دادند، از اهمیت ویژه ای برخوردارند. لذا در این مقاله به بررسی تاثیر شعاع انحناهای مختلف بر احتمال آسیب پذیری لرزه ای پل های قوسی چندقابی عرشه باکس بتن آرمه و مقایسه آن با پل مستقیم پرداخته شد. میزان آسیب پذیری پلهای قوسی به صورت سه بعدی تحت تحریکات چندگانه (با در نظر گیری مولفه قائم زلزله ) رکوردهای نزدیک گسل مورد ارزیابی قرار گرفت. مدلهای پل در 5 شعاع مختلف تحت 80 رکورد زلزله با در نظر گیری کلیه عدم قطعت‌های تقاضا ( 14 عدم قطعیت ذاتی پل به همراه عدم قطعیت زلزله) و همچنین عدم قطعیت های ظرفیت، تحلیل دنیامیکی غیرخطی گردید. با استفاده از تکنیک لاتین هایپرکیوب از میان تمام پلهای این کلاس، 10 هندسی کاملا تصادفی که نماینده وضعیت هندسی کل جمعیت آماری پلهای عرشه باکس بتن آرمه کالیفرنیا است، برای هر شعاع پل انتخاب گردید. در انتها با انجام تحلیل های دینامیکی غیرخطی، منحنی شکنندگی مولفه های مختلف پل ترسیم گردید و اثر انحنا پل بر آسیب پذیری اجزای مختلف پل مورد بررسی قرار گرفت. سپس با مقایسه تقاضا با ظرفیت اجزای مختلف پل، با استفاده از شبیه سازی مونت کارلو، احتمال خسارت لرزه ای کل سیستم پل تخمین زده شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of curvature radius on probabilistic evaluation of seismic horizontally Curves RC Box girder bridges using Monte Carlo simulation under three-dimensional excitations under Near-Field Earthquakes

نویسندگان [English]

  • Ali Naseri 1
  • Alireza Mirza Goltabar Roshan 2
  • Hossein Pahlavan 3
  • Gholamreza Ghodrati Amiri 4
1 Ph.D. Candidate of Structural Engineering, Babol Noshirvani University of Technology, Iran.
2 Associate Professor, Faculty of Civil Engineering, Noshirvani University of ‎Technology, Babol, Iran
3 Assistant Professor, Faculty of Civil Engineering, Shahrood University of Technology, Iran
4 Professor, Department of Civil Engineering, Iran University of Science & Technology, Tehran, Iran
چکیده [English]

Curved bridges exhibit complicated responses in the course of an earthquake, due to their distinctive geometric status. Thereby in this study, the effect of different curvature radii on the seismic damage probability of curved multi-frame concrete box-girder bridges was investigated and compared to straight bridge. Three-dimensional probabilistic seismic vulnerability of the curved multi-frame concrete box-girder bridges was delved in the near-fault events subjected to three-directional ground motion excitations (considering vertical component of earthquake). Bridge models were analyzed in 5 different radii subjected to 80 near-fault earthquake records and taking into account all demand uncertainties (14 uncertainties inherent of bridge, along with the earthquake uncertainty) as well as capacity uncertainties. Of all the bridges of this class, a total of 10 completely random geometries, representing geometric status of entire statistical population of curved box-girder bridges in California, were selected for each of the six bridge radii using the Latin-Hypercube Sampling technique. Having performed nonlinear dynamic analyses, the fragility curve of each bridge component was plotted, and the curvature effect on the vulnerability of various bridge components was investigated . Thereby, comparing seismic demand with the capacity of components through Monte Carlo simulation strategy, damage probability of the bridge system was estimated.

کلیدواژه‌ها [English]

  • RC Box girder bridges
  • Effect of curvature radius
  • probabilistic seismic evaluation
  • Monte Carlo
  • Near field

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  • تاریخ دریافت: 04 آذر 1398
  • تاریخ بازنگری: 15 فروردین 1399
  • تاریخ پذیرش: 12 شهریور 1399

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