بررسی توزیع فضایی زلزله بر منحنی‌های شکنندگی اجزای پل‌های بزرگراهی با نشیمن مورب در حوزه دور و نزدیک زلزله

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشآموخته کارشناسی ارشد مهندسی زلزله، دانشگاه بین‌المللی امام خمینی (ره)، قزوین

2 استادیار، گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه بین المللی امام خمینی(ره)، قزوین، ایران

چکیده

در این مطالعه، اثر عدم قطعیت زاویه برخورد زلزله به سازه در افزایش تقاضای مهندسی اجزای پل‌های بزرگراهی مورد بررسی قرار گرفت. بدین منظور، تحلیل‌های دینامیک غیرخطی با استفاده از 80 شتاب‌نگاشت (40 شتاب‌نگاشت حوزه نزدیک و 40 شتاب‌نگاشت حوزه دور) در 12 جهت مختلف (از صفر تا 180 درجه) بر مدل‌های عددی پل‌های با نشیمن مورب (از صفر تا 60 درجه) انجام گرفت. اجزای منحنی‌های شکنندگی به‌دست‌آمد و پاسخ فوق با نتایج تحلیل با اعمال زلزله در راستاهای اصلی مقایسه گردید. میزان اختلاف تا 65% مشاهده شد. همچنین، با استفاده از دوران محورهای دریافت پاسخ، تقاضای ایجاد شده در راستاهای مختلف صفحه (از صفر تا 360 درجه) محاسبه شد تا اثر دوران محور دریافت پاسخ بر پاسخ پل بررسی گردد. نتایج نشان ‌داد که بین شدت­های نظیر زلزله در احتمال خرابی 50% در ستون پل، در حالتی که زلزله در راستاهای مختلف به سازه اعمال شود و محور دریافت پاسخ برای ثبت بیشینه پاسخ دوران داده شود، با حالتی که راستای اعمال زلزله و ثبت تقاضا منطبق بر محورهای طولی و عرضی پل باشد، 39% اختلاف وجود دارد. همچنین، این اختلاف، با افزایش زاویه نشیمن مورب پل رابطه مستقیم دارد.
 

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Ground Motion Spatial Distribution on the Fragility of Skewed Highway Bridge Components under Far-field and Near-field Ground Motions

نویسندگان [English]

  • Hamidreza Noori 1
  • Mohammad Mahdi Memarpour 2
  • Mansour yakhchalian 2
1 Graduated MSc. of Earthquake Engineering, Imam Khomeini International University, Qazvin, I. R. Iran.
2 Assistant Professor, Department of Civil Engineering, Faculty of Engineering & Technology, Imam Khomeini International University, Qazvin, Iran
چکیده [English]

The aim of this study was to determine the effects of uncertainty of incident angle on maximum values of engineering demand parameters (EDPs) in highway bridges. Thus, 80 ground motion pairs (40 far-field and 40 near-field ground motion pairs) are imposed on numerical models of a set of skewed bridges (0 to 60 degrees) in 12 various directions (0 to 180 degrees) by performing non-linear dynamic analyses. The components of fragility curves were obtained and compared to the results of the imposed excitations in the principal directions. The difference was up to 65%. Also, using rotation of response axes, the created demands in different directions (0 t0 360 degrees) were calculated to investigate the effect of rotation of response axis on bridge reponse. Results showed that there is 39% between excitation intensities in 50% failure probability in bridge column, when excitation is in different directions on the structure and the response axis is rotated to record maximum response, and the case where direction of imposing the excitation and recording demand correspond to longitudinal and transverse directions of the bridge. Also, this difference has direct relationship with increase of skew angle of the bridge.

کلیدواژه‌ها [English]

  • Bridge seismic behavior
  • Incident Angle
  • Skewed bridge
  • Fragility curve
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