Abstract




 
   

IJE TRANSACTIONS C: Aspects Vol. 30, No. 9 (September 2017) 1298-1308   

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  AN INVESTIGATION ON THE PARAMETERS INFLUENCING THE POUNDING IN HIGHWAY BRIDGES
 
M. Hoseinzadeh and S. Pourzeynali
 
( Received: January 20, 2017 – Accepted in Revised Form: July 07, 2017 )
 
 

Abstract    The present aim of this study is to investigate the effect of different parameters influencing pounding in highway bridges. Pounding is the result of a collision between two parts of the deck and/or the deck and abutments at the separation distance during the earthquake. In the present study, the period ratio of the adjacent frames, ground motion spatial variation, and soil-structure interaction were considered as the significant parameters influencing the pounding. Accordingly, 144 different models of bridge were generated by changing characteristics of the piers and spans length, and were subjected to non-linear dynamic analysis. The results indicated that ignoring the effects of soil-structure interaction and ground motion spatial variation led to calculate unrealistic responses in the bridges. Finally, it is found that designing bridges including frames with similar or close period is not regarded as an appropriate solution to reduce the pounding effects in the bridges.

 

Keywords    Bridge, Pounding, Ground motion spatial variation, Soil-structure interaction

 

چکیده    این مطالعه به بررسی اثر پارامترهای موثر بر ایجاد ضربه در پل‌ها می‌پردازد. پدیده ضربه در اثر برخورد بین دو بخش از عرشه، یا عرشه و پایه‌های کناری پل در محل درزهای انقطاع به علت پاسخ‌های غیر هم‌فاز در هنگام زلزله رخ می‌دهد. پارامترهای مورد برسی شامل: نسبت دوره تناوب قاب‌های مجاورهم، حرکات ناهمگون زمین و اندرکنش خاک-سازه می‌باشند. بدین منظور 144 نمونه مختلف از پل با تغییر در مشخصات پایه‌ها و اندازه دهانه‌ها ایجاد گردیده و تحت تحلیل‌های دینامیکی غیرخطی قرار می‌گیرند. نتایج نشان می‌دهد که عدم ملاحظه اثر اندرکنش خاک-سازه و حرکات ناهمگون زمین موجب محاسبه پاسخ‌های غیرواقعی در پل‌ها می‌گردد. همچنین، به علت پاسخ‌های غیر هم‌فاز ایجاد شده در اثر حرکات ناهمگون زمین و اندرکنش خاک-سازه، طراحی پل‌ها با قاب‌های دارای دوره تناوب مشابه یا نزدیک به هم، راهکار مناسبی برای کاهش خسارات ناشی از پدیده ضربه نمی‌باشد.

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