Abstract




 
   

IJE TRANSACTIONS B: Applications Vol. 31, No. 2 (February 2018) 196-203   

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  A SIMPLIFIED MODAL PUSHOVER ANALYSIS-BASED METHOD FOR INCREMENTAL DYNAMIC ANALYSIS OF REGULAR RC MOMENT-RESISTING FRAMES
 
M. Jalilkhani and A. R. Manafpour
 
( Received: October 06, 2017 – Accepted in Revised Form: November 30, 2017 )
 
 

Abstract    Incremental Dynamic Analysis (IDA) procedure is now considered as a robust tool for estimating the seismic sidesway collapse capacity of structures. However, the procedure is time-consuming and requires numerous nonlinear response-history analyses. This paper proposes a simplified Modal Pushover Analysis (MPA) procedure for IDA of RC moment-resisting frames. The proposed method uses the dynamic response of an equivalent single-degree-of-freedom (SDOF) system, characterized by a bilinear relationship between the lateral force (F) and roof-displacement (D). The F-D relationship is determined by the ‘first-mode’ pushover analysis of the structure. Four regular RC moment-resisting frames designed based on the current US building codes are selected and subjected to the proposed method. The analysis results obtained from the original MPA-based IDA method, SPO2IDA and the method proposed by Shafei et al are also presented for comparison. The performance of the proposed method is then evaluated through comparisons with the results obtained from IDAs. The results show that the proposed method is able to efficiently estimate the dynamic capacity of the example buildings for different seismic performance levels. Nonetheless like to MPA-based IDA and SPO2IDA methods less accueate results are obtained by the proposed procedure for 16% and 84% IDA fractiles in most case studies.

 

Keywords    sidesway collapse capacity, pushover analysis, IDA method, RC moment-resisting frame

 

چکیده    در حال حاضر تحلیل دینامیکی فزاینده (IDA) به عنوان ابزاری قدرتمند جهت تخمین ظرفیت فروریزش لرزه­ای جانبی سازه­ها به شمار می­آید. با این حال، روش زمان­بر بوده و نیازمند تعداد زیادی تحلیل تاریخچه زمانی غیرخطی می­باشد. این مقاله یک روش ساده­شده از تحلیل پوش­اور مودال (MPA) را به منظور تحلیل دینامیکی فزاینده قاب­های خمشی بتن­آرمه پیشنهاد می­کند. روش پیشنهادی از پاسخ دینامیکی یک سیستم تک درجه آزاد (SDOF) معادل که از یک رابطه دوخطی موجود بین نیروی جانبی (F) و جابجایی بام (D) تبعیت می­کند، استفاده می­نماید. این رابطه F-D از طریق تحلیل پوش­اور نظیر مود اول سازه به دست می­آید. چهار قاب خمشی بتن­آرمه منظم طراحی شده بر اساس آئین­نامه­های ساختمانی حال حاضر آمریکا انتخاب شده و توسط روش پیشنهادی مورد تحلیل قرار می­گیرند. نتایج تحلیلی به دست آمده از روش اولیه MPA-based IDA، SPO2IDA و روش پیشنهادی Shafei و همکارانش نیز به منظور مقایسه ارائه می­شوند. سپس عملکرد روش پیشنهادی از مقایسه نتایج به دست آمده با نتایج حاصل از تحلیل IDA مورد ارزیابی قرار می­گیرد. نتایج نشان می­دهد که روش پیشنهادی می­تواند به طور مؤثری ظرفیت دینامیکی سازه­های مثال را به ازاء سطوح عملکرد لرزه­ای مختلف تخمین بزند. با این وجود مشابه روش­های MPA-based IDA و SPO2IDA به ازاء دهک­های %16و %84 نتایج با دقت پائین­تری توسط روش پیشنهادی برای اغلب موردهای مطالعاتی به دست آمدند.

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