Abstract




 
   

IJE TRANSACTIONS C: Aspects Vol. 31, No. 9 (September 2018) 1505-1513    Article in Press

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  EFFECTS OF FAR- AND NEAR-FIELD MULTIPLE EARTHQUAKES ON THE RC SDOF FRAGILITY CURVES USING DIFFERENT FIRST SHOCK SCALING METHODS
 
P. Kamrani Moghaddam and A. R. Manafpour
 
( Received: April 27, 2018 – Accepted in Revised Form: July 25, 2018 )
 
 

Abstract    Typically, to study the effects of consecutive earthquakes, it is necessary to consider definite intensity levels of the first shock. Methods commonly used to define intensity involve scaling the first shock to a specified maximum interstorey drift. In this study the structure’s predefined elastic spectral acceleration caused by the first shock is also considered for scaling. This study aims to investigate the effects of consecutive far-field (FF) and near-field (NF) ground motions on the exceedance probability of different performance levels of a reinforced concrete single degree of freedom system considering the aforementioned first shock scaling methods. Eight groups of simulations are defined with each considering a combination of FF and NF ground motions. By elastic spectral acceleration as the scaling method, it is found that the exceedance probability of the second shock performance levels, especially in pulse-like records, greatly depends on the order of far/near field ground motions and the level of damage caused by the first shock. It could be inferred that although first shock scaling method to maximum drift ratio is the commonly used method, the effects of record type multiple earthquakes are more revealed using elastic spectral acceleration as the first shock scaling criteria.

 

Keywords    First shock Intensity Scaling, Consecutive Earthquakes, Fragility Curves, Far- and Near-Field Ground Motions, Pulse Effects

 

چکیده   

معمولا در مطالعه زلزلههای متوالی لازم است زلزله اول به سطوح مشخصی از شدت مقیاس شود. یکی از روش‌های معمول برای مقیاس زلزله اول، حداکثر دریفت به عنوان معیاری از شدت زلزله اول محسوب میشود. روش دیگر استفاده شده در این مقاله شتاب طیف الاستیک به عنوان روشی برای تعیین ضریب مقیاس زلزله اول میباشد. در این مطالعه، احتمال فراگذشت سطوح عملکردی مختلف سیستم سازهای بتن آرمه یک درجه آزادی تحت زلزلههای متوالی با ترکیبات مختلفی از رکوردهای دور از گسل و نزدیک گسل برای هر دو معیار مقیاس مورد بررسی قرار گرفته است. اثرات توالی‌های مختلفی از زلزله‌های دور از گسل و نزدیک گسل برای 8 سناریو شبیه‌سازی شده است. با استفاده از روش مقیاس به شتاب طیف الاستیک احتمال فراگذشت از سطح عملکرد زلزله دوم خصوصاً در حالتی که زلزلههای پالسدار وارد شوند، به سطح خرابی سیستم در زلزله اول و ترتیب توالی رکوردهای دور از گسل و نزدیک گسل وابستگی بیشتری دارد. با اینکه روش مقیاس زلزله اول به دریفت حداکثر روش معمول‌تری به شمار میآید، اما اثرات نوع رکوردهای زلزله‌های متوالی در روش مقیاس به شتاب طیف الاستیک مشخصتر است.

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