تحلیل لرزه‌ای شفت آسانسور ایستگاه مترو با روش شبه استاتیکی

طراحان مترو برای تخمین بار زلزله در سازه‌های زیرزمینی از روابط مربوط به سازه‌های روزمینی نظیر دیوار حائل و پل استفاده می‌کنند ;که با توجه به رفتار متفاوت سازه‌های روزمینی و زیزمینی در برابر زلزله این کار به نوعی محافظه کارانه محسوب می‌شود. بنابراین در این پژوهش ، 9 نمونه شفت آسانسور در نرم‌افزار abaqus به صورت سه بعدی مدلسازی و با استفاده از روش شبه استاتیکی مربوط به تحلیل عددی سازه های زیرزمینی تحلیل شد. سپس کارایی روابط محافظه‌کارانه مربوط به سازه‌های رو‌زمینی، با مدلسازی ،بارگذاری و تحلیل نمونه‌ها در نرم افزار sap2000 مورد بررسی قرار گرفت. نتایج این پژوهش نشان داد که رفتار شفت آسانسور ایستگاه مترو در هنگام زلزله به مانند یک جسم صلب می‌باشد و همچنین مقایسه‌ی‌ نتایج مربوط به مدلسازی و تحلیل شفت آسانسور در نرم افزار sap2000 نشان داد که که رابطه‌ی وود به عنوان رابطه‌ا‌ی مناسب می‌تواند با متوسط خطای حدود %2 لنگرهای خمشی و نیروهای محوری به وجودآمده در شفت آسانسور ایستگاه مترو را پیش‌بینی کند. بنابراین استفاده از این رابطه برای تخمین مقدار بار زلزله در شفت آسانسور ایستگاه مترو قابل توصیه می‌باشد.

seismic analysis of subway station elevator shaft by quasi-staticmethod

to estimate the earthquake load in underground structures, subway designers use the relationships related to surface-mine structures such as retaining walls and bridges, which are considered somewhat conservative due to different behavior of surface-mine and underground structures against earthquakes. therefore, in this research, 9 examples of elevator shafts were three-dimensionally modeled using abaqus software and analyzed by quasi-static method related to the numerical analysis of underground structures. then, the effectiveness of conservative relationships related to above-ground structures was investigated by modeling, loading and analyzing samples in sap2000 software. the results of this research show that the behavior of the elevator shaft of the subway station during an earthquake is like a rigid body. moreover, the comparison of the results of modeling and analysis of the elevator shaft in sap2000 software shows that wood's relationship as a suitable relationship can be used with an average error of about 2% to predict the bending anchors and axial forces generated in the elevator shaft of the metro station. therefore, it is recommended to use this relationship to estimate the amount of earthquake load in the elevator shaft of the metro station.introductionin the past, seismic analysis of underground structures was given less attention by researchers due to the empirical belief that underground structures are safer than above-ground structures against earthquakes. however, following the kobe earthquake in 1995 in japan, extensive damages resulting from this earthquake in metro stations occurred that caused to increase researchers' interest in the topic. the importance of this issue in iran was doubled due to the high seismicity of this country. basically, researchers use several major methods for seismic analysis of underground structures. in the first method, known as the experimental method, researchers consider earthquakes occurred in the past to study the types of damages to underground structures due to earthquakes and the factors caused these damages. dowding and rozen (1978) and owen and scholl (1981) are among the researchers who have used this method for seismic analysis of underground structures.in the second method, known as the laboratory method, researchers try to simulate the behavior of underground structures against earthquake waves by using physical modeling of underground structures and the surrounding soil on a smaller scale in the laboratory environment. among the researchers who have used this method for seismic analysis of underground