مقایسه عملکرد لرزه‌ای ساختمان‌های کوتاه و بلندمرتبه بتن‌مسلح نامنظم مجهز به جداساز لرزه‌ای تحت زلزله‌های حوزه نزدیک

ساجدی, سیدفتح اله; حقیقت, جمیل

doi:10.30478/jcsm.2024.422963.1349

مقایسه عملکرد لرزه‌ای ساختمان‌های کوتاه و بلندمرتبه بتن‌مسلح نامنظم مجهز به جداساز لرزه‌ای تحت زلزله‌های حوزه نزدیک

نوع مقاله : مقاله پژوهشی

نویسندگان

سیدفتح اله ساجدی ¹

جمیل حقیقت ²

¹ استاد، گروه عمران، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

² دانش‎آموخته کارشناسی ارشد سازه، گروه عمران، موسسه آموزش عالی جهاد دانشگاهی استان خوزستان، اهواز، ایران

10.30478/jcsm.2024.422963.1349

چکیده

ساختمان‌های سه‌بعدی بتن‌مسلح 5 و 12 طبقه کوتاه و بلندمرتبه با سیستم بـاربر جـانبی قاب خمشی ویژه و دیوار برشی در حالات منظم و نامنظمی‌های مجزا و همزمان در پلان و ارتفاع، با کاربری مسکونی در تهران بر خاک نوع II بررسی شدند. پس از طراحی مدل‌ها با نرم‌افزار ETABS 2015، در تراز پایه آنها جداساز اصطکاکی آونگی طراحی شد و رفتار لرزه‌ای مدل‌ها در حالات گیردار و جداسازی‌شده در پایه، تحت 7 رکورد شتابنگاشت‌ حوزه نزدیک با تحلیل دینامیکی تاریخچه زمانی غیرخطی بررسی شدند. نوآوری پژوهش، بررسی همزمان اثرات نامنظمی، جداساز لرزه‌ای و مؤلفه‌های افقی و قائم گسل نزدیک بر عملکرد ساختمان‌ها با نرم‌افزار OpenSEES 2.5.0 می‌باشد. با وجود جداساز، مدل‌‌های مذکور مانند جسم صلب جابجایی جانبی داشتند. بیشینه نسبت جابجایی نسبی طبقات در مدل‌های بلند نسبت به مدل‌های کوتاه، کاهش بیشتری داشتند؛ در مدل‌های بلند گیردار جداسازی‌شده، در امتداد محورهای X و Y به‌ترتیب %(3/88-1/79) و %(8/83-7/66) و در مدل‌های کوتاه %(89-75) و %(5/82-50) بود. کاهش برش پایه نسبت به حالت گیردار، در مدل‌های کوتاه جداسازی‌شده %(88-63) و در مدل‌های بلند %(77-47) بود. بیشترین اختلاف جذب انرژی مدل‌های کوتاه جداسازی‌شده نسبت به حالت گیردار، مربوط به مدل با نامنظمی همزمان در پلان و ارتفاع، در امتداد محور X به میزان kJ 135 بود؛ این مقدار در مدل‌ بلند نامنظم با %36/18 کاهش در سطح پلان در امتداد محور X، kJ 200 بود. جذب انرژی دیگر مدل‌های بلند جداسازی‌شده نسبت به حالت گیردار کمتر بود؛ بنابراین، کاربرد جداساز اصطکاکی آونگی در مدل‌های بلند در حوزه نزدیک گسل توصیه نمی‌شود.

کلیدواژه‌ها

عملکرد لرزه ای

جداساز

حوزه نزدیک

جابحایی جانبی

جذب انرژی

موضوعات

تعمیر، تقویت، بهسازی و نگهداری سازه‌های بتنی

عنوان مقاله English

Comparison of seismic performance of short and high-rise buildings of irregular reinforced concrete equipped with seismic isolators under near-field earthquakes

نویسندگان English

Seyed Fathollah Sajedi ¹

Jamil Haghighat ²

¹ Professor, Department of Civil Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran

² MSc in Structures, Department of Civil Engineering, Higher Education Institute of Jihad University, Khuzestan Province, Ahvaz, Iran

چکیده English

3D RC’s of 5 and 12 stories, with a special bending frame lateral load-bearing system and shear wall in regular states and separate and simultaneous irregularities in plan and height, were investigated. After designing the models with ETABS 2015, a pendulum friction isolator was designed at their base level, and the seismic behavior in clamped and isolated states at the base was investigated under 7 near-field accelerometer records with nonlinear THDA. The research novelty is the simultaneous investigation of the effects of irregularity, seismic isolator, and horizontal and vertical components of the nearby fault on the performance of buildings with OpenSEES 2.5.0. The models had lateral displacement like a rigid body. The maximum floor drift ratio in long models was more reduced than in short models; In the isolated long models, along X and Y axes, were (79.1-88.3)% and (7.66-83.8)%, and in short models, (75-89)% and (50-82.5)%, respectively. The reduction of the base shear than the clamped state was (63-88)% in short isolated and (47-77)% in long models. The biggest difference in energy absorption (EA) of the isolated short models than the fixed state, related to the model with simultaneous irregularity in plan and height, along the X axis, was 135 kJ; it was 200 kJ in the long irregular model with 18.36% reduction in plan level along x-axis. The EA of other isolated long models was lower than the clamped mode; the use of pendulum friction isolator in long models in the area near the fault is not recommended.

کلیدواژه‌ها English

Seismic performance

Isolator

Near field

Drift

Energy absorption

[1] Habibi, A; Jami, E; Rostami, S, "Evaluation of the relationship between seismic parameters of far and near fault areas using the concept of correlation", Omran Sharif Scientific and Research Journal, Vol. 32-2, No. 2-3, pp. 133-144, 2016 [In Persian].

[2] Azhideh, A; Sharafi, H, "Study of the effect of seismic behaviour near and far from faults on irregular concrete buildings", 3^rd International Congress of Civil Engineering, Architecture and Urban Development, Iran (Tehran), 25 August, 2015 [In Persian].

[3] Azhideh, A; Sharafi, H, "Effect of vertical seismic component on concrete structures", 5^th National Concrete Conference of Iran, Iran (Tehran), 15 October, 2013 [In Persian].

[4] Habibi, A; Jami, E; Rostami, S, "Improving the Application of Foundation Separators using Genetic Algorithm", Amirkabir Journal, Vol. 44, No. 2, pp. 95-107, 2012 [In Persian].

[5] Guide to design and implementation of seismic isolation systems in buildings, Journal No. 523, 2010 [In Persian].

[6] Suthar, A; Noval, R, "Seismic Response of Symmetrical and Asymmetrical Structure with Base Isolators", International Journal for Scientific Research & Developmen, Vol. 5, No. 09, pp. 294-297, 2017.

[7] Mazza, F, Mazza, M, Vulcano, A, “Base-isolation systems for the seismic retrofitting of RC framed buildings with soft-storey subjected to near-fault earthquakes", Journal of Soil Dynamics and Earthquake Engineering, Vol. 109, pp. 209-221, 2018.

[8] Irwan, R; Sjahril A; Yuskar, L; Hendro, Y, "Comparative Analysis of Fixed base and Isolated Structure in L Shape Plan with Time History Analysis based on ASCE7-16," IOP Conf. Series: Materials Science and Engineering 473, 2019.

[9] Saffari, H; Maleki, P; Mortazavi,A Asghar, " Investigation of Combined Steel-Concrete Structures with Inter-Story Seismic Isolator in Near-Fault Field", Iranian Society of Structural Engineering Research, Vol. 7, No. 3, pp. 148-164, 2018 [In Persian].

[10] Noroozinajad Farsangi, E, "Seismic Fragility Estimation of Base Isolated Non-Ductile RC Buildings under Orthogonal Seismic Excitations", Journal of Structural and Construction Engineering, Vol. 8, No. 12, pp. 102-121, 2022 [In Persian].

[11] S. Bandyopadhyay, Y.M. Parulekar, A. Sengupta, J. Chattopadhyay, “Structure soil structure interaction of conventional and base-isolated building subjected to real earthquake”, Structures, Vol. 32, 2021, pp.474-493.

[12] Kheyroddin, A; Aramesh, S, Structural resistant system in tall buildings, 2015 [In Persian].

[13] Foroughi Moghaddam, SMJ, The most complete OpenSEES application reference, Tehran: Knowledge Writer, 2016 [In Persian].

[14] Ministry of Housing and Urban Development, Deputy Minister of Housing and Construction, National Building Regulations of Iran, Issue 6, 2019 [In Persian].

[15] Earthquake Design Regulations (2800), Fourth Edition (2013) [In Persian].

[16] Ministry of Housing and Urban Development, Deputy Minister of Housing and Construction, National Building Regulations of Iran, Article 9, 2020 [In Persian].

[17] Naeim, F, Kelly, JM, “Design of Seismic Isolated Structures from Theory to Practice”, John Wiley & Sons, INC., 1999.

[18] UBC 97, Uniform Building Code, 1997.

[19] Kelly, JM, (1986). "A seismic Base Isolation: Review and Bibliography", Soil Dynamics and Earthquake Engineering, pp. 2-16.

[20] Becker, TC, Yamamoto, S, Hamaguchi, H, Higashino, M, Nakashima, M, “Application of isolation to high-rise buildings: A Japanese design case study through a US design code lens”, Earthquake Spectra, 2014.

[21] Mazza, F, “Seismic demand of base-isolated irregular structures subjected to pulse-type earthquakes.” Journal of Soil Dynamics and Earthquake Engineering, Vol. 108, pp. 111-129, 2018.

[22] Karabork, T, Deneme, IO, Bilgehan, RP, “A comparison of the effect of SSI on base isolation systems and fixed-base structures for soft soil”, Geomechanics and Engineering, Vol. 7, pp. 87-103, 2014.

[23] Bazrafshan, A; Khaji, N, "Seismic response of tall buildings isolated due to long period movements of the earth", Imran Modarres, Vol. 16, No. 2, pp. 42-51, 2016 [In Persian].