نگرش تحلیلی بر تأثیر هندسه و پیکربندی موضعی سازه‌های شبکه قطری بر مؤلفه استحکام تاب‌آوری لرزه‌ای

مقالات آماده انتشار
نویسندگان
مریم خلجزاده 1
صفورا مرشد شکرچی 2
افشین مشکوه الدینی 3
علی معصومی 3
1 دانش‌آموخته کارشناسی ارشد مهندسی زلزله، دانشگاه خوارزمی، تهران
2 دانشجوی دکتری مهندسی سازه،دانشگاه خوارزمی، تهران
3 هیات علمی،دانشگاه خوارزمی،دانشکده فنی و مهندسی، تهران
10.48311/mcej.2026.24047
چکیده
سازه شبکه قطری به‌عنوان یک ساختار تعمیم‌یافته بر پایه قاب خمشی محیطی و به دلیل ماهیت معماری و قابلیت پیکربندی، در ساخت سازه‌های بلند مرتبه مورد توجه مهندسان طراح قرار گرفته است. امکان کاهش مصالح مصرفی در حذف ستون‌های عمودی و کاربرد شبکه اعضای قطری، نمونه‌ای از کارایی ساختاری این سازه‌ها است. پارامترهای رفتار لرزه­ای این سازه متأثر از زاویه پیکربندی و ظرفیت محوری اعضای قطری می­باشد. اعضای قطری نیز با حاکمیت عملکرد محوری در برابر بارهای جانبی ناشی از باد و زلزله مقاومت کرده و نقش اساسی در محدود نمودن دامنه رفتار ناکشسان و کاهش روند تشکیل و گسترش حوزه‌های غیرخطی دارند. شایان ذکر است که به علت نبود ضوابط طراحی یکپارچه برای سازه ­های شبکه قطری، ضرورت انجام پژوهش‌های گسترده­ در زمینه تدوین معیارهای جامع و مؤثر در برآورد پارامترهای سختی و مقاومت، برقراری پایداری دینامیکی و چگونگی تغییرات تاب‌آوری این سازه‌ها در برابر بارهای دینامیکی ناشی از باد و زلزله، ملاحظه می‌شود. در این پژوهش، عملکرد لرزه‌ای سه سازه هم ­ساختار شبکه قطری با بلندای 20 طبقه تحت مجموعه‌ای از رکوردهای حوزه نزدیک ارزیابی گردیده است. دیدگاه خاص این پژوهش در ارزیابی میزان تأثیرگذاری هندسه و پیکربندی اسکلت مقاوم در طبقه همکف و بخش ورودی سازه، بر روی پارامترهای مشخصه رفتاری است. یک مطالعه تحلیلی بر روی پارامتر پاسخ دریفت، نتایج تحلیل دینامیکی فزاینده IDA ، نمودار­های شکنندگی و مؤلفه تاب‌آوری لرزه‌ای تحت رکوردهای انتخابی صورت گرفته است. نتایج و آورده‌های تحلیلی این پژوهش، نشان از همگرایی نسبی و همخوانی به نسبت نزدیک میان ویژگی‌های رفتاری هر سه سازه مطالعاتی دارد. پاره­ ای تفاوت­های نسبی نیز به سبب تعبیه ورودی با ساختار هندسی متفاوت در مشخصه­ های رفتاری سازه ­های مطالعاتی ملاحظه می­شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله English

Analytical Evaluation of the Effect of Geometry and Local Configuration of Diagrid Structures on the Robustness Component of Seismic Resilience

نویسندگان English

Maryam Khalajzadeh 1
Safoora Morshed-Shekarchi 2
Afshin Meshkat-Dini 3
Ali Massumi 3
1 Kharazmi University
2 Kharazmi University
3 Kharazmi University
چکیده English

Diagrid structure is an extended resistant skeleton based on framed tube system which has been considered in high-rise buildings constructions due to its architectural aesthetics and configurational character. These general characteristics are demonstrated by reducing the consuming materials through removing columns and the application of a grid configuration of diagonal elements. The seismic behaviour of such a structure is affected by the configuration angle and the axial capacity of the diagonal members. With the dominance of axial function, the diagonal elements also resist lateral loads caused by wind and earthquake, and also play a key role in limiting the amplitude of inelastic behaviour. Therefore, the seismic performance of diagonal elements would reduce the process of formation and expansion of nonlinear zones in diagrid structures. According to the lack of guiding principles for the integrated design of diagrid structures, there is a high demand for extensive researches in collecting comprehensive and effective criteria for estimating stiffness and strength parameters, establishing dynamic stability and understanding how the resilience of these structures change due to dynamic loads caused by wind and earthquake.

In this study, the seismic performance of three 20-story studied diagrid buildings with the same structural system under a set of near-field records has been evaluated. The particular focus of this study is on evaluating the effect of the geometry and configuration of the resistant skeleton in the ground floor and the entrance section on the behavioural characteristics. In this paper, an analytical study has been run on the drift response parameter, the results of incremental dynamic analysis (IDA), fragility curve and the seismic resilience component under the selected earthquake records. The analytical results of this study show a close convergence between the behavioural characteristics of all three studied structures.

کلیدواژه‌ها English

Diagrid Structure
Structural Configuration
Near-field Record
incremental dynamic analysis (IDA)
Fragility Curve
Seismic Resilience
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