ارزیابی احتمالاتی شکنندگی سازه‌های شبکه قطری دارا و بدون قاب خمشی داخلی و با الگوی هندسی پیرامونی مختلف

نوع مقاله : پژوهشی اصیل (کامل)

نویسندگان
مهیار روشنی 1
افشین مشکوه الدینی 2
علی معصومی 2
1 دانش آموخته
2 هیات علمی دانشکده مهندسی
10.22034/23.3.57
چکیده
مفهوم سازی و پیاده سازی آنالیز شکنندگی، یک رویکرد مناسب به منظور کنترل احتمالاتی رخداد سطوح عملکرد مختلف در اسکلت‌های مقاوم سازه ای است. هدف از این پژوهش، ارزیابی تاثیر چیدمان قاب خمشی داخلی پلان بر عملکرد لرزه‌ای سازه‌های شبکه قطری با زوایای پیکربندی محیطی مختلف، بر پایه روابط شکنندگی می‌باشد. بدین ترتیب، سه سازه 24 طبقه شبکه قطری با زوایای المان مورب پیرامونی 49، 67 و 74 درجه به دو صورت دارا و بدون قاب خمشی داخلی پلان، طراحی شد. با انجام تحلیل‌های تاریخچه زمانی غیرخطی و دینامیکی فزاینده (IDA)، شکل‌پذیری و ظرفیت مقاومت سازه‌های مطالعاتی تحت رکوردهای حوزه نزدیک حاوی موجک‌های پرانرژی، مورد بررسی قرار گرفت. سپس، نمودار‌های شکنندگی سازه‌های شبکه قطری، بر اساس توزیع آماری لوگ-نرمال برای چهار وضعیت عملکرد لرزه‌ای، محاسبه شد. مطابق با نتایج حاصله، پیکربندی هندسی محیطی با زوایای 49 درجه، بیشترین سطح اطمینان را در برابر رخداد سطوح عملکرد لرزه‌ای برای سازه‌های شبکه قطری ایجاد می‌کند. نمودار‌های شکنندگی نشان دادند که روند خرابی کلی در سازه‌های شبکه قطری بدون قاب خمشی داخلی با آهنگ سریع‌تری نسبت به سازه‌های هم‌پایه دارای قاب خمشی پدیدار می‌شود. بر پایه ارزیابی آسیب‌پذیری سازه‌های مطالعاتی، اندازه و دامنه تاثیرگذاری چیدمان قاب­های خمشی داخلی پلان بر بهبود و کاهش نسبی دامنه رفتار غیرخطی سازه‌های شبکه قطری، وابسته به زوایای المان مورب الگوی مثلثی پیرامونی است. دراین‌باره نیز تعبیه زوایای بزرگ پیکربندی محیطی، میزان اثر بخشی چیدمان قاب خمشی داخلی بر جلوگیری از وقوع ناپایداری کلی دینامیکی (GI) در سازه‌های شبکه قطری را افزایش می‌دهد. جایگزینی و چیدمان قاب­های خمشی در بخش میانی پلان سازه سبب افزایش کارآمدی مکانیزم استهلاک انرژی زلزله در ساختارهای شبکه قطری می‌گردد.

کلیدواژه‌ها

موضوعات

عنوان مقاله English

Probabilistic Evaluation of the Fragility of Diagrid Structures with and without Internal Moment Frames and Various Perimeter Geometric Configurations

نویسندگان English

M. Roshani 1
A. Meshkat-Dini 2
A. Massumi 2
1 Graduate in Earthquake engineering
2 Assistant Professor
چکیده English

The evaluation of the fragility functions is an analytical approach that allows different ground motions to be used at varying intensity levels and represent various characteristics of low-intensity and high-intensity shakings. The fragility curves demonstrate the structure’s probability of collapse, or other limit states, as a function of some ground motion intensity measures (IM). The intensity measure is often quantified by spectral acceleration (Sa) or peak ground acceleration (PGA). Based on the statistical procedures, the parameters of the fragility functions are computed by assessing the results of nonlinear dynamic time history analyses. Therefore, the probability of failure associated with a prescribed criterion (e.g. the maximum inter-story drift) is estimated based on the probabilistic distribution relations.

This paper evaluates the effects of internal flexural frames on the seismic performance of diagrid structures based on fragility curves. This evaluation is achieved by designing a group of 24-story studied diagrid models with various diagonal angles of 49, 67, and 74 according to the Iranian Standard No. 2800 (4th edition) and the Iranian National Building Code (Steel Structures-Issue 10). Then, some specific interior gravity frames of the studied diagrid models are replaced with bending frames. The seismic vulnerability of the studied diagrid structures with and without internal bending frames is assessed using nonlinear time history and incremental dynamic analyses (IDA) under near-field earthquake records containing different directivity effects. Finally, the fragility curves for the studied structures were obtained based on the lognormal probabilistic distribution function for the seismic performance limit states including IO, LS, CP, and global instability (GI). Moreover, the seismic performance levels of the studied structures were determined based on the FEMA 356.

The results of performed nonlinear time history analyses indicate that the application of internal bending frames in diagrid structures would reduce the value of inter-story drift in upper floor levels, especially when the angles of exterior diagonal members are large. The results also show that the global instability of diagrid structures without internal bending frames can occur at a faster rate than the skeletal models with internal bents. Also, the contribution of the internal bending frames in improving the nonlinear behavior of diagrid structures depends on the perimeter triangular patterns. Due to this dependency, the increase in the angle of the inclined members in skeletal geometric configuration can increase the effectiveness of the internal bending frames in preventing the occurrence of global dynamic instability. The fragility curves of the studied diagrid structures illustrate that the internal bending frames reduce potentially excessive seismic performance levels. Furthermore, the internal bending frames amplify the seismic energy dissipation capability of the diagrid structures.

کلیدواژه‌ها English

Diagrid Structure
Fragility Curve
Incremental dynamic analysis
collapse
Seismic Performance Level
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مهندسی عمران مدرس
دوره 23، شماره 3
مرداد و شهریور 1402
صفحه 57-75