پاسخ سیستم‌های خاک- سازه به پالس‌های ناشی از جهت‌گیری پیشرونده‌ی انتشار شکست در نواحی نزدیک گسل

نویسندگان
چکیده
در این مطالعه آثار ترکیبی اندرکنش خاک-سازه و زلزله‌های نزدیک گسل بر پاسخ ارتجاعی سازه‌های یک درجه‌آزادی سیستم خاک-سازه تحت اثر پالس‌های ناشی از جهت‌گیری پیش‌رونده انتشار شکست به عنوان نماینده‌ی خصوصیات سینماتیکی زلزله‌های حوزه‌ی نزدیک گسل، بررسی شده است. نحوه‌ی تغییرات مقاومت تقاضای ارتجاعی سازه بر حسب محدوده‌ی وسیعی از پارامترهای بی‌بعد که معرف آثار اندرکنش خاک- سازه و نزدیک گسل است، ارائه می‌شود. برای ارزیابی آثار خاک بر پاسخ ارتجاعی سازه‌ها در اثر زلزله‌های نزدیک گسل، پاسخ سازه‌ی مستقر بر بستر صلب نیز براورد شده و با نتایج سازه‌ی مستقر بر بستر خاک مقایسه می‌شود.

کلیدواژه‌ها


عنوان مقاله English

Response of Soil-Structure Systems Subjected to Forward Rupture Directivity Pulses

نویسندگان English

Z. Azarhoosh
G. R. Ghodrati Amiri
H.R. Razeghi
چکیده English

The combined effects of two major contributing factors, i.e. inertial soil-structure interaction
(SSI) and near-fault ground motions, on structural responses were studied. Considering nearfault
characteristics, soil-structure systems are subjected to both actual near-fault ground
motion records and their dominant kinematic characteristics, i.e. forward rupture-directivity
pulses, coherently travelling waves seen as a large amplitude and short duration pulse-type
motion at the beginning of each fault-normal component of the record. As a result of the
suitability of forward rupture-directivity pulses for quantifying the salient response features of
structures, a mathematical model, proposed by Makris, was used to represent the forward
rupture-directivity pulse-type motions. Using a comprehensive parametric study, the structure,
a bilinear single degree of freedom (SDOF) system, the soil beneath the structure and a
homogeneous elastic half-space were combined based on a discrete model to constitute the
overall soil-structure model. The results have been presented in the form of elastic strength
demand graphs for a wide range of non-dimensional key parameters, which describe the SSI
effects. Both the soil-structure systems and the corresponding fixed-base structures were
considered and compared. Using numerical time-stepping analyses, it was found that the
response of soil-structure systems subjected to actual near-fault records is similar to those
subjected to forward rupture-directivity pulses. Consequently, the forward rupture-directivity
pulses can be used to predict the salient response features of soil-structure systems in
seismically active regions. They can also be a realistic representation of near-fault ground
motions for predicting the response of long-period structures. It was further observed that
quite interestingly, the response of soil-structure systems subjected to actual near-fault
records, has two maximum regions. However, it was recognized that further study would be
required to clarify these regions. The results also indicated that considering SSI is critical for
a variety of structures. Accordingly, underestimated near-fault responses could be obtained
when the SSI effects are ignored.

کلیدواژه‌ها English

Soil-Structure Interaction
Near-Fault ground motions
Forward rupturedirectivity pulses
Elastic Response of Structures
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