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Register a new userThe Seismic Desgin Using The Equivalent Static Approach For Major Facilities
التحليل الإنشائي للأحمال الزلزالية بطريقة المكافئ الستاتيكي لتصميم المنشآت الهامة
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إبراهيم عطية( باحث )
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تعتمد طريقة المكافئ الستاتيكي للتصميم المقاوم للزلازل كطريقـة مبسـطة لتصـميم المنشـآت ذات المصادر الإشعاعية المحدودة وفق إرشادات الوكالة الدولية للطاقة الذرية، لضـمان الأمـان الكامـل و تجنب الكوارث التي قد تنجم عن أي خلل في التشغيل. و يهدف البحـث عـرض و تطبيـق الطريقـة و مقارنة النتائج بإجراء التحليل الإنشائي باستخدام نظام برمجي للتحليل الديناميكي باعتماد تسجيل لهزة أرضية حقيقية للتحقق من حدود صلاحية الطريقة و المقترحات التي يمكن استنتاجها لضمانات الأمـان في التحليل الإنشائي.
The Seismic design for nuclear facilities has been subject of complex analysis of the type usually performed for nuclear power plants. For the purpose of ensuring seismic safety for nuclear facilities with limited radioactive inventory, a simplified approach was adopted by the IAEA safety guides with emphasis on appropriate construction and detailing principles rather than sophisticated dynamic analysis. This work presents the equivalent static approach, with an application for a frame element, a dynamic analysis is also achieved using a computer program (DRAIN – 2DX) with real (time – history earthquake) for the purpose of comparison, the results lead to some observations and notes which have to be taken into account for the seismic safety design.
References used
(Seismic Design and Qualification for Nuclear Power plants, IAEA Safety Series No 50 – SG – D15 (1992
(Earthquakes and associated topics in relation to Nuclear Power plant Siting, IAEA Safety series No 50 – SG – S1 (1991
(Earthquakes Resistant Design of Nuclear Facilities with limited Radioactive inventory ‘‘ Technical Document issued by International Atomic Energy Agency, VIENNA,(1985
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This paper presents the results of analyzing 17 models with
nonlinear static analysis. The models are 5, 10 and 15-story framewall
structures with Re-entrant corners. The participations of frames
to resist the shear force range between 25% and 60%
.
In the study, it was customary to consider
each column in the building as a cantilevered element in resisting
the lateral loads.
Bridges are important and vital structures that provide communication between
different regions. Due to their importance, their design has had a great attention throughout
the world, as evidenced by the continuous development of seismic design code
s such as
AASHTO, which now adopts the performance-based design, and requires through a set of
requirements and criteria that the bridge performance under the design earthquake is at life
safety (LS) level and thus ensures that it does not collapse. Since most of the local bridges
were built at periods where these criteria were not adopted, it is important to verify their
performance and that they meet these criteria.
In this paper, the seismic performance of an existing bridge, which represents a model
for a wide range of local multi-span simply supported bridges, was evaluated by
developing a 3D model of the bridge using SAP2000V19.1 and applying the nonlinear
static analysis. The results of analysis have been used to verify that the bridge meets the
AASHTO seismic requirements, which include the check of the P-Δ requirement,
displacement demand/ capacity, members (columns) ductility, as well as the check of the
shear demand/capacity of the columns.
The results showed that the performance of the studied bridge under the seismic
intensities adopted in the Syrian code achives the acceptable level which is life safity (LS),
but it exceeds this level under high seismic intensity. The research also showed that there is
compatibility between the results of nonlinear static analysis and AASHTO requirements.
Using Finite Element Analysis (FEA), a comparison between
PushOver Analysis (POA) and Response Spectrum Analysis (RSA)
is done in this research to explore the application limits of POA on
the irregular frame buildings from reinforced concrete.the
comparison contains (failure mechanism, displacement, and
ductility).
The retaining walls are one of most types of engineering constructions and it have
built from natural stones before discovering concrete, Where natural stones have
considered one of the early human materials used in building engineering constructio
ns for
thousands of years, and many facilities in ancient civilization still existing effects so far,
And after the discovery of the concrete and reinforced concrete, the retaining walls which
was built from natural stones diminished relatively
Despite the years this retaining walls has not lost its luster and brilliance, and there
is increased interest in recent years in using new building material which consists of
manufactured stones where used together with traditional construction materials in several
areas both in geotechnical engineering or building … Etc .
This retaining walls present simple technical solutions and it is desirable for aesthetic
reasons and simple implementation and resistance to external conditions,
In addition to being economical solutions limited cost compared to traditional
reinforced concrete retaining walls.
This research deals with the study of the behavior of Segmental Stone Retaining
Walls (SRW) under the static and dynamic loads and parametric study of the most
important factors which influence stability of these retaining walls.
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