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Register a new userApplication Limits of Nonlinear Static PushOver Analysis for Reinforced Concrete Irregular Frame Buildings
حدود تطبيق التحليل اللاخطي الستاتيكي بالدفع المتزايد على الأبنية الاطارية غير المنتظمة من البيتون المسلح
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Aِl-Baath University ورقة بحثية
Publication date
2016
fields
Structural Engineering
and research's language is
العربية
Created by
Shamra Editor
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تم في هذا البحث و باستعمال طريقة العناصر المحدودة Finite Element Analysis, المقارنة بين طريقتي الدفع المتزايد و التحليل الديناميكي باستعمال طيف الاستجابة Response Spectrum Analysis, RSA على نماذج من المنشآت الاطارية غير منتظمة من البيتون المسلح، لمعرفة حدود تطبيق طريقة الدفع المتزايد على هذه المنشآت، حيث تمت المقارنة من حيث تشكل ميكانيزم الانهيار و الانتقالات و درجة المطاوعة.
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).
References used
Abd- Alla. Mohammed. Application of recent techniques of pushover for evaluating seismic performance of multistory buildings ,PhD thesis, Cairo University, Egypt,2007,109
ATC-40.Seismic evaluation and Retrofit of Concrete Building . Applied Technology Council , Redwood City ,California , USA,1996
BS EN 1998-2: Eurocode 8: Design Of Structures For Earthquake Resistance –Part2: Bridges . Brussels, CEN, 2005
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In the study, it was customary to consider
each column in the building as a cantilevered element in resisting
the lateral loads.
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 this paper the effect of the distinctive properties of Shape Memory Alloy (SMA)
―the ability to undergo large deformation and restore it after stress removal‖ has been
studied to see to what degree it may affect the structural performance of mul
ti-storey tall
buildings.
Using ANSYS software, two 3D Finite Element (FE) models are built for a
composite multi-storey building (20 story) which is resistant to lateral loads by bracing
system. One of them is with steel bracing and the other is with SMA bracing. Both models
take into account nonlinear material properties of elements and geometric nonlinearity.
The model with SMA material shows improved performance compared with the
model of steel bracing in terms of residual deformations and ductile performance.
This study has provided an accurate description of the traditional nonlinear
static analysis and modal pushover analysis and then these two analyzes
applied for a set of concrete buildings.
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.
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