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Register a new user"Nonlinear Static Analysis (push-over analysis) and its Applications on the Effect of Improving Soft Soil on Increasing the Performance of Seismic Resistance Concrete Frame"
"طريقة الدفع المتتالي (PUSHOVER ANALYSIS) و تطبيقاتها على أثر تحسين الترب الضعيفة في رفع أداء الإطارات البيتونية المستوية المقاومة للزلازل"
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يتضمن البحث آلية تطبيق الدراسة الستاتيكية اللاخطية على الجمل الإطارية البيتونية المستوية المقاومة للزلازل عبر نمذجة جملة التأسيس (أساس+ تربة) كوسط مرن أي نمذجتها كنوابض مرنة ذات قساوة خطية و دورانية تحت الإطار و مقارنتها مع فرضية نموذج الاستناد الصلب من حيث الانتقالات و التشوهات و شكل توزع القوى و الإجهادات على عناصر الإطار و من ثم بيان أثر تحسين التربة على قساوة جملة التأسيس و على استجابة الإطار للحمولات الجانبية و الاستمرار بعملية تحسين التربة حتى الوصول إلى القساوة المطلوبة و التي تساعد في نقل أداء المنشأ من مستوي أداء منخفض إلى مستوي أداء أعلى مطلوب من المنشأ الوصول إليه وفق استراتيجية التصميم المتبعة و من ثم الخروج بنتائج و توصيات مناسبة.
This research includes the procedures of applying the nonlinear static analysis (pushover analysis) on seismic resistance concrete frame systems by modeling the foundation system (soil + footing) down the structure as an elastic springs and rocking stiffness and comparing them with premise of fixed support in terms of the deformation and displacement, load and stress distribution in frame elements and accordingly clarifying the effect of improving soil on foundation system stiffness and on the responding of frame to lateral loads which helps in moving the structure performance from low level to a higher level that we need from structure to reach following the design strategy that we choose for the structure.
References used
FEMAPublication 273.,1997- "NEHRP GUIDELINES FOR THE SEISMIC REHABILTATION OF BUILDING", Prepared for the, BUILDING SEISMIC SAFETY COUNCIL , Washington, D.C, By the, APPLIED TECHNOLOGY COUNCIL California, With funding by FEDERAL EMERGENCY MANAGEMENT AGENCY, Washington
FEMA Publication 356., 2000 -"PRESTANDARD AND COMMENTARY FOR THE SEISMIC REHABILTATION OF BUILDING"
FEMA 440., 2005 -"IMPROVEMENT OF NONLINEAR STATIC SEISMIC ANALYSIS PROCEDURES",Prepared BY, APPLIED TECHNOLOGY COUNCIL,California, Prepared FOR, FEDERAL EMERGENCY MANAGEMENT AGENCY, Washington
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Pushover method or method of nonlinear static analysis is considered the latest and best way to study and evaluate the buildings under effect of seismic load. The method is based on the study of deformation occurring in the building, formation of pl
astic hinge in elements, in addition to the redistribution of internal forces in building elements under the effect of earthquake loads. Pushover method was applied to evaluate the Model of residential buildings in Latakia suburb Tabiyat, who has designed and implemented before the issuance of the code which earthquake load considered.
First, the dynamic characteristics of the building (Period, and Mode shape) were identified in the cases of modeling 2D (plane) and 3D (spatial). Second, an analysis of the building under earthquake load by Pushover method depending on ETABS Program was conducted. We have got seven side cases push of the building, and have identified the location of plastic hinge in the building elements, and draw a curved capacity for the building, which represents the relationship between base shear force and lateral deflection at the top of the building. It was concluded that the building is a good resistance to the effect of earthquake.
It was concluded with backing the adoption of Pushover method to evaluate existing buildings, and study the dynamic behavior, and the extent of resistance to the effect of earthquake.
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).
In the study, it was customary to consider
each column in the building as a cantilevered element in resisting
the lateral loads.
In this research, we discussed an analytical
study of the seismic behavior of an internal joint, and we improved
the plastic response of the joint after observing the effect of the
concrete encasement to the column’s steel section along the
connection area.
Due to the sensitivity of concrete frames to the lateral displacement especially in the case of tall buildings, it is useful to improve the behavior to resistance the lateral displacement through bracing. Bracing can be used in cases of rehabilitatio
n and increasing the efficiency of existing concrete buildings. Varied shapes of bracing for concrete frames in order to achieve opening for windows and doors in the wall of frames. The research aims to give an idea for designer on the effect of the shape of bracing on the cross section forces generated in the elements of R/C tall buildings frame elements.
The Study was conducted on R/C frame which consist from five spans, and fifteen storeys. It has compared different shapes of metal bracing, which are X, V, K and O. Calculation were based on Program CSI-SAP 2000.
Conducted compared for the storylateral displacement of concrete frame in relation with the bracing shape. It shows that the bracing have large effect to reduce the storey lateral displacement, in the case of the bracing with X and V shape decreased the value of displacement in the last story in ratio 52.38%, in the case of bracing with K and O shape decreased in ratio 23.07%.
Conducted detailed comparison for the value of cross section i.e. Moments, shear and axial forces in beams and columns of first and second floor frame in relationship of bracing shape. It concludes thatX and V bracing have large effect on the concrete tall buildings frame, as well as in the cases of improving the efficiency of existing R/C frame buildings.
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