Do you want to publish a course? Click here

Effect of the existence of soft story on the seismic response of RC buildings

تأثير وجود الطابق اللين على الإستجابة الزلزالية للأبنية البيتونية المسلحة

1356   1   265   0 ( 0 )
 Publication date 2017
and research's language is العربية
 Created by Shamra Editor




Ask ChatGPT about the research

This research studies the behavior of the soft story in RC structures using static analysis and dynamic analysis, where studying models of RC structures containing soft story where this story results from increased hieght of story than the rest storys, was conducted static analysis using Nonliner pushover analysis and dynamic analysis using Nonliner time history analysis


Artificial intelligence review:
Research summary
يتناول هذا البحث دراسة تأثير وجود الطابق اللين على الاستجابة الزلزالية للأبنية البيتونية المسلحة. الطابق اللين هو الطابق الذي يحتوي على قساوة نسبية أقل من الطوابق التي تعلوه، وهو غالباً ما يكون الطابق الأرضي المفتوح المستخدم كمرآب للسيارات. يتسبب الطابق اللين في ضعف هيكلي يمكن أن يؤدي إلى انهيار المبنى بالكامل أو جعله غير صالح للاستخدام بعد الزلازل. تم تحليل سلوك الأبنية باستخدام طريقتين: التحليل الستاتيكي اللاخطي (طريقة الدفع المتتالي) والتحليل الديناميكي اللاخطي (طريقة السجل الزمني). تم دراسة ستة نماذج لمباني إطارية بيتونية مسلحة بارتفاعات مختلفة، بعضها يحتوي على طابق لين. أظهرت النتائج أن وجود الطابق اللين يحد من قدرة تحمل المنشأ للقوى الجانبية ويزيد من الإزاحات الطابقية، مما يؤدي إلى تلدن الأعمدة في الطابق اللين. توصي الدراسة بضرورة إجراء تحليل ديناميكي في حالة وجود طابق لين لضمان تصميم آمن وفعال.
Critical review
دراسة نقدية: تعتبر هذه الدراسة مهمة لأنها تسلط الضوء على مشكلة شائعة في تصميم الأبنية البيتونية المسلحة، وهي وجود الطابق اللين وتأثيره على الاستجابة الزلزالية. ومع ذلك، يمكن تحسين الدراسة من خلال تضمين تحليل أكثر تفصيلاً للبيانات التجريبية واستخدام نماذج أكثر تنوعاً من الأبنية. كما يمكن أن تكون الدراسة أكثر شمولاً إذا تم تضمين تأثيرات أخرى مثل تأثير المواد المستخدمة في البناء وتوزيع الأحمال. بالإضافة إلى ذلك، يمكن أن يكون من المفيد تضمين توصيات عملية لتحسين تصميم الطوابق اللينة في الأبنية الجديدة أو تعزيز الطوابق اللينة في الأبنية القائمة.
Questions related to the research
  1. ما هو الطابق اللين؟

    الطابق اللين هو الطابق الذي يحتوي على قساوة نسبية أقل من 70% من القساوة النسبية للطابق الذي يعلوه أو أقل من 80% من المتوسط الحسابي للقساوات النسبية للطوابق الثلاثة التي تعلوه.

  2. ما هي طرق التحليل المستخدمة في الدراسة؟

    تم استخدام طريقتين للتحليل: التحليل الستاتيكي اللاخطي (طريقة الدفع المتتالي) والتحليل الديناميكي اللاخطي (طريقة السجل الزمني).

  3. ما هي النتائج الرئيسية للدراسة؟

    أظهرت النتائج أن وجود الطابق اللين يحد من قدرة تحمل المنشأ للقوى الجانبية ويزيد من الإزاحات الطابقية، مما يؤدي إلى تلدن الأعمدة في الطابق اللين.

  4. ما هي التوصيات التي قدمتها الدراسة؟

    توصي الدراسة بضرورة إجراء تحليل ديناميكي في حالة وجود طابق لين لضمان تصميم آمن وفعال.


References used
Applied Technology Council, ATC 40, Seismic Evaluation and Retrofit of Concrete Buildings, Volume 1-2, California, 1996
European Committee of Standardization, EUROCODEurocode-8, Design of Structures for Earthquake Resistance, Belgium, 2000
Federal Emergency Management Agency, FEMA 356, Prestandard and Commentary for the Rehabilitation of Buildings, 2000
rate research

Read More

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.
This paper makes an experimental and analytical investigation of cracks characteristics in Fiber Reinforced Polymer strengthened RC beams under different levels of sustained load and Reinforced ratio. As the equations available for conventional RC b eams are inappropriate for the calculation of the short-term crack width in FRP-strengthened RC beams[8], a statistical analysis is carried out on available test data from international sources [6-9-10] and from the test results obtained in the current study (Concrete Labor- Civil engineering Department- Damascus University-2014) to establish a new equation that considers the effect of the FRP laminates. This equation is a correlation of stress in steel bars, concrete surface tension , and effective side cover. The long-term crack width is then related to the instantaneous crack width by empirical equations which are derived from the test results obtained in the current study.
The aim of this work is to demonstrate the role that slabs plays in RC high-rise buildings. This study shows the mistakes may be done by modeling slabs as rigid diaphragms. Then after, the rehabilitation ability of these systems can be more accurate.
This research includes an experimental study and a nonlinear analysis using the finite element method of reinforced concrete beams with large opening in body that exist in shear zone . The tested beams are simply supported with rectangular section and without additional reinforcement in opening region. The opening is square in shape with variable dimensions and constant distance from the support . Studying the effect of changing length of the opening on the behavior of the reinforced concrete beams was already completed. The modes of cracks , (load-deflection ) relationship, ultimate load and the mode of failure for all beams were determinate . The study showed that existence an opening in shear region of beams reduce the strength of beams and affect on the mode of shear failure , and any addition in the depth of the opening lead to early cracks , more deflections and less ultimate failure load .
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.
comments
Fetching comments Fetching comments
mircosoft-partner

هل ترغب بارسال اشعارات عن اخر التحديثات في شمرا-اكاديميا