Experimental and numerical investigations of foundation vibrations
مقدم أطروحة جامعية
مشرف أطروحة جامعية
Fattah, Muhammad Yusuf
Karim, Husayn Hamid
الجامعة
الجامعة التكنولوجية
الكلية
-
القسم الأكاديمي
قسم هندسة البناء و الإنشاءات
دولة الجامعة
العراق
الدرجة العلمية
دكتوراه
تاريخ الدرجة العلمية
2010
الملخص الإنجليزي
This thesis deals with the dynamic analysis of foundations on fully saturated soil experimentally and numerically by the finite element method.
The numerical analysis involves the displacement-pore fluid pressure formulation of the dynamic consolidation theory to represent the saturated soil under the effect of dynamic loadings of harmonic vertical mode of vibration.
In this thesis, a new model is developed to represent the elasto-plastic behavior of the saturated soil under the dynamic loadings based on the Drucker-Prager plasticity model.
The dilation slope of the plastic potential surface is derived as a function of the angle of internal friction of the soil and it is considered as a constant parameter of the plasticity model, and this assumption is proposed in order to make the material hardening dependent on the angle of friction.
The developed model indicates that the dynamic response of the solid displacement and pore pressure from the elasto-plastic behavior is larger than that assuming elastic behavior of the soil for the same values of the dynamic loadings.
Several methods are available to determine the dynamic response of machine foundations; all of these methods consider the soil under the foundation is dry.
In this work, a small scale footing model is performed to simulate a physical model of machine foundation on saturated soil.
In addition, a numerical model is performed by using the finite element method for the applicability of the theory on the physical model.
The small scale footing model is performed to investigate the amplitude of displacement of rectangular footing on saturated sand under the effect of the harmonic vertical mode of vibration.
The numerical modeling in prototype scale using a three-dimensional formulation is adopted to simulate the physical model.
The results from the numerical model showed that a good agreement is achieved between the predicted dynamic response and the measured response of the physical model.
In this study, a method to model the semi-infinite extension (unbounded domain) of the saturated soil is developed.
In this method, the unbounded domain is replaced by an absorbing layer of finite thickness with properties that appreciably reduce the wave reflection into bounded domain.
In this layer, the soil is represented by the same properties as in the soil close to the foundation (bounded domain) and a model of frequency-dependent damping is implemented.
It found that a decay in wave can be noticed when the unbounded domain of the saturated soil is represented by the energy absorbing layer.
In addition, the maximum displacement of the foundation will be decreased due to using the energy absorbing layer to simulate the unbounded domain in comparison with the elementary boundaries.
The excess pore water pressure that developed during the dynamic loading will be dissipated with time due to using the energy absorbing layer.
التخصصات الرئيسية
الموضوعات
نمط استشهاد جمعية علماء النفس الأمريكية (APA)
al-Wakil, Sad Fayiq Abbas. (2010). Experimental and numerical investigations of foundation vibrations. (Doctoral dissertations Theses and Dissertations Master). University of Technology, Iraq
https://search.emarefa.net/detail/BIM-304999
نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)
al-Wakil, Sad Fayiq Abbas. Experimental and numerical investigations of foundation vibrations. (Doctoral dissertations Theses and Dissertations Master). University of Technology. (2010).
https://search.emarefa.net/detail/BIM-304999
نمط استشهاد الجمعية الطبية الأمريكية (AMA)
al-Wakil, Sad Fayiq Abbas. (2010). Experimental and numerical investigations of foundation vibrations. (Doctoral dissertations Theses and Dissertations Master). University of Technology, Iraq
https://search.emarefa.net/detail/BIM-304999
لغة النص
الإنجليزية
نوع البيانات
رسائل جامعية
رقم السجل
BIM-304999
قاعدة معامل التأثير والاستشهادات المرجعية العربي "ارسيف Arcif"
أضخم قاعدة بيانات عربية للاستشهادات المرجعية للمجلات العلمية المحكمة الصادرة في العالم العربي
تقوم هذه الخدمة بالتحقق من التشابه أو الانتحال في الأبحاث والمقالات العلمية والأطروحات الجامعية والكتب والأبحاث باللغة العربية، وتحديد درجة التشابه أو أصالة الأعمال البحثية وحماية ملكيتها الفكرية. تعرف اكثر