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العنوان
Modeling of unreinforced masonry walls for lateral load behavior of R/C infilled frames /
المؤلف
Abdellah, Amr Galal Abdelhamid.
هيئة الاعداد
باحث / عمرو جلال عبدالحميد عبداللاه
مشرف / صلاح الدين السعيد المتولي
مشرف / أحمد محمود يوسف
مناقش / عادل يحيي عقل
مناقش / صلاح الدين السعيد المتولى
مناقش / أحمد محمود يوسف
مناقش / حسن محمد حسن علام
الموضوع
Masonry. Walls. Lateral loads. Foundations.
تاريخ النشر
2019.
عدد الصفحات
120 p. :
اللغة
الإنجليزية
الدرجة
الدكتوراه
التخصص
الهندسة المدنية والإنشائية
الناشر
تاريخ الإجازة
1/10/2019
مكان الإجازة
جامعة المنصورة - كلية الهندسة - الهندسة الانشائية
الفهرس
Only 14 pages are availabe for public view

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Abstract

Studying the structural behavior of unreinforced masonry walls and reinforced concrete (RC) frames with masonry infills subjected to in-plane loading conditions is the main goal of the present work. The behavior is mainly controlled by the complex nonlinear response of the masonry wall panels, the surrounding RC frame, and the contact characteristics between the two components In this thesis, a model for the nonlinear analysis of confined masonry walls is presented as a first step and then integrated as infill in the RC frame structures as a second step. Masonry is a composite material characterized by two different constituent materials, brick and mortar, resulting in an anisotropic material. Therefore, the mechanical behavior of a masonry paanel can be simplified by adopting the homogenization technique. Due to the special arrangement of bricks and mortar, where the major crack pattern (staggered cracks) are formed, the masonry wall can be approximated and treated as an orthotropic material.Although the masonry wall is considered as homogenized and orthotropic material, the different constitutive characteristics of the material in tension and compression regimes and the different non-associative damage behavior in the orthotropic directions create additional computational complexity.To enable acceptable modelling for performing the numerical nonlinear analysis of masonry walls, it is required to define the suitable damage variables, an appropriate damage threshold/ failure criterion, derive the direction and amount of damage evolution (kinetic equation) in tension/ compression regimes, and establish a constitutive relation, which describes with enough accuracy the real stress-strain behavior in the pre-cracked and post-cracked states.Based on experimental results in Page (1981), a ten parameters third degree polynomial was found appropriate and efficient in describing the failure surface of masonry (for two-dimensional plane stress). The proposed failure criterion satisfies closeness, convexity, uniqueness, and avoids singularities. The proposed failure envelop can describe the orthotropic behavior and the biaxial effect, allows the use of continuum damaged mechanics, homogenization, and uses the incremental approach for tension and compression regimes.