8044

7479

كارشناسي ارشد

سازه

اصفهان: دانشگاه صنعتي اصفهان، دانشكده عمران

1391

ده،134ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

محمدرضا افتخار

داود مستوفي نژاد

30/7/92

محمد مهدي سعادتپور، مرتضي مدح خوان

مهندسي عمران

ID7479

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Strengthening Masonry Walls by FRP with Strut and Tie Modeling Ali Vahabi a vahabi@cv iut ac ir April Civil Engineering Department Isfahan University of Technology Isfahan Iran Degree M Sc Language Farsi Supervisor M M Eftekhar eft@cc iut ac ir Abstract Masonry structures constitute a large percentage of the current buildings in most countries around the world The recent earthquake in different countries of the world such as those in Iran Algeria India Turkey have shown particularly masonry walls were damaged Thus masonry walls are the most vulnerable elements of buildings when subjected to earthquake loading Therefore it is necessary to find practical solutions by study the behavior of these walls first without and then with retrofitting under monotonic loading Recent earthquakes have clearly demonstrated that the development of effective and affordable strategies for the strengthening of masonry is urgently needed As a response to these challenges fiber reinforced polymer FRP composites may offer technically and economically viable solutions Studies on the use of fiber reinforced polymers FRP as strengthening materials of masonry walls have been numerous In this study a variety of modeling methods are briefly described and a fast and efficient method is presented for solving the finite element masonry walls The model used in this study is Concrete Damage Plasticity in ABAQUS software This model is one of the macro modeling techniques in masonry modeling Macro models assuming homogeneity of isotopic material due to its simplicity and saving time for solution are important In addition to the modeling of unreinforced masonry walls URM cohesive elements are used for modeling the behavior of masonry walls strengthened with FRP composite strips The results showed acceptable coincidence between modeling results and experimental results of other researchers FRP materials particularly in the form of unidirectional strips provide a highly effective method of structural intervention in masonry walls However the selection of the reinforcing pattern positioning of the strips still remains a problem Usually in traditional technique have been used horizontal and diagonal FRP strips for strengthening of masonry walls This study obtains the new pattern of FRP strips for strengthening masonry walls under monotonic loading with using of topology optimization and struts and tie model This methodology has been implemented in a computer program that enables the definition of the locations where FRP strips should be placed in masonry walls subjected to in plane loading Results showed that the new pattern used in this study had more load capacity and ductility in comparison with traditional pattern such as horizontal and diagonal pattern Key words Unreinforced masonry wall URM Reinforced masonry wall FRP strips Monotonic loading Strut and tie model Topology optimization new pattern of FRP strips PDF created with pdfFactory trial version www pdffactory com

محمدرضا افتخار

داود مستوفي نژاد

محمد مهدي سعادتپور، مرتضي مدح خوان