An Analytical Approach for Assessment of Masonry Elements Retrofitted by FRP
کلمات کلیدی:
masonry, homogenization, Fiber Reinforced Polymers, damageچکیده
A large number of unreinforced masonry (URM) buildings in the world are seismically vulnerable by today’s standards. The failures and damages reported in recent earthquakes attest to the need for efficient strengthening procedures. In order to preserve these buildings, rehabilitation is often considered essential to maintain their capability and to increase safety. In the last decade, fiber reinforced polymer (FRP) composites have been used for strengthening URM walls of masonry buildings. This paper contributes to the assessment of axial response of masonry units as a periodic arrangement of bricks and mortar, strengthened by FRP. For this purpose a homogenization procedure is developed for a three dimensional repetitive cell, considering the damage of bricks and mortar, but FRP modeled by linear elastic behavior. By considering damage of bricks and mortar, some important characteristics of masonry such as homogenized elastic properties and evaluating of total strength of masonry unit retrofitted by FRP were performed. This simplified homogenization method is able to precisely show behavior of masonry units when perfect bond assumed between FRP and masonry. Following this procedure, experimental works can substitute by numerical analysis as efficient and inexpensive tool. Strengthening of existing basic cell carried out by different patterns of on layer carbon fiber reinforced polymer (CFRP) strips. Finally, behavior of repetitive cell under axial loading estimated by finite element software ABAQUS and the accuracy of the proposed method investigated.
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مراجع
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