Study of unreinforced masonry elements strengthened with engineered cementitious composites under impact loading
سال انتشار: 1403
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 39
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شناسه ملی سند علمی:
JR_IJNAA-15-6_023
تاریخ نمایه سازی: 17 اردیبهشت 1403
چکیده مقاله:
Given the brittle behavior and low flexibility of unreinforced masonry walls, using flexible fiber-reinforced concretes, such as engineered cementitious composites (ECCs), to retrofit them is of great importance. In this regard, the performance of these materials (as a reinforcement layer of unreinforced masonry walls) in improving their behavior (flexibility and strength) against dynamic loads, especially impact loads, should be taken into account. The present study evaluates and compares the vertical middle displacement, energy, and distribution of plastic strains in unreinforced masonry materials, under two conditions, i.e., non-retrofitted and retrofitted with a one-side cover (in the lower surface of the specimen) or two-side cover of ECC layers under dynamic impact loading, through nonlinear dynamic impact analysis. The ECC reinforcement layers in two-side covers were investigated by changing their location (in the middle or edges of the lower surfaces of the specimen), connection type (disconnection or full connection) of the one-side cover of the bottom of the specimen with the ECC reinforcement layer and elastic modulus (from ۱۵ GPa to ۲۲.۵ GPa). The retrofitting of the unreinforced masonry materials with ECC layers (especially with two-side cover) improved their behavior against out-plane impact loads, dissipated energy, and reduced the plastic strains and cracks.
کلیدواژه ها:
Unreinforced masonry wall ، engineered cementitious composite (ECC) ، reinforcement layer ، out of plane impact load ، finite element method ، Abaqus software
نویسندگان
Seyedmohammad Amini
Department of Civil Engineering, Taft Branch, Islamic Azad University, Yazd, Iran
Alireza Mirjalili
Department of Civil Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran
Mohammadreza Javaheri
Department of Civil engineering, Taft Branch, Islamic Azad University, Yazd, Iran
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