نوع مقاله : مقاله پژوهشی
عنوان مقاله English
Eccentric braces are lateral load-resistant systems that have high plasticity and suitable stiffness due to the inelastic behavior of the link beam. Urban structures are mainly in the category of intermediate structures. In this category of structures, the force transmission is in the form of shear and bending, and both factors govern the behavior of the structure. Near- fault records have a less effective duration than far- fault records and have one or more long-range impact pulses and high periodicity. In this article, the seismic behavior of these frames under near-fault earthquakes is investigated with the variation of link beam length with the help of the ABAQUS finite element method and Perform 3D software. For this purpose, two dimensional models of EBF with 7- story and considering 3 different eccentricity/length ratio of (1,1/9,2/8) for each frame with different behaviors of link beam are modeled. Finally, by comparing the effect of link beam length on the final behavior of the frames with earthquakes specific frequency content, it’s resulted that by increasing link beam length Parameters such as stiffness and strength of link beam under symmetric cyclic load are reduced and Parameters such as Maximum shear and acceleration of stories in near-fault earthquakes for 7- story frames are decreased and also maximum drift of the frames are proliferated. In addition, the average of total dissipated inelastic energy decreased with the increasing of the link beam length.
کلیدواژهها English