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Numerical evaluation of the hysteretic behavior of concentrically braced frames and buckling restrained brace frame systems ارزیابی عددی رفتار هیسترتیک سیستم های قاب های مهاربندی همگرا و قاب مهاربندی کمانش تاب Mohammad Naghavia,⁎, Rohola Rahnavardb,⁎, Robert J. Thomasb,⁎, Mohsen Malekinejadc a Department of Civil Engineering, Javid Institute for Higher Education of Jiroft, Iran b Department of Civil and Environmental Engineering, Clarkson University, Potsdam, NY, USA c Department of Civil Engineering, Islamic Azad University, Sirjan branch, Iran This paper presents a numerical investigation of buckling restrained brace (BRB) frames (BRBF) and a comparison with concentrically braced frames (CBF). A simplified core-spring finite element model was used to model BRB elements. Four types of CBF (X, V, inverted V, and two-story X) and four types of BRBF (diagonal, V, inverted V, and two-story X) were modeled in ABAQUS. A static nonlinear pushover analysis considering two cyclic loading protocols showed that the buckling restraint allows the BRB elements to undergo significant plasticity without forming plastic hinges, thereby dissipating a proportionally larger amount of energy and delaying yielding in the frame elements. Results indicated dramatic improvements in energy dissipation and ductility in BRBF models as compared to equivalent CBF models. Seismic response modification factors for BRBF models also showed greater values over CBF models. Time-history analysis evaluated the performance of CBF and BRBF under historical earthquake loadings and supported the same conclusions. The best performance was observed for V, inverted V, and two-story X BRBF configurations; the diagonal BRBF configuration performed better than equivalent CBF models, but did not perform nearly as well as the other BRBF models. منبع article_Numerical_evaluation_of.pdf

COMPARE THE BEHAVIOR FACTOR OF THE ULTIMATE RESISTANCE OF MOMENT FRAME, PLAIN AND PERFORATED STEEL PLATE SHEAR WALLS AND BUCKLING RESTRAINED BRACE AS YIELDING METAL DAMPER ABSTRACT: Steel moment frame systems, steel plate shear walls and also buckling restrained brace (BRB) are considered as the most widely used seismic resistant systems of the world. Firstly, in this research, in order to validate the finite element models, the tested sample of steel plate shear walls of 4 floors at the University of Alberta, Canada, and the tested sample of buckling restrained brace at the University of Berkeley California, with the software ABAQUS 6.10-1 were used. Then, the obtained results of the test and analysis have been compared. The confirmed models have been used for the analysis of two-dimensional frame of plain and perforated steel plate shear walls with a regular pattern of positing holes in the screen, buckling restrained brace and moment frame of 4 floors. منبع دانلود COMPARE THE BEHAVIOR.pdf

طراحی و مدلسازی مهاربندهای کمانش تاب در نرم افزار ETABS 2015 فایل پی دی اف در 13 صفحه تهیه شده توسط شرکت مهندسی و عمران آلتین یول تبریز در یک فایل پی دی اف 15 صفحه ای دیگر هم توضیحات کلی در مورد این مهاربندها ارایه شده است و به مواردی مثل اجزای تشکیل دهنده ، مزایا و معایب و موارد کاربرد آنها اشاره شده است. منبع: [Hidden Content] دانلود : معرفی مهاربندهاي کمانش تاب طراحی مهاربندهاي کمانش تاب در نرم افزار ETABS 2015 Design and modelling of BRB in Etabs 2015www.icivil.ir.rar BRBFwww.icivil.ir.rar