Performance based Evaluation of the BRB outrigger in reinforced concrete cores under near-field event

Advantages of high-rise buildings with reinforced concrete cores include lower construction costs, higher construction speeds, and the possibility of creating a wider outdoor architecture compared to other high-rise structural systems. As the height of the building increases, the control of lateral displacement of these structures against seismic loads is challenged. The use of arm restraint in structures with cores is one of the welcomed solutions. In this article, first, tall structures with reinforced concrete cores with and without arm restraints are analyzed and designed. The arm restraint has a buckling type brace and the effect of its position on several different levels is investigated. Next, the core modeling is performed with the help of fiber elements with nonlinear behavior for the wall and arm restraint in software. Interclass relative, lateral displacement, anchor and shear are investigated. The results show that the lowest amount of relative lateral displacement between classes is related to the placement of the arm restraint at the level of 0.75 total height from the base level. Advantages of high-rise buildings with reinforced concrete cores include lower construction costs, higher construction speeds, and the possibility of creating a wider outdoor architecture compared to other high-rise structural systems. As the height of the building increases, the control of lateral displacement of these structures against seismic loads is challenged. The use of arm restraint in structures with cores is one of the welcomed solutions. In this article, first, tall structures with reinforced concrete cores with and without arm restraints are analyzed and designed. The arm restraint has a buckling type brace and the effect of its position on several different levels is investigated. Next, the core modeling is performed with the help of fiber elements with nonlinear behavior for the wall and arm restraint in software. Interclass relative, lateral displacement, anchor and shear are investigated. The results show that the lowest amount of relative lateral displacement between classes is related to the placement of the arm restraint at the level of 0.75 total height from the base level. Advantages of high-rise buildings with reinforced concrete cores include lower construction costs, higher construction speeds, and the possibility of creating a wider outdoor architecture compared to other high-rise structural systems. As the height of the building increases, the control of lateral displacement of these structures against seismic loads is challenged. The use of arm restraint in structures with cores is one of the welcomed solutions. In this article, first, tall structures with reinforced concrete cores with and without arm restraints are analyzed and designed. The arm restraint has a buckling type brace and the effect of its position on several different levels is investigated. Next, the core modeling is performed with the help of fiber elements with nonlinear behavior for the wall and arm restraint in PERFORM-3D software. Interclass relative, lateral displacement, anchor and shear are investigated. The results show that the lowest amount of relative lateral displacement between classes is related to the placement of the arm restraint at the level of 0.75 total height from the base level.