The Effect of Opening Distribution on the Structural Behavior of High-Rise Reinforced Concrete Buildings with External Grid System

In high-rise concrete buildings, the external grid consists of a reinforced concrete shell, which has a large number of openings and is resistant to gravity and lateral loads. In this paper, the effect of opening distribution on reinforced concrete external grid is studied. For this purpose, high-rise reinforced concrete structures of 20, 30, 40 and 50 floors with external grid and in three different modes of opening in the external grid are considered. In model 1 (base model), the openings are regularly distributed in the external grid of the building, but in Model 2, the openings are concentrated in the middle of the grid funds and in Model 3, the openings are concentrated in the corners of the external grid. Selective parameters for estimating the optimal opening location in the external grid of high-rise reinforced concrete buildings are the lateral displacement of the floor and the drift index of each floor. Also, in order to determine the optimal location of the core, the percentage of shear absorption and moment due to the seismic force between the core and the external grid is investigated. The results showed that in buildings with low aspect ratio, the best position of the opening is the regular distribution of openings in the external grid, but in buildings with higher aspect ratio, the best location of the opening is in the middle parts of the external grid.