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doi: 10.1002/tal.1207pmid: N/A
Summary Structural design of a 50‐story tall reinforced concrete residential building, which was planned to be constructed in Istanbul and given up afterwards by the investor, has been completed in accordance with the draft version of Seismic Design Code for Tall Buildings in Istanbul that adopts performance‐based seismic design as the basic approach as Tall Buildings Initiative Guidelines do. Seismic design of the building has formed the main part of the structural design process due to high seismicity of the proposed location and extremely irregular floor plan not conforming to usual tall building structures. The building consists of two individual buildings linked through sky floors at the top 12 stories whose design was one of the most challenging works. The building has been designed for design basis earthquake by elastic response spectrum analysis, and its seismic performance has been checked for maximum considered earthquake by nonlinear time‐history analyses carried out using PERFORM‐3D. Copyright © 2015 John Wiley & Sons, Ltd.
doi: 10.1002/tal.1208pmid: N/A
Summary Differential column shortening should be reduced to mitigate the adverse effects caused by such shortening in a tall building. The axial stiffness of columns with greater shortening than adjacent columns should be increased to reduce the differential column shortening. The axial stiffness of the columns can be effectively increased by utilizing additional reinforcement for them. The optimum distributions of this additional reinforcement to reduce the differential column shortening in a tall building are determined. An optimization problem is formulated to minimize the total amount of reinforcement. Three analysis models, namely a fixed‐section, fixed‐stress and general model, are presented as numerical examples. The contour plots for a two‐variable problem of the three analysis models are presented. The generalized reduced gradient method is applied to obtain the optimum solutions of multi‐variable problems. The differential column shortenings after optimization confirm that the optimization program developed in this study can yield the optimum distributions of additional reinforcement. Copyright © 2015 John Wiley & Sons, Ltd.
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