Abstract
The diagrid structure system has become an encouraging alternative for the construction of tall buildings partly because of the aesthetic reason. Structurally, the system also interesting because its diagonal intersecting members are capable of resisting vertical and lateral forces efficiently. This research compared the design of steel tower building using diagrid (DIA) system and the more commonly used systems, moment frame (MF) and braced frame (BF). Numerical modelling using finite element software ETABS were conducted to design a 10-story building of 15x15m with total height of 50 meters. The seismic behaviors of all models were compared under the same loading conditions. From the analysis results the DIA model showed superior seismic behavior followed by BF and MF. The DIA model was not only stiffer than the others, but also required smaller volume of steel.
Highlights
Construction of tall towers has become trends everywhere to attract attention and become the landmark of the place where it is built
All dimensions were determined by trial to meet stress ratio less than 1.0 according to AISC 360-10 provisions [11] and inter-story drift ratio not to exceed 0.020hsx according to ASCE/SEI 7-10 specifications [4]
With the chosen size of geometry and frame members, the design of the moment frame (MF) model was dictated by its lateral stiffness, while the other two models were controlled by its strength
Summary
Construction of tall towers has become trends everywhere to attract attention and become the landmark of the place where it is built. Diagrid is one of the structural systems that become an encouraging alternative for the construction of a steel tower along with another structural system such as truss, conventional moment frame, and braced frame. Many other attractive towers were built using conventional moment frame (MF), braced frame (BF) and diagonal grid or diagrid (DIA) structural systems. DIA, is believed to be a better choice concerning aesthetic, efficiency and lateral stiffness for the case of special shaped and very tall tower of 20 stories and higher. A study suggested that DIA is more efficient and laterally stiffer https://doi.org/10.10 51/matecconf /201927601026 than MF because the diagonal grid is capable of resisting shear and axial forces [7,8,9]. Comparison between the three systems, are not yet clear and need to be investigated
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