Abstract
This paper introduces a reduced 3D diagrid model to save both time and computer memory for modeling and seismic analysis. The analysis of different models of steel diagrid tall buildings with variable heights and inclinations of diagrid is performed applying a finite element program SAP2000. Three clusters of diagrid buildings with different aspect ratios (height-to-width) and reliable optimum inclination angles are examined. The cross sections for diagrid elements are designed using stiffness -based design method which is more reliable for diagrid buildings. The 3D finite element model as a real structure and the proposed reduced seismic model that reducing finite element model up to twenty percent by canceling a specified number of floors with restrictions in modeling are employed. Equivalent lateral Force, dynamic response spectrum, and linear time history analyses are considered. A comparison of obtained results in terms of lateral displacement at top of the building, first mode period of vibration and base shear are presented. The conclusions reveal that the proposed reduced 3D model is convince for preliminary modeling and analysis of regular diagrid buildings in existence of seismic loads.
Highlights
THE development of structural engineering has become more effective in the present decade
The results showed that the optimal angle of high-rise diagrid buildings falls within 55° to 75°
For comparison between the original and reduced model, four methods are used in the analysis as: 1-Modal 2-Equivalent lateral force (ELF) 3-Dynamic response spectrum (RSP) 4-Linear time history (LTH) The heights of the analyzed buildings are ranged from 120.0 m to 320.0 m with inclinations of diagrid ranged between 60.94o and 71.56o
Summary
THE development of structural engineering has become more effective in the present decade. Emeritus Associate professor in Department of Structural Engineering, Faculty of Engineering, Mansoura University, Mansoura, Egypt. Rofessor in Department of Structural Engineering, Faculty of Engineering, Mansoura University, Mansoura, Egypt. These buildings invent new systems for lateral load resistance. The main idea of the diagrid is the possible saving due to the removal of vertical columns. This system gives a large open area, and charming exposure. Diagrid structure is modeled as a vertical cantilever and subdivided longitudinally into a triangular diagrid module according to the repetitive diagonal (Ser. No BFEMU-2008-1042). The main objective of this paper is to propose a reduced 3D model of regular diagrid tall buildings for quick seismic analysis. Equivalent lateral force, dynamic response spectrum, and linear time history analyses have been performed to evaluate the applicability to use the reduced seismic model in the preliminary analysis
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