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Asian Journal of Applied Sciences
  Year: 2009 | Volume: 2 | Issue: 4 | Page No.: 348-362
DOI: 10.3923/ajaps.2009.348.362
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Effect of Dynamic Analysis and Modal Combinations on Structural Design of Irregular High Rise Steel Buildings

B.J. Alsulayfani and T.E. Saaed

The aim of this study is to determines the effects of methods of analysis used in the analysis and design of high rise steel buildings. As it known, many methods are available for the structural analysis of buildings and other civil engineering structures under seismic actions. The differences between them lie in the way they incorporate the seismic input and in the idealization of the structure. There are two procedures for specifying seismic design forces: first, the equivalent static force and second, the dynamic analysis which can take a number of forms. Mode superposition is one of these forms. Design codes have proposed different formulas to obtain a more reasonable estimate of the maximum response from the spectral values (SRSS, CQC, ASCE-98, TEN, ABS, CSM). This research studies the effect of these formulas in the analysis and design of high rise reentrant steel buildings. The study then compares the resulting steel sections weight using static and dynamic analysis, the latter being by means of mode combination methods to show the difference between these formulas, to determine the most influenced structural members and to obtain the vertical loads factor in order to get the required sections using common static analysis for preliminary design purposes. The study shows that modal combination methods slightly affect the result of design for building; the difference among the formulas does not exceed more than 2.5%. The columns especially those at lower floors are mainly affected by seismic forces, while the beams are slightly affected. Finally, a factor of (10.5%) of the total vertical loads (excluding self weight of the building) can be used to predict the members sections, instead of dynamic analysis which is time consuming even with high speed computers like those used in this research.
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How to cite this article:

B.J. Alsulayfani and T.E. Saaed, 2009. Effect of Dynamic Analysis and Modal Combinations on Structural Design of Irregular High Rise Steel Buildings. Asian Journal of Applied Sciences, 2: 348-362.

DOI: 10.3923/ajaps.2009.348.362






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