SIMPLIFIED DYNAMIC ANALYSIS OF ECCENTRIC BUILDINGS WITH A SETBACK. 2: THE EFFECT OF S

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SIMPLIFIED DYNAMIC ANALYSIS OF ECCENTRIC BUILDINGS WITH A SETBACK. 2: THE EFFECT OF STIFFNESS IRREGULARITY

Author: GEORGE K. GEORGOUSSIS* | Size: 0.22 MB | Format: PDF | Quality: Unspecified | Publisher: THE STRUCTURAL DESIGN OF TALL AND SPECIAL BUILDINGS Struct. Design Tall Spec. Build. (2009) | Year: 2009 | pages: 16

The effect of stiffness irregularity is investigated in eccentric buildings with a setback. Stiffness irregularity is
assumed to be created when some of the lateral load resisting bents are curtailed at the top of the base structure.
The methodology suggested in the companion paper for assessing vibration frequencies, base shears and torques
is extended to include the effect of curtailed bents. Their contribution is evaluated by an indirect method after
the modal stiffness of the symmetrical counterpart structure is determined and the modal contribution of the full height bents is assessed by Southwell’s approach. A number of numerical examples, representing common types of building structures, are presented to illustrate the procedure and provide an insight into the response of such setback buildings. The results are compared with more accurate results obtained by three-dimensional dynamic analyses.

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