A static predictor of seismic demand on frames based on a post-elastic deflected shape
Earthquake Engineering and Structural Dynamics
By: Y. Mori, T. Yamanaka, N. Luco, and C.A. Cornell
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Abstract
Predictors of seismic structural demands (such as inter-storey drift angles) that are less time-consuming than nonlinear dynamic analysis have proven useful for structural performance assessment and for design. Luco and Cornell previously proposed a simple predictor that extends the idea of modal superposition (of the first two modes) with the square-root-of-sum-of-squares (SRSS) rule by taking a first-mode inelastic spectral displacement into account. This predictor achieved a significant improvement over simply using the response of an elastic oscillator; however, it cannot capture well large displacements caused by local yielding. A possible improvement of Luco's predictor is discussed in this paper, where it is proposed to consider three enhancements: (i) a post-elastic first-mode shape approximated by the deflected shape from a nonlinear static pushover analysis (NSPA) at the step corresponding to the maximum drift of an equivalent inelastic single-degree-of-freedom (SDOF) system, (ii) a trilinear backbone curve for the SDOF system, and (iii) the elastic third-mode response for long-period buildings. Numerical examples demonstrate that the proposed predictor is less biased and results in less dispersion than Luco's original predictor. Copyright ?? 2006 John Wiley & Sons, Ltd.
Suggested Citation
Mori, Y., Yamanaka, T., Luco, N., and Cornell, C., 2006, A static predictor of seismic demand on frames based on a post-elastic deflected shape: Earthquake Engineering and Structural Dynamics, v. 35, no. 10, p. 1295-1318, https://doi.org/10.1002/eqe.587.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | A static predictor of seismic demand on frames based on a post-elastic deflected shape |
| Series title | Earthquake Engineering and Structural Dynamics |
| DOI | 10.1002/eqe.587 |
| Volume | 35 |
| Issue | 10 |
| Year Published | 2006 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Earthquake Engineering and Structural Dynamics |
| First page | 1295 |
| Last page | 1318 |