A static predictor of seismic demand on frames based on a post-elastic deflected shape

Mori, Y.; Yamanaka, T.; Luco, N.; Cornell, C. A.

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.

Genre:

Article

ProdID:

70028316

Citation Author:

Mori, Y.; Yamanaka, T.; Luco, N.; Cornell, C. A.

Citation Contributing Office:

Citation Datum:

Citation Day:

Citation Edition:

Citation Editor:

Citation End Page:

1318

Citation Issue:

Citation Keywords:

Citation Language:

English

Citation Larger Work Title:

Earthquake Engineering and Structural Dynamics

Citation LatN:

Citation LatS:

Citation LonE:

Citation LonW:

Citation Month:

Citation No Pagination:

Citation Number Of Pages:

Citation Online Only Flag:

Citation Phsyical Description:

Citation Projection:

Citation Public Comments:

Citation Publisher:

Citation Series:

Citation Series Code:

Citation Series Number:

Citation Search Results Text:

A static predictor of seismic demand on frames based on a post-elastic deflected shape; 2006; Article; Journal; Earthquake Engineering and Structural Dynamics; Mori, Y.; Yamanaka, T.; Luco, N.; Cornell, C. A.