Assessing residual deformation of bridge piers under bidirectional near-fault motions with forward directivity and fling-step

Santra, Atanu; Roy, Rana

doi:10.1007/s10518-023-01654-6

Cited by 5 publications

(8 citation statements)

References 83 publications

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“…Two percent of Rayleigh damping is considered. 10 Forced-based criteria (maximum no of iteration: 10 and tolerance limit: 10 −6 ) within each sufficiently small time-step are used to achieve convergence. The effect of axial force and geometric nonlinearity 54 have also been accounted for.…”

Section: Methodsmentioning

confidence: 99%

“…For circular (and approximately for square also), the response to bidirectional shaking is insensitive to orientations. 9,10,14 Hence, based on the response to twenty seven as-recorded motions, as presented for Pier-I in Figure 12, the mean response (r (B)µ ) of the pier is estimated. For Pier-I, the deformation (Δ (B) ) and Park-Ang index (DI (B) ) under bidirectional loading are estimated as 0.13 m (COV: 0.47) and 0.74 (COV: 0.46), respectively.…”

Section: Response Of Piersmentioning

confidence: 99%

“…Evidently, the application of recorded ground motions along the principal axis of a structure is an oversimplified assumption, especially in the face of the sensitivity of the response to the incidence angles (directionality effect). [9][10][11] The recognition of the most preferred orientation and its successful application in a series of studies 9,10,[12][13][14] epitomize that the unidirectional analysis in the most preferred orientation may be adequate, precluding the inherent challenges of both the bidirectional analysis and uncertainties of incidence angles. The preferred orientation can be uniquely defined in terms of pure ground motion properties that can be derived knowing the details of the horizontal components of a chosen pair without reference to a strcuture.…”

Section: Introductionmentioning

confidence: 99%

“…The preferred orientation can be uniquely defined in terms of pure ground motion properties that can be derived knowing the details of the horizontal components of a chosen pair without reference to a strcuture. 9,10,[12][13][14] Unfortunately, the details of the ground motion remain unknown in design contexts. Rather the intensity of seismic shaking of a region is commonly specified in the form of a smooth spectrum that emerges from the records with similar seismological and site conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Since the ground acceleration in a real earthquake varies with time in both magnitude and direction, the acceleration history is recorded by a pair of sensors preinstalled in mutually orthogonal orientations. Evidently, the application of recorded ground motions along the principal axis of a structure is an oversimplified assumption, especially in the face of the sensitivity of the response to the incidence angles (directionality effect) 9–11 …”

Section: Introductionmentioning

confidence: 99%

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Estimating structural response to bidirectional seismic excitation using spectrum compatible motions: Performance of a pair of companion spectra

Acharjya,

Santra,

Roy

2024

Earthq Engng Struct Dyn

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Bidirectional analyses covering a range of incidence angles for several records are essential yet challenging for routine design. Recent studies have shown that the response to bidirectional shaking may be estimated per straightforward unidirectional analysis in the most preferred orientation in conjunction with the orthogonal combination rules, and this can also remove the need for various incidence angles. Further, it is well known that the mean response can be estimated with reduced dispersion using fewer spectrum‐compatible records. Combining the advantages of both, a pair of companion spectra independent of period and orientation has recently been developed. While the basis of the companion spectra is established therein from a sound mathematical perspective, the applicability of the proposed spectra to real structures may be revisited, especially to structures sensitive to bidirectional interaction, before recommending the companion spectra for practical design. To achieve this end, following a brief scrutiny of the companion spectra, the performance of the same is critically examined for idealized SDoF analogues and real structures such as bridge piers representative of SDoF systems and buildings with asymmetry using single storey and multistorey models (MDoF systems). The results show that the response of the real structures to bidirectional seismic loading can be reasonably estimated with reduced dispersion using fewer records compatible with the pair of the companion spectra. As such, the critical response parameters may be computed by actual bidirectional analyses or by combining responses to unidirectional analyses under fewer spectrum compatible records. Hence, the pair of companion spectra that can be used as “target” to independently match two components of a chosen record is useful for practical design.

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Section: Methodsmentioning

confidence: 99%

Section: Response Of Piersmentioning

confidence: 99%