Torsional and rocking response of the foundation induced by obliquely spatial incident S waves

Zhou, Fangyuan; Wei, Xu; Wang, Haidong; Zhu, Hongping; Zhi-jin, Zhou

doi:10.1016/j.soildyn.2019.105977

Cited by 4 publications

(2 citation statements)

References 24 publications

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“…Figure 4C displays δ for θ v = 60° and θ h = 45°. As per the figure, a smaller incidence angle leads to a larger torsional response, which is in agreement with previous studies 13,31 . − 32 Comparing Figure 4A and C, the value of δ is 3–5 percentage points higher for θ v = 60° than that for θ v = 70°.…”

Section: Results and Analysissupporting

confidence: 91%

“…The rapid development of computer capabilities, such as better numerical methods for soil modeling, 13 building modeling, 14,15 and torsional ground motion analysis, 16 has enabled more sophisticated investigations on torsional SSI since the 1990s. Although more studies on the accidental eccentricity factor are available, consensus regarding the proper choice of codified values and criteria for seismic design has not emerged.…”

Section: Introductionmentioning

confidence: 99%

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Torsion in symmetric buildings due to soil‐structure interaction: A discussion on code values of accidental eccentricity factor in seismic design

Chen

2022

Earthq Engng Struct Dyn

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Soil-structure interaction (SSI) is often neglected in seismic design because of its inherent complexity. Therefore, SSI-related research is crucial for ensuring that more significant issues reach engineering practice. This study focused on torsional motion to investigate the accidental eccentricity caused by SSI effect by comparing the proportional relationship between the torsional motion of an SSI system and the translational motion of a fixed-base oscillator. The SSI model was created using a three-dimensional rectangular foundation embedded in a layered half-space with an oscillator mounted on the top. We employed an indirect boundary element method (IBEM) combined with non-singular Green's functions of distributed loads to calculate the system responses of the SSI. Parametric analysis-based results in the frequency domain revealed that the accidental eccentricity factor owing to SSI was typically in the range of 0.03-0.15. Additionally, a case study of four buildings subjected to 42 earthquakes revealed that the accidental eccentricity factor exceeded 0.05 in several cases, and 0.2 in some cases. Furthermore, it depended on the excitation spectral shape and dynamic characteristics of the SSI system. Therefore, the coded accidental eccentricity factor value of 0.05 is insufficient for ensuring the safety of buildings from the torsional effect of SSI, and a value of 0.1 is more reasonable.

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Section: Results and Analysissupporting

confidence: 91%