Seismic Interaction of Structures and Soils: Stochastic Approach

Veletsos, A. S.; Prasad, A. Meher

doi:10.1061/(asce)0733-9445(1989)115:4(935)

Cited by 128 publications

(93 citation statements)

References 18 publications

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“…Previous studies showed that SSI systems with s=1 have a much higher effective damping ratio than those with greater slenderness ratios (e.g. s=2, 3 and 4), which is more pronounced in structures with higher structure-to-soil stiffness ratio a 0 [23,42]. Therefore, it is suggested that the difference caused by slenderness ratio in the total structural strength demands is mainly attributed to the effective damping of the SSI system x ssi , which increases as the slenderness ratio is reduced.…”

Section: Effects Of Design Lateral Load Patternmentioning

confidence: 97%

“…The material damping of the soil half-space is also modelled by augmenting each of the springs and dashpots with an additional dashpot and mass, respectively [22]. In this study, the soil material damping ratio x g =5% was specified at the lowest Eigen-frequency w 0 of an SSI system, which can be calculated iteratively according to Veletsos and Nair [23] and Luco and Lanzi [24]. Frequency-dependent impedance functions proposed by Veletsos and Verbic [25] were used to derive w 0 , which was solved iteratively by increasing the frequency of vibration from zero (i.e.…”

Section: Soil-structure Interaction Modelmentioning

confidence: 99%

“…11(b)). This can be explained by the fact that the effective damping ratio of an SSI system could be less than that of the structure in its fixed-base condition, especially for those having a higher slenderness ratio [23,42].…”

Section: Sdof Ductility Reduction Factor R mentioning

confidence: 99%

See 2 more Smart Citations

Performance-based seismic design of flexible-base multi-storey buildings considering soil–structure interaction

Hajirasouliha

Marshall

2016

Engineering Structures

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The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. AbstractA comprehensive parametric study has been carried out to investigate the seismic performance of multi-storey shear buildings considering soil-structure interaction (SSI). More than 40,000 SDOF and MDOF models are designed based on different lateral seismic load patterns and target ductility demands to represent a wide range of building structures constructed on shallow foundations. The cone model is adopted to simulate the dynamic behaviour of an elastic homogeneous soil half-space. 1, 5, 10, 15 and 20-storey SSI systems are subjected to three sets of synthetic spectrum-compatible earthquakes corresponding to different soil classes, and the effects of soil stiffness, design lateral load pattern, fundamental period, number of storeys, structure slenderness ratio and site condition are investigated.The results indicate that, in general, SSI can reduce (up to 60%) the strength and ductility demands of multi-storey buildings, especially those with small slenderness ratio and low ductility demands. It is shown that code-specified design lateral load patterns are more suitable for long period flexible-base structures; whereas a trapezoidal design lateral-load pattern can provide the best solution for short period flexible-base structures. Based on the results of this study, a new design factor R F is introduced which is able to capture the reduction of strength of single-degree-of-freedom structures due to the combination of SSI and structural yielding. To take into account multi-degree-of-freedom effects in SSI systems, a new site and interaction-dependent modification factor R M is also proposed. The R F and R M factors are integrated into a novel performance-based design method for site and interaction-dependent seismic design of flexible-base structures. The adequacy of the proposed method is demonstrated through several practical design examples.

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Section: Effects Of Design Lateral Load Patternmentioning

confidence: 97%

Section: Soil-structure Interaction Modelmentioning

confidence: 99%

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Performance-based seismic design of flexible-base multi-storey buildings considering soil–structure interaction

Hajirasouliha

Marshall

2016

Engineering Structures

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“…In the case of soil-structure interaction (SSI), few empirical studies have been performed due to the limited availability of strong motion data from sites with instrumented structures and free-field accelerographs. In contrast, analytical formulations for SSI are numerous, ranging from complex, three-dimensional finite-element analysis procedures capable of incorporating fully nonlinear dynamic soil modeling [e.g., Borja (1992)] to simplified substructure techniques suitable for implementation in building codes [e.g., Veletsos and Nair (1975)]. While some sophisticated analytical models have been verified using recorded data from nuclear reactor structures or scaled models thereof [e.g., Valera et al (1977) and Bechtel Power Corporation (1991)], empirical studies incorporating a large number of building sites with strong motion recordings are lacking.…”

Section: Introductionmentioning

confidence: 99%

Seismic Soil-Structure Interaction in Buildings. II: Empirical Findings

Stewart

Seed

Fenves

1999

J. Geotech. Geoenviron. Eng.

217

116

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“…Balenda and Heidebrecht [1], and Veletsos and Prasad [2] have shown that SSDI have a significant impact on smaller natural vibration period of structures.…”

Section: Introductionmentioning

confidence: 99%

Neighborhood structure effects on the Dynamic response of soil-structure interaction by harmonic analysis

Pan

2015

MATEC Web of Conferences

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Abstract. For realizing the variation of structural dynamic characteristics due to neighbor structure in buildings group, the surface structure is idealized as an equivalent single degree of freedom system with rigid base whose site consists of a single homogeneous layer. Based on the model, a equivalent method on the equivalent seismic excitation is proposed. Then, the differences of seismic response and equivalent seismic input between soil -structure interaction (SSI) system and structure -soil-structure interaction (SSSI) system are investigated by harmonic analysis. The numerical results show that dynamic responses would be underestimated in SSSI system when the forcing frequencies are close to the Natural frequency if the effects of neighborhood structure were ignored. Neighborhood structure would make the translational displacement increase and rocking vibration decrease. When establishing an effective seismic input, it is necessary to consider the impact of inertia interaction.

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Seismic Interaction of Structures and Soils: Stochastic Approach

Cited by 128 publications

References 18 publications

Performance-based seismic design of flexible-base multi-storey buildings considering soil–structure interaction

Performance-based seismic design of flexible-base multi-storey buildings considering soil–structure interaction

Seismic Soil-Structure Interaction in Buildings. II: Empirical Findings

Neighborhood structure effects on the Dynamic response of soil-structure interaction by harmonic analysis

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