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Soil dynamics and dynamic soil-structure interaction
Author: G. Degrande and S. Fran¸ cois | Size: 4 MB | Format:PDF | Quality:Unspecified | Publisher: GrasMech Course, Cyclic and Dynamic Loads in Civil Engineering, 5 May 2009 | Year: 2009 | pages: 68
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This paper deals with the response of building clusters during earthquakes,
their effect on the ground motion, and how individual buildings interact with the
soil and with each other. We simulate the ground motion during the 1994
Northridge earthquake and focus on the coupled response of multiple simplified
building models located within the San Fernando Valley. Numerical results show
that the soil-structure interaction (SSI) effects vary with the number and dynamic
properties of the buildings, their separation, and the impedance with respect to the
soil. These effects appear as: (i) an increased spatial variability of the ground
motion; and (ii) significant reductions in the buildings' base motion at high
frequencies, changes in the higher natural frequencies of the building-foundation
systems and variations in the average roof drift, with respect to those of the
corresponding rigid-base and isolated SSI models.
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Non-Linear Seismic Soil-Structure Interaction Analysis Based on the Substructure Method in the Time Domain _
Author: Turk J Engin Environ Sci 25 (2001) , 617 | Size: 0.28 MB | Format:PDF | Quality:Unspecified | Publisher: Mustafa KUTAN _ IS, Muza er ELMAS SA ¨ U M¨ uhendislik Fak¨ ultesi, _ In saat M¨ uh. B¨ ol¨ um¨ u, Yap ABD Esentepe Kamp¨ us¨ u, Adapazar -TURKEY | pages: 10
This paper presents an idealized 2-dimensional plain strain nite element seismic soil-structure interaction
(SSI) analysis based on a substructure method by using original software developed by the authors. To
investigate the e ects of SSI the following types of analysis were performed: linear SSI analysis and non-linear
SSI analysis. For the same structure, analysis was carried out by the procedure without the consideration of
soil-structure interaction. These computations were achieved for di erent peak accelerations: 0.15g, 0.30g
and 0.45g. In another case for a di erent site soil with a shear wave velocity of 200, 300 and 500 m/s,
a linear SSI analysis was performed. In the analysis, the radiation condition was fully accounted for, the
soil plasticity was modeled with the Von Mises failure criterion, basemat uplift was not considered, and the
action of gravity was not taken into consideration.
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SHORT COMMUNICATION Influence of the soil–structure interaction on the fundamental period of buildings
Author: Louay Khalil , Marwan Sadek , , and Isam Shahrour | Size: 0.16 MB | Format:PDF | Quality:Unspecified | Publisher: EARTHQUAKE ENGINEERING AND STRUCTURAL DYNAMICS Earthquake Engng Struct. Dyn. 2007; 36:2445–2453 Published online 2 August 2007 in Wiley InterScience. DOI: 10.1002/eqe.738 | Year: 2007 | pages: 9
This paper includes an investigation of the influence of the soil–structure interaction (SSI) on the fundamental period of buildings. The behaviour of both the soil and the structure is assumed to be elastic. The soil-foundation system is modelled using translational and rotational discrete springs. Analysis is first conducted for one-storey buildings. It shows that the influence of the SSI on the fundamental frequency of building depends on the soil–structure relative rigidity Kss. Analysis is then extended for multi-storey buildings. It allows the generalization of the soil–structure relative rigidity Ks to such complex structures. Charts are proposed for taking into account the influence of the SSI in the calculation of the fundamental frequency of a wide range of buildings.
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DYNAMIC SOIL BEHAVIOR and DYNAMIC SOIL-STRUCTURE INTERACTION
Author: George Gazetas Professor of Civil Engineering National Technical University of Athens | Size: 6.2 MB | Format:PDF | Quality:Unspecified | Publisher: SERINA 1997, THESSALONIKI | Year: 2001 | pages: 73
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RECOMMENDATIONS FOR SOIL STRUCTURE INTERACTION (SSI) INSTRUMENTATION
Author: M. Çelebi and C.B. Crouse | Size: 0.33 MB | Format:PDF | Quality:Unspecified | Publisher: COSMOS (Consortium of Organizations for Strong-Motion Observation Systems) Workshop on Structural Instrumentation Emeryville, Ca. November 14-15, 2001 | Year: 2001 | pages: 18
The objectives of this paper are to:
• introduce the recommendations of a workshop held in 1992 that aimed to define the
background information in establishing a special purpose array in a seismically
active region of the United States to study specifically the effect of SSI and define
the parameters and details of a SSI experiment,
• summarize two recent workshops that in general discussed the SSI subject,
• describe the current state of implementation in the US and Japan.
The objectives of the 1992 workshop were: (a) to bring together a panel of experts to reach a
consensus on the benefits and feasibility of instrumenting a building in a seismically active region of
the United States to study specifically the effect of SSI, and (b) to discuss and determine the details
of such a SSI experiment.
1
Research Civil Engineer, USGS (MS977), 345 Middlefield Rd., Menlo Park, Ca. 94025
2
Principal Engineer and Vice President, URS Corporation, Seattle, WA 98101-1616
Celebi_cosmos_ssi_pap 11/7/2001 12:27 PM
1
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Soil structure interaction analysis methods - State of art-Review
Author: Siddharth G. Shah , Solanki C.H. , Desai J.A. | Size: 0.36 MB | Format:PDF | Quality:Unspecified | Year: 2011 | pages: 29
Soil flexibility has to be considered in the analysis of massive structures to avoid failure
and ensure safe service. Post failure analysis of massive structures realized the
importance of SSI-soil structure interaction. In the literature as many as half dozen
methods are available but researches and designers are not clear about the history &
development in this field. Current paper attempts to review the stat of art about soil
structure interaction analysis methods. The review reveals that for simple analysis direct
methods-Global procedures are physible while for non linear analysis substructure
method is effective and simple to apply.
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SOIL STRUCTURE INTERACTION EFFECTS ON MULTISTOREY R/C STRUCTURES
Author: Muberra ESER AYDEMIR | Size: 2.9 MB | Format:PDF | Quality:Unspecified | Publisher: INTERNATIONAL JOURNAL OF ELECTRONICS; MECHANICAL and MECHATRONICS ENGINEERING Vol.2 Num.3 pp.(298-303) | pages: 6
his paper addresses the behavior of multistorey structures considering soil structure interaction under
earthquake excitation. For this purpose, sample 3, 6, 9 storey RC frames are designed based on Turkish Seismic
Design Code and analyzed in time domain with incremental dynamic analysis. Strength reduction factors are
investigated for generated sample plane frames for 64 different earthquake motions recorded on different site
conditions such as rock, stiff soil, soft soil and very soft soil. According to the analysis result, strength reduction
factors of sample buildings considering soil structure interaction are found to be almost always smaller than
design strength reduction factors given in current seismic design codes, which cause an unsafe design and nonconservative
design forces.
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Calculating long-term settlement in soft clays – with special focus on the Gothenburg region
Author: MATS OLSSON | Size: 5.3 MB | Format:PDF | Quality:Unspecified | Publisher: Department of Civil and Environmental Engineering Division of GeoEngineering CHALM ERS UNIVERSITY OF TECHNOLOGY Götebor g, Sweden 20 10 | Year: 2010 | pages: 132
Long-term settlement in clay constitutes an engineering challenge in road design
and construction in areas with deep deposits of soft clay. Soil improvement and
construction of building foundations or embankments can be quite complicated
and expensive in such areas. Construction costs need to be balanced against high
maintenance costs. In order to do this optimally, there is a need to predict longterm
settlement with a high degree of accuracy.
Two different test sites were chosen for back-calculation, a test embankment at
Nödinge and a groundwater lowering at Kaserntorget. There was also one
hypothetical test site.
In this thesis a short description is presented of the fundamental behaviour of soft
clays with regard to compressibility as well as a short explanation of the theory
for the three different models that has been used within this thesis – Embankco,
GS Settlement and the Soft Soil Creep model.
Soil parameter determination for long-term settlement analysis is discussed
together with some of the inherent complications. For the IL oedometer test the
study shows that if the time for the load stage of interest is not sufficiently long
the evaluated creep parameter could be misleading. Back-calculation of CRS
oedometer test, using the Soft Soil Creep model, is performed for this model and
a procedure is suggested.
The outcome of the analysis shows that all three models produce similar results
for the hypothetical case. For the two test sites in question, both GS Settlement
and the Soft Soil Creep model were capable of predicting the measured
settlement with acceptable accuracy. The Embankco program was only used for
the hypothetical case.
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