Paper title: Air-Void Stability in Self-Consolidating Concrete
Document Name: 99-M41
Author(s): Kamal H. Khayat and Joseph Assaad
Publication: Materials Journal
Volume: 99
Issue: 4
Pages: 408-416
Keywords: admixture; air void; consolidation
Date: July 1, 2002
1) UIC-772-1. Standard principles for the use of bearings made from various materials for railway bridges
2) UIC-774-3. Track-Bridhe Interaction. Recomandations for calculations
3) UIC-776-1. Charges a prendre en consideration dans le calcul des ponts-rails
4) UIC-776-2. Design requirements for rail-bridges based on interaction phenomena between train, track and bridge
5) UIC 776-3. Deformation of bridges
6) Design of railway structures to the Structural Eurocodes
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Soil–structure interaction in tall buildings by a discrete force method
Author: A. Nadjai, BEng, MSc, PhD, MIStructE, MIABSE, PGCUT, D. Johnson, BEng, MSc, PhD, MICE, FIStructE, and J. F. Lyness, BSc, MSc, PhD, MICE, FIStructE, AFIMA | Size: 0.22 MB | Format:PDF | Quality:Unspecified
The importance of base flexibility on the elasto-plastic behaviour of spatial shear walls subjected to any type of loading was examined. An analysis of elasto-plastic spatial shear walls was developed using a discrete force method, which models the shear walls as a system of interconnected discrete structural elements and the base flexibility by effective rotational and vertical elastic stiffnesses Kb and Kv, respectively. As the magnitudes of these stiffnesses depend on the properties of the supporting soil and also on the characteristics of the foundation itself, different soils were considered. The analysis was based on the force approach, using as redundants the shear forces, not only at the contraflexural points of the connecting beams, but also at wall junctions. The elasto-plastic condition was restricted to the connecting beams by using a convenient bilinear model for the force formulation. The objective was to provide a theoretical treatment of the foundation–structure interaction that is suitable for implementation in the discrete force method. In addition, the results obtained in the discrete force modelling of the soil interaction are presented, and the applicability of the model to some representative problems is discussed.
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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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