Topic
Soil structure interaction
About: Soil structure interaction is a research topic. Over the lifetime, 3653 publications have been published within this topic receiving 48890 citations.
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TL;DR: In this article, a nonlinear, time-domain SSI analysis procedure using a commercial finite-element code is described and compared with those from equivalent-linear analysis in SASSI for high intensity earthquake shaking.
57 citations
TL;DR: The design successfully avoids damage to the structural system, while eliminating the need for any RC in most cases, and was achieved with enough separation between the natural and operational frequencies.
Abstract: This study illustrates design optimization for multiple wind towers located at different villages in Alaska. The towers are supported by two different types of foundations: large mat or deep piles foundations. Initially, a reinforced concrete (RC) mat foundation was proposed. Where soil conditions required it, a pile foundation solution was devised utilizing a 30 in thick RC mat containing an embedded steel grillage of W18 beams and supported by 20–24 in grouted or un-grouted piles. For faster installation and lower construction cost, all-steel foundations were proposed for these remote Alaska sites. The new all-steel design was found to reduce the natural frequencies of the structural system due to softening the foundation. Thus, the tower–foundation system could potentially become near-resonant with the operational frequencies of the wind turbine. Consequently, the likelihood of structural damage or even the collapse is increased. A detailed 3D finite-element model of the tower–foundation–pile system with RC foundation was created using SAP2000. Soil springs were included in the model based on soil properties obtained from the geotechnical investigation. The natural frequency from the model was verified against the tower manufacturer analytical and experimental values. When piles were used, numerous iterations were carried out to eliminate the need for the RC and optimize the design. An optimized design was achieved with enough separation between the natural and operational frequencies. The design successfully avoids damage to the structural system, while eliminating the need for any RC in most cases.
57 citations
TL;DR: In this article, a commercial software for finite element analysis, ANSYS, has been further developed and enhanced for calculation in frequency domain, in which damping of hysteretic type can be considered for both the soil and the structures, so that structure-soil-structure interaction (SSSI) can be investigated making use of a direct methodology.
57 citations
57 citations
TL;DR: In this article, the effects induced by twin-tunnelling on ground and structure settlements are analyzed and discussed and the in situ measurement analysis is subsequently extended to explore the evolution of the structural response of a nine-storey reinforced concrete surface building, undercrossed by the metro-line, as observed during the tunnelling activities.
57 citations