NDLI: Filtering effect induced by rigid massless embedded foundations

Content Provider	Springer Nature Link
Author	Conti, Riccardo Morigi, Marco Viggiani, Giulia M. B.
Copyright Year	2016
Abstract	It is well recognised that the dynamic interaction between structure, foundation and supporting soil can affect significantly the seismic behaviour of buildings. Among other effects, embedded and deep foundations can filter the seismic excitation, causing the foundation input motion (FIM) to differ substantially from the free-field motion. This paper presents a theoretical and numerical investigation on the filtering effect induced by rigid massless embedded foundations. Based on the results of dimensional analysis and numerical simulations, it is shown that the problem can be reasonably described by two sole dimensionless groups, namely: (1) ωH/V S, relating the wave length of the signal to the embedment depth of the foundation, and (2) the aspect ratio of the foundation, B/H, where B is the foundation width in the polarization plane. New simplified and physically sound expressions are derived for the kinematic interaction factors, $$ I_{u} = u_{\text{FIM}} /u_{{{\text{ff}}0}} $$ and $$ I_{\theta } = \theta_{\text{FIM}} H/u_{{{\text{ff}}0}} $$ , which are frequency-dependent transfer functions relating the harmonic steady-state motion experienced by the foundation to the amplitude of the corresponding free-field surface motion. Standard methods for using these functions in the evaluation of the FIM are critically reviewed, with reference to both static and dynamic procedures for the seismic design of structures.
Starting Page	1019
Ending Page	1035
Page Count	17
File Format	PDF
ISSN	1570761X
Journal	Bulletin of Earthquake Engineering
Volume Number	15
Issue Number	3
e-ISSN	15731456
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-08-10
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Soil–structure interaction Foundation input motion Free-field motion Kinematic response Embedded foundation Geotechnical Engineering & Applied Earth Sciences Environmental Engineering/Biotechnology Civil Engineering Geophysics/Geodesy Hydrogeology Structural Geology
Content Type	Text
Resource Type	Article
Subject	Building and Construction Geophysics Geotechnical Engineering and Engineering Geology Civil and Structural Engineering

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