Footings under seismic loading: Analysis and design issues with emphasis on bridge foundations

Mylonakis, G; Nikolaou, S; Gazetas, G

dc.contributor.author	Mylonakis, G	en
dc.contributor.author	Nikolaou, S	en
dc.contributor.author	Gazetas, G	en
dc.date.accessioned	2014-03-01T01:24:25Z
dc.date.available	2014-03-01T01:24:25Z
dc.date.issued	2006	en
dc.identifier.issn	0267-7261	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17255
dc.subject	Dynamics	en
dc.subject	Footings	en
dc.subject	Impedance	en
dc.subject	Kinematic response	en
dc.subject	Numerical methods	en
dc.subject	Soil-structure interaction	en
dc.subject.classification	Engineering, Geological	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.other	Bridge piers	en
dc.subject.other	Damping	en
dc.subject.other	Dynamic response	en
dc.subject.other	Foundations	en
dc.subject.other	Graphic methods	en
dc.subject.other	Numerical methods	en
dc.subject.other	Seismology	en
dc.subject.other	Stiffness	en
dc.subject.other	Structural analysis	en
dc.subject.other	Kinematic response	en
dc.subject.other	Spread footings	en
dc.subject.other	Soil structure interactions	en
dc.subject.other	bridge	en
dc.subject.other	footing	en
dc.subject.other	kinematics	en
dc.subject.other	soil-structure interaction	en
dc.subject.other	Agrostis	en
dc.title	Footings under seismic loading: Analysis and design issues with emphasis on bridge foundations	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.soildyn.2005.12.005	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.soildyn.2005.12.005	en
heal.language	English	en
heal.publicationDate	2006	en
heal.abstract	The paper provides state-of-the-art information on the following aspects of seismic analysis and design of spread footings supporting bridge piers: (1) obtaining the dynamic stiffness (""springs"" and ""dashpots"") of the foundation; (2) computing the kinematic response; (3) determining the conditions under which foundation-soil compliance must be incorporated in dynamic structural analysis; (4) assessing the importance of properly modeling the effect of embedment; (5) elucidating the conditions under which the effect of radiation damping is significant; (6) comparing the relative importance between kinematic and inertial response. The paper compiles an extensive set of graphs and tables for stiffness and damping in all modes of vibration (swaying, rocking, torsion), for a variety of soil conditions and foundation geometries. Simplified expressions for computing kinematic response (both in translation and rotation) are provided. Special issues such as presence of rock at shallow depths, the contribution of foundation sidewalls, soil inhomogeneity and inelasticity, are also discussed. The paper concludes with parametric studies on the seismic response of bridge bents on embedded footings in layered soil. Results are presented (in frequency and time domains) for accelerations and displacements of bridge and footing, while potential errors from some frequently employed simplifications are illustrated. © 2006 Elsevier Ltd. All rights reserved.	en
heal.publisher	ELSEVIER SCI LTD	en
heal.journalName	Soil Dynamics and Earthquake Engineering	en
dc.identifier.doi	10.1016/j.soildyn.2005.12.005	en
dc.identifier.isi	ISI:000240672500002	en
dc.identifier.volume	26	en
dc.identifier.issue	9	en
dc.identifier.spage	824	en
dc.identifier.epage	853	en