000018583 001__ 18583
000018583 005__ 20170118182229.0
000018583 04107 $$aeng
000018583 046__ $$k2017-01-09
000018583 100__ $$aStewart, Jonathan
000018583 24500 $$aSeismic Earth Pressure Exerted on Rigid Walls By Vertically Heterogeneous Soil Using Winkler Method

000018583 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018583 260__ $$b
000018583 506__ $$arestricted
000018583 520__ $$2eng$$aDuring earthquake ground shaking earth pressures on retaining structures can cyclically increase and decrease as a result of inertial forces applied to the walls and kinematic interactions between the stiff wall elements and surrounding soil. Limit equilibrium analysis imposes a pseudo-static inertial force to a soil wedge behind the wall (the mechanism behind the widely-used Mononobe-Okabe method), which is a poor analogy for either inertial or kinematic wall-soil interaction. Many basement walls and retaining structures are dominated by kinematic soil-structure interaction (SSI) effects arising from differences in displacement between the wall and the free-field soil. Kinematic SSI solutions are often formulated for uniform soil conditions, but the shear modulus of most soils is known to increase with mean effective stress, and therefore with depth. We examine the influence of vertical heterogeneity of shear modulus on kinematic SSI for rigid walls. An existing free-field displacement solution is presented first, followed by analysis of earth pressure increments using a Winkler assumption. Vertical heterogeneity is shown to reduce seismic earth pressures compared with a uniform soil case (for a given frequency and peak ground surface displacement) because free-field displacements are largest near the surface, where the soil is softest and Winkler stiffness is lowest. The proposed Winkler solution is then compared with an exact analytical solution for vertically heterogeneous soil over a rigid base and retained between two opposing rigid walls. The agreement is imperfect, but reasonable, with differences likely due to assumptions regarding the dynamic Winkler stiffness intensity.

000018583 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018583 653__ $$asoil-structure interaction, retaining walls, seismic earth pressure, Winkler

000018583 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018583 720__ $$aStewart, Jonathan$$iMylonakis, George$$iBrandenberg, Scott
000018583 8560_ $$ffischerc@itam.cas.cz
000018583 8564_ $$s433186$$uhttps://invenio.itam.cas.cz/record/18583/files/1755.pdf$$yOriginal version of the author's contribution as presented on USB, paper 1755.
000018583 962__ $$r16048
000018583 980__ $$aPAPER