Seismic interference of two nearby horizontal strip anchors in layered soil

In the present analysis, an attempt is made to explore the seismic response of two nearby horizontal strip anchors embedded in non-homogenous c-ϕ soil deposit at different depths. The analysis is performed by using two-dimensional finite-element software PLAXIS 2D. Each anchor carries equal static safe-working load without violating the ultimate uplift capacity under static condition. The soil is assumed to obey the Mohr–Coulomb failure criterion. The behavior of single isolated anchor subjected to an earthquake loading is determined first to study the interference effect between two anchors. The horizontal acceleration response obtained from the Loma Prieta Gilroy Earthquake (1989) is considered as the input excitation in the analysis. A parametric study is performed by varying the clear spacing (S) between the anchors at different embedment ratios (λ). The magnitude of vertical displacement, shear stress, and shear strain developed at different locations of the failure domain is determined for different clear spacings between the anchors.

[1]  T. Sitharam,et al.  Seismic Hazard Analysis for the Bangalore Region , 2007 .

[2]  K. M. Kouzer,et al.  Vertical uplift capacity of horizontal anchors using upper bound limit analysis and finite elements , 2008 .

[3]  Michael K. Sharp,et al.  Seismic analysis of intake towers considering multiple-support excitation and soil-structure interaction effects , 2004 .

[4]  J. D. Geddes,et al.  Plate Anchor Groups Pulled Vertically in Sand , 1996 .

[5]  C. Clayton.  The Standard Penetration Test , 1995 .

[6]  K. M. Kouzer,et al.  Vertical uplift capacity of a group of shallow horizontal anchors in sand , 2008 .

[7]  P. Ghosh.  Seismic Interference Effect of Two Nearby Square Footings , 2011 .

[8]  Hing-Ho Tsang,et al.  A checking method for probabilistic seismic-hazard assessment: case studies on three cities , 2011 .

[9]  P. Ghosh.  Seismic vertical uplift capacity of horizontal strip anchors using pseudo-dynamic approach , 2009 .

[10]  Jyant Kumar,et al.  Vertical uplift capacity of two interfering horizontal anchors in sand using an upper bound limit analysis , 2009 .

[11]  J. Kumar.  Seismic vertical uplift capacity of strip anchors , 2001 .

[12]  L. John,et al.  Finite dynamic model for infinite media , 1969 .

[13]  G. G. Meyerhof,et al.  The Ultimate Uplift Capacity of Foundations , 1968 .

[14]  Kanakapura S. Subba Rao,et al.  Vertical Uplift Capacity of Horizontal Anchors , 1994 .

[15]  P. K. Basudhar,et al.  A generalized procedure for predicting optimal lower bound break-out factors of strip anchors , 1994 .

[16]  K. Terzaghi,et al.  Soil mechanics in engineering practice , 1948 .

[17]  I. Alpan,et al.  The geotechnical properties of soils , 1970 .

[18]  E. Davis,et al.  THE BEHAVIOUR OF ANCHOR PLATES IN CLAY , 1982 .

[19]  J. D. Geddes,et al.  Uplift of Anchor Plates in Sand , 1987 .

[20]  Kanakapura S. Subba Rao,et al.  Seismic uplift capacity of strip anchors in soil , 2004 .