American Society of Civil Engineers


Seismic Rotational Displacements of Gravity Walls by Pseudodynamic Method with Curved Rupture Surface


by B. Munwar Basha, (Postdoctoral Fellow, Dept. of Civil Engineering, Indian Institute of Science, Bangalore 560012, India. E-mail: mbasha@gmail.com) and G. L. Sivakumar Babu, (corresponding author), M.ASCE, (Professor, Dept. of Civil Engineering, Indian Institute of Science, Bangalore 560012, India E-mail: gls@civil.iisc.ernet.in)

International Journal of Geomechanics, Vol. 10, No. 3, May/June 2010, pp. 93-105, (doi:  http://dx.doi.org/10.1061/(ASCE)GM.1943-5622.0000037)

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Document type: Journal Paper
Abstract: This paper presents the use of pseudodynamic method to compute the rotational displacements of gravity retaining walls under passive condition when subjected to seismic loads. The concept of Newmark sliding block method for computing the rotational displacements under seismic condition and the limit equilibrium analysis have been combined in this paper to evaluate the performance of a gravity retaining walls under seismic conditions. One of the main features of the paper is the adoption of a new procedure to evaluate seismic passive earth pressure considering composite curved rupture surface (which is the combination of arc of a logarithmic spiral and straight line) and the dynamic nature of earthquake loading, which is useful to predict rotational displacements accurately. It also determines the threshold seismic acceleration coefficients for rotation using Newmark’s sliding block method. It is shown that the assumption of planar failure mechanism for rough soil-wall interfaces significantly overestimates the threshold seismic accelerations for rotation and underestimates the rotational displacements.


ASCE Subject Headings:
Displacement
Earth pressure
Retaining structures
Seismic effects
Time dependence

Author Keywords:
Displacement
Earth pressure
Time dependence
Retaining walls
Seismic effects