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

Basha, B. Munwar; Babu, G. L. Sivakumar

doi:10.1061/(asce)gm.1943-5622.0000037

Cited by 62 publications

(14 citation statements)

References 22 publications

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“…Based on the pseudostatic method, Soubra [13], Choudhury et al [14], and Subba Rao and Choudhury [15] assumed critical rupture surfaces as logarithmic spiral or a combination of logarithmic spiral and straight lines and derived theoretical equations for seismic earth pressures at different dip angles of retaining walls. Also, Basha and Babu [16][17][18][19] studied seismic structures using the pseudodynamic method by assuming curved critical rupture surface for backfill but did not obtain the distributions of seismic earth pressures along the depth of retaining walls. Xu et al [20] applied the LSR (log-spiral-Rankine) model to assess active and passive seismic earth pressures and introduced local and global iteration schemes to solve the resulting highly coupled multivariate nonlinear system of equations, which was more complicated.…”

Section: Introductionmentioning

confidence: 99%

A Pseudodynamic Approach of Seismic Active Pressure on Retaining Walls Based on a Curved Rupture Surface

Yan

Deng

et al. 2020

Mathematical Problems in Engineering

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Reasonable determination of the magnitude and distribution of dynamic earth pressure is one of the major challenges in the seismic design of retaining walls. Based on the principles of pseudodynamic method, the present study assumed that the critical rupture surface of backfill soil was a composite curved surface which was in combination with a logarithmic spiral and straight line. The equations for the calculation of seismic total active thrusts on retaining walls were derived using limit equilibrium theory, and earth pressure distribution was obtained by differentiating total active thrusts. The effects of initial phase, amplification factor, and soil friction angle on the distribution of seismic active earth pressure have also been discussed. Compared to pseudostatic and pseudodynamic methods for the determination of planar failure surface forms, the proposed method receives a bit lower value of seismic active earth pressures.

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Section: Introductionmentioning

confidence: 99%

A Pseudodynamic Approach of Seismic Active Pressure on Retaining Walls Based on a Curved Rupture Surface

Yan

Deng

et al. 2020

Mathematical Problems in Engineering

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“…This study found that the stresses behind the retaining wall and displacements at the top of the wall tend to increase with the decrease of frequency content of earthquake acceleration. Considering the importance of displacement-based methods, researchers have presented various approaches for the estimation of displacement of rigid retaining walls (e.g., Nadim and Whitman 1983;Madabhushi and Zeng 1998;Zeng 1998;Zeng and Steedman 2000;Paruvakat et al 2001;Huang 2005;Choudhury and Nimbalkar 2008;Basha and Babu 2010;Huang et al 2009;Ahmad and Choudhury 2010;Ni et al 2017). Similarly, a few researchers like Green et al (2008); Kloukinas et al (2015); Bakr and Ahmad (2018b) have investigated the deformation mechanism of the cantilever-type retaining wall under the effect of seismic loading.…”

Section: Introductionmentioning

confidence: 99%

Finite-Element Study for Seismic Structural and Global Stability of Cantilever-Type Retaining Walls

2019

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This paper investigates the structural and global stability of a cantilever-type retaining wall under seismic loading using numerical modelling. A new and robust approach is proposed to compute the seismic earth pressure behind the stem and along a virtual plane passing the heel of the wall. The results show that under different earthquake characteristics and wall geometries, the seismic earth pressure forces may be out of phase, leading to different seismic responses of the wall. The critical scenario for the structural stability is observed when the maximum acceleration is directed toward the backfill soil, and the earthquake frequency content is close to the natural frequency of the wall. In contrast, the critical scenario for the global stability occurs when the maximum acceleration is directed with minimum frequency content. Further, the natural frequency of the wall does not affect the global stability of the wall. However, the duration of the applied earthquake acceleration does affect the global stability of the wall, whereas the structural stability remains unaffected by it. In contrast with the current understanding, the possibility of failure of a cantilever-type retaining wall by horizontal sliding is remarkably increased with time of the applied earthquake acceleration.

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“…Choudhury and Nimbalkar [4,5] computed the rotational displacement of gravity retaining wall using rotating block method and pseudo-dynamic seismic inertia forces for both passive and active earth pressure conditions. Basha and Babu [3] used a non-linear failure surface in the computation of rotational displacement for passive condition. Pain et al [9] proposed to update the location of the rotating wall and its influence on the directions of external forces during each time increment of the calculation of rotational displacement.…”

Section: Introductionmentioning

confidence: 99%

Seismic rotational displacement of retaining walls: a pseudo-dynamic approach

Pain

Choudhury

Bhattacharyya

2016

Innov. Infrastruct. Solut.

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Design of earth retaining wall is an important problem in geotechnical engineering. A retaining wall may fail in sliding or rotation. In the present study, rotational mode of failure is considered. A new approach to compute the rotational displacement of gravity retaining wall under seismic condition is proposed. Seismic forces are computed using pseudo-dynamic method. Dry backfill soil is considered. The present solution is for horizontal ground surface. In the computation of rotational displacement, the location of rotating wall and shift in the point of application of all the associated forces after each time step is included which was ignored in earlier studies. From the present analysis, it is found that the rotational displacement depends on the characteristics of the input motion. A nondimensional term is used to quantify the effect of input motion on the rotational displacement. Shear strength properties of the backfill soil and geometry of the wall plays very crucial role in computation of rotational displacement.

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

Cited by 62 publications

References 22 publications

A Pseudodynamic Approach of Seismic Active Pressure on Retaining Walls Based on a Curved Rupture Surface

A Pseudodynamic Approach of Seismic Active Pressure on Retaining Walls Based on a Curved Rupture Surface

Finite-Element Study for Seismic Structural and Global Stability of Cantilever-Type Retaining Walls

Seismic rotational displacement of retaining walls: a pseudo-dynamic approach

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