The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
V. B. Deshmukh - One of the best experts on this subject based on the ideXlab platform.
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Uplift Capacity of Horizontal Strip Anchors in Cohesionless Soil
Geotechnical and Geological Engineering, 2011Co-Authors: V. B. Deshmukh, D. M. Dewaikar, Deepankar ChoudharyAbstract:This paper presents the details of the theoretical analysis of net uplift capacity of horizontal strip anchor in Cohesionless Soil using Kötter’s equation. A plane failure surface inclined at a characteristic angle with the ground surface is assumed. Results obtained using the proposed method are compared with the available experimental results of 30 cases for dense to loose Cohesionless Soil, with the maximum embedment ratio of 8. It is observed that the proposed method leads to the predictions of net uplift capacity of horizontal strip anchor that are very close to the experimental results in 93% cases. The comparison of results with available theoretical solutions shows that, proposed method makes better predictions for anchor embedment ratio less than 8 in dense Cohesionless Soils.
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Computations of uplift capacity of pile anchors in Cohesionless Soil
Acta Geotechnica, 2010Co-Authors: V. B. Deshmukh, D. M. Dewaikar, Deepankar ChoudhuryAbstract:A method of analysis for the uplift capacity of pile anchors in Cohesionless Soil is proposed using Kötter’s equation that facilitates computation of the distribution of Soil reaction on the axis-symmetric failure surface, which is assumed to be the frustum of a cone with a characteristic angle of inclination with the pile–Soil interface. A closed-form solution for the uplift capacity is obtained with no requirement of any charts or tables. Empirical relations using available literature are proposed for expressing critical embedment ratio and computation of net uplift capacity. The results are compared with a set of experimental data for 28 cases, ranging from loose to dense Cohesionless Soil up to maximum embedment ratio of 40, vis-à-vis available theoretical solutions. The proposed method leads to the predictions that are in good agreement with the experimental results. It further demonstrates the successful application of Kötter’s equation in the estimation of uplift capacity of pile anchors.
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Uplift Capacity of Pile Anchors in Cohesionless Soil
Deep Foundations and Geotechnical In Situ Testing, 2010Co-Authors: V. B. Deshmukh, D. M. Dewaikar, Deepankar ChoudhuryAbstract:An analysis of uplift capacity of pile anchors in Cohesionless Soil is proposed in which Kotter’s equation is employed to obtain the distribution of Soil reaction on the axisymmetric failure surface, assumed to be the frustum of a cone with a characteristic angle of inclination with the pile-Soil interface. A closed form solution for the uplift capacity of pile anchor is obtained with no requirement of any charts or tables. The results are compared with experimental data for a total 28 cases, ranging from loose to dense Cohesionless Soil, with maximum embedment ratio of 40, vis-a-vis available theoretical solutions. The proposed method leads to the predictions that are very close to the experimental results in 75% cases and this demonstrates the successful application of Kotter’s equation for the estimation of the uplift capacity of pile anchors.
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Analysis of rectangular and square anchors in Cohesionless Soil
International Journal of Geotechnical Engineering, 2010Co-Authors: V. B. Deshmukh, D. M. Dewaikar, Deepankar ChoudhuryAbstract:AbstractHorizontal anchors are widely used in civil engineering projects to resist uplift loads. A few theories are available for predicting uplift capacity of rectangular/square anchors. The theoretical methods suggested by Meyerhof and Adams and Murray and Geddes estimated the uplift capacity of rectangular/square with significant errors. An analytical method based on Kotter's equation is proposed for estimating the net uplift capacity of a horizontal rectangular/square in Cohesionless Soil. Application of Kotter's equation gives distribution of Soil reaction on the failure surface, which is assumed to be the frustum of a trapezoid with a characteristic angle of inclination with the horizontal. A closed form solution for the uplift capacity is obtained with no requirement of any charts or tables.
Deepankar Choudhury - One of the best experts on this subject based on the ideXlab platform.
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Computations of uplift capacity of pile anchors in Cohesionless Soil
Acta Geotechnica, 2010Co-Authors: V. B. Deshmukh, D. M. Dewaikar, Deepankar ChoudhuryAbstract:A method of analysis for the uplift capacity of pile anchors in Cohesionless Soil is proposed using Kötter’s equation that facilitates computation of the distribution of Soil reaction on the axis-symmetric failure surface, which is assumed to be the frustum of a cone with a characteristic angle of inclination with the pile–Soil interface. A closed-form solution for the uplift capacity is obtained with no requirement of any charts or tables. Empirical relations using available literature are proposed for expressing critical embedment ratio and computation of net uplift capacity. The results are compared with a set of experimental data for 28 cases, ranging from loose to dense Cohesionless Soil up to maximum embedment ratio of 40, vis-à-vis available theoretical solutions. The proposed method leads to the predictions that are in good agreement with the experimental results. It further demonstrates the successful application of Kötter’s equation in the estimation of uplift capacity of pile anchors.
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Uplift Capacity of Pile Anchors in Cohesionless Soil
Deep Foundations and Geotechnical In Situ Testing, 2010Co-Authors: V. B. Deshmukh, D. M. Dewaikar, Deepankar ChoudhuryAbstract:An analysis of uplift capacity of pile anchors in Cohesionless Soil is proposed in which Kotter’s equation is employed to obtain the distribution of Soil reaction on the axisymmetric failure surface, assumed to be the frustum of a cone with a characteristic angle of inclination with the pile-Soil interface. A closed form solution for the uplift capacity of pile anchor is obtained with no requirement of any charts or tables. The results are compared with experimental data for a total 28 cases, ranging from loose to dense Cohesionless Soil, with maximum embedment ratio of 40, vis-a-vis available theoretical solutions. The proposed method leads to the predictions that are very close to the experimental results in 75% cases and this demonstrates the successful application of Kotter’s equation for the estimation of the uplift capacity of pile anchors.
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Analysis of rectangular and square anchors in Cohesionless Soil
International Journal of Geotechnical Engineering, 2010Co-Authors: V. B. Deshmukh, D. M. Dewaikar, Deepankar ChoudhuryAbstract:AbstractHorizontal anchors are widely used in civil engineering projects to resist uplift loads. A few theories are available for predicting uplift capacity of rectangular/square anchors. The theoretical methods suggested by Meyerhof and Adams and Murray and Geddes estimated the uplift capacity of rectangular/square with significant errors. An analytical method based on Kotter's equation is proposed for estimating the net uplift capacity of a horizontal rectangular/square in Cohesionless Soil. Application of Kotter's equation gives distribution of Soil reaction on the failure surface, which is assumed to be the frustum of a trapezoid with a characteristic angle of inclination with the horizontal. A closed form solution for the uplift capacity is obtained with no requirement of any charts or tables.
D. M. Dewaikar - One of the best experts on this subject based on the ideXlab platform.
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Uplift Capacity of Horizontal Strip Anchors in Cohesionless Soil
Geotechnical and Geological Engineering, 2011Co-Authors: V. B. Deshmukh, D. M. Dewaikar, Deepankar ChoudharyAbstract:This paper presents the details of the theoretical analysis of net uplift capacity of horizontal strip anchor in Cohesionless Soil using Kötter’s equation. A plane failure surface inclined at a characteristic angle with the ground surface is assumed. Results obtained using the proposed method are compared with the available experimental results of 30 cases for dense to loose Cohesionless Soil, with the maximum embedment ratio of 8. It is observed that the proposed method leads to the predictions of net uplift capacity of horizontal strip anchor that are very close to the experimental results in 93% cases. The comparison of results with available theoretical solutions shows that, proposed method makes better predictions for anchor embedment ratio less than 8 in dense Cohesionless Soils.
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Computations of uplift capacity of pile anchors in Cohesionless Soil
Acta Geotechnica, 2010Co-Authors: V. B. Deshmukh, D. M. Dewaikar, Deepankar ChoudhuryAbstract:A method of analysis for the uplift capacity of pile anchors in Cohesionless Soil is proposed using Kötter’s equation that facilitates computation of the distribution of Soil reaction on the axis-symmetric failure surface, which is assumed to be the frustum of a cone with a characteristic angle of inclination with the pile–Soil interface. A closed-form solution for the uplift capacity is obtained with no requirement of any charts or tables. Empirical relations using available literature are proposed for expressing critical embedment ratio and computation of net uplift capacity. The results are compared with a set of experimental data for 28 cases, ranging from loose to dense Cohesionless Soil up to maximum embedment ratio of 40, vis-à-vis available theoretical solutions. The proposed method leads to the predictions that are in good agreement with the experimental results. It further demonstrates the successful application of Kötter’s equation in the estimation of uplift capacity of pile anchors.
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Uplift Capacity of Pile Anchors in Cohesionless Soil
Deep Foundations and Geotechnical In Situ Testing, 2010Co-Authors: V. B. Deshmukh, D. M. Dewaikar, Deepankar ChoudhuryAbstract:An analysis of uplift capacity of pile anchors in Cohesionless Soil is proposed in which Kotter’s equation is employed to obtain the distribution of Soil reaction on the axisymmetric failure surface, assumed to be the frustum of a cone with a characteristic angle of inclination with the pile-Soil interface. A closed form solution for the uplift capacity of pile anchor is obtained with no requirement of any charts or tables. The results are compared with experimental data for a total 28 cases, ranging from loose to dense Cohesionless Soil, with maximum embedment ratio of 40, vis-a-vis available theoretical solutions. The proposed method leads to the predictions that are very close to the experimental results in 75% cases and this demonstrates the successful application of Kotter’s equation for the estimation of the uplift capacity of pile anchors.
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Analysis of rectangular and square anchors in Cohesionless Soil
International Journal of Geotechnical Engineering, 2010Co-Authors: V. B. Deshmukh, D. M. Dewaikar, Deepankar ChoudhuryAbstract:AbstractHorizontal anchors are widely used in civil engineering projects to resist uplift loads. A few theories are available for predicting uplift capacity of rectangular/square anchors. The theoretical methods suggested by Meyerhof and Adams and Murray and Geddes estimated the uplift capacity of rectangular/square with significant errors. An analytical method based on Kotter's equation is proposed for estimating the net uplift capacity of a horizontal rectangular/square in Cohesionless Soil. Application of Kotter's equation gives distribution of Soil reaction on the failure surface, which is assumed to be the frustum of a trapezoid with a characteristic angle of inclination with the horizontal. A closed form solution for the uplift capacity is obtained with no requirement of any charts or tables.
Musharraf Zaman - One of the best experts on this subject based on the ideXlab platform.
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On the concept of characteristic states of Cohesionless Soil and constitutive modeling.
Soils and Foundations, 1991Co-Authors: M. Omar Faruque, Musharraf ZamanAbstract:ABSTRACT The concepts of two characteristic states and their representation as characteristic state lines in the stress space are introduced to describe volumetric behavior of Cohesionless Soil during shearing. The first characteristic state line represents the state of Cohesionless Soil at failure, while the second characteristic line represents the state at which the rate of volumetric strain momentarily vanishes as the Soil passes from the compressive mode of deformation to the dilative mode of deformation during shearing. Explicit forms of the two characteristic state lines in the stress space are proposed and used to develop a constitutive model based on the framework of plasticity theory. The general forms of the characteristic state lines are verified using drained shear test data for a fine sand. Stress-strain and volumetric-axial strain responses are predicted using the proposed model and good correlations are observed with experimental data.
Masato Saitoh - One of the best experts on this subject based on the ideXlab platform.
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Inclined single piles under vertical loadings in Cohesionless Soil
Acta Geotechnica, 2020Co-Authors: Chandra Shekhar Goit, Masato Saitoh, Takumi Igarashi, Shun SasakiAbstract:Physical-scaled model testing under 1 g conditions is carried out in obtaining the vertical response of fixed head floating-inclined single piles embedded in dry sand. Practical pile inclinations of 5° and 10° besides a vertical pile (0°) subjected to static and dynamic vertical pile head loadings are considered. To account for the effects of Soil nonlinearity as well as the Soil–pile interface nonlinearity on the response of piles, a range of low-to-high magnitude of pile head displacements is considered for the static case while a varying amplitude of harmonic accelerations for a wide range of frequencies is considered for the dynamic case. Experimental results are obtained in the form of pile head stiffnesses and strains generated in the pile under both the static and dynamic loadings. Results suggest that the nonlinear behavior of Soil as well as the nonlinearity generated at the interface between the Soil and the pile as the result of applied loading considerably affect the response of piles. The Soil–pile interface nonlinearity that governs the slippage of pile shows a clear influence on the pile head stiffnesses by providing two distinct values of stiffnesses corresponding to the push and the pull directional movement of piles; the two values are significantly different. Axial and bending strains generated in the piles show expected dependency on the amplitude of applied loading; the pile head-level bending strain increases almost linearly with the increase in the angle of pile inclination.
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single pile under vertical vibrations in Cohesionless Soil
Geotechnique, 2017Co-Authors: Chandra Shekhar Goit, Masato SaitohAbstract:The vertical response of a fixed-head floating single pile embedded in sand is obtained experimentally under 1g conditions. Specifically, pile head stiffnesses and axial strains generated along the...
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Model tests and numerical analyses on horizontal impedance functions of inclined single piles embedded in Cohesionless Soil
Earthquake Engineering and Engineering Vibration, 2013Co-Authors: Chandra Shekhar Goit, Masato SaitohAbstract:Horizontal impedance functions of inclined single piles are measured experimentally for model Soil-pile systems with both the effects of local Soil nonlinearity and resonant characteristics. Two practical pile inclinations of 5° and 10° in addition to a vertical pile embedded in Cohesionless Soil and subjected to lateral harmonic pile head loadings for a wide range of frequencies are considered. Results obtained with low-to-high amplitude of lateral loadings on model Soil-pile systems encased in a laminar shear box show that the local nonlinearities have a profound impact on the horizontal impedance functions of piles. Horizontal impedance functions of inclined piles are found to be smaller than the vertical pile and the values decrease as the angle of pile inclination increases. Distinct values of horizontal impedance functions are obtained for the ‘positive’ and ‘negative’ cycles of harmonic loadings, leading to asymmetric force-displacement relationships for the inclined piles. Validation of these experimental results is carried out through three-dimensional nonlinear finite element analyses, and the results from the numerical models are in good agreement with the experimental data. Sensitivity analyses conducted on the numerical models suggest that the consideration of local nonlinearity at the vicinity of the Soil-pile interface influence the response of the Soil-pile systems.
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effect of local nonlinearity in Cohesionless Soil on optimal radius minimizing fixed head pile bending by inertial and kinematic interactions
Acta Geotechnica, 2010Co-Authors: Masato SaitohAbstract:This study presents the effects of a local nonlinearity in Cohesionless Soil upon the optimal radius minimizing the bending strains of a vertical, cylindrical fixed-head pile embedded in a layered Soil stratum in a Soil–pile–structure system where the kinematic interaction dominates. The seismic deformation method (SDM) with discretized numerical models is applied since the SDM is a static numerical method that can easily consider realistic conditions of layered Soil strata and the nonlinearity of the Soil. In the numerical models, the local nonlinearity of the Soil in the vicinity of the pile is represented by subgrade springs having bi-linear skeleton curves with a simple hysteretic loop. Various amplitudes of the lateral displacements of the Soil and the lateral forces at the head of the pile are considered as numerical parameters. The results of parametric analyses reveal the presence of an optimal pile radius that locally minimizes the bending strains of the piles under strong nonlinearity of the Soil, and the optimal pile radius tends to increase as the degree of nonlinearity increases. Criteria are presented for predicting the increment in the optimal radius of Soil–pile–structure systems under strong nonlinearity in the Soil.