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Uplift behaviour of pile anchors subjected to lateral cyclic loading. Technical note
378A 1.28m and a 1.28/0.68m ring were used. Soil modulus values were determined for design of the 55m diameter ring-shaped raft foundation of the tower. Effects of soaking, repeated loading, and size of tested area on settlement were evaluated. Responses of rings and full plates are compared. 936360 Axial response of tapered piles in cohesive frictional ground Kodikara, J K; Moore, I D J Geotech Engng Div A S C E Vl19, N4, April 1993, P675-693 With tapered piles, side resistance continues to increase with axial deformation because of the forced additional radial expansion of the ground. Operational characteristics of such piles have been identified on the basis of experimental observations. A simplified theoretical model for piles with small taper angles is developed, which gives accurate prediction of the development of side friction in pile field tests. Limited parametric analysis indicates the tapered pile may be a more economical design option than the parallel pile under many practical conditions. 936361 Constitutive model for cyclic behavior of clays. Ih Applications Desai, C S; Wathugala, G W; Matlock, H J Geotech Engng Div A S C E Vl19, N4, April 1993, P730-748 A Hierarchical Single Surface model for cohesive soils was developed in a companion paper. The model has been used to simulate various stages of field behaviour of piles. Stresses, strains, and pore pressure were monitored during driving of instrumented piles in Sabine clay. The model is introduced in a general finite element procedure which allows dynamic analysis of porous soil media and gives good predictions of measured responses. The total procedure will have many applications in dynamic soil structure interaction problems. 936362 Settlement analysis of layered soil systems by stiffness method. Technical note Conte, E; Dente, G J Geotech Engng Div A S C E Vl19, N4, April 1993. P780-785 Kausel and Roesset (1981) derived a relation between dynamic external loads and associated elastic displacements at the interfaces of a layer in horizontally stratified soil systems. This is used to analyse the behaviour of plane strain layered soils under static working load. The procedure is validated by comparison with published numerical solutions. The effect on settlement of a footing of the inclusion of a soft layer or a stiff layer at various depths in a uniform soil deposit is examined. 936363 Uplift behaviour of pile anchors subjected to lateral cyclic loading. Technical note Rao, S N; Prasad, Y V S N J Geotech Engng Div A S C E Vl19, N4, April 1993, P786-790 Piles on marine structures are usually subject to cyclic lateral forces. Resulting movement of the upper part of the pile can lead to reduction of skin friction and hence of uplift capacity. Laboratory model tests were carried out to investigate such effects. Short rigid piles showed reduction in lateral and pullout capacities as a result of cyclic lateral loading. Reduction in pullout capacity depends on deflection during lateral loading and embedment length/diameter ratio. If lateral deflection does not exceed 0.025-0.030 pile diameters, capacity loss is negligible.
936364 Interaction of axial and lateral pile responses. Technical note Anagostopoulos, C; Georgiadis, M J Geotech Engng Div ASCE V119, N4, April 1993, P793..798 In many applications, piles are subject to simultaneous axial and lateral loading. Current practice involves independent analysis of axial and lateral load effects. Laboratory model tests have been carried out to investigate any effects of lateral loading on axial pile displacements and stresses and influence of axial loading on lateral pile response. An interpretation of observed behaviour is attempted using nonlinear finite element analysis. Significant axial-lateral loading interaction was found.
936365 Soil disturbance due to installation of model piles and pile groups Shublaq, E W Soils Found F32, N4, Dec 1992, P17-26 Disturbance of Leighton Buzzard Sand due to the installation of single model piles or pile groups was examined. Changes in soil density were estimated on the basis of changes in sand thermal conductivity, measured using thermal probes. The piles, lm long and 40mm in diameter, were driven into medium-dense to dense air-dried sand. Effects of initial sand density, pile toe profile, and interpile spacing on disturbance were investigated. Various zones of compaction and loosening were found, below and beside the piles and within and outside of the periphery of the pile group.
936366 Three-dimensional bearing capacity analysis of foundations by use of a method of slices Narita, K; Yamaguchi, H Soils Found V32, N4, Dec 1992, P143-155 A conventional 3D analysis of the bearing capacity of square and rectangular footings is presented, using a method of slices with assumptions of curved sliding surfaces consisting of log spirals with different radii in the direction of the long axis of the footing base. Fundamental aspects of such 3D solutions are discussed, including accuracy, shape and extent of the sliding surfaces, and differences if different methods of slices are used. Bearing capacity factors are calculated to investigate the effects of shape, friction angle, and accuracy of superposition used in conventional bearing capacity formulae. Shape factors obtained are compared to others reported.
936367 Estimation of ultimate capacity of piles in the Utah region by dynamic methods Dixon, B G; Anderson, L R; Rahman, R; Keane, E Proc 28th Symposium on Engineering Geology and Geoteclmical Engineering, Boise, 1-3 April 1992 P458-472. Publ Pocatello: Idaho State University, 1992 Many different dynamic methods have been developed as alternatives to the expensive and time-consuming direct loading tests to predict the capacity of driven piles. Pile driving data and subsurface information were collected from eight pile load tests in the Salt Lake City area. Correlations are presented between load test results and predictions of 12 dynamic formulae, the wave equation analysis, and the Pile Driving Analyser (PDA).
© 1993 Pergamon Press Ltd. Reproduction not permitted
936364 Interaction of axial and lateral pile responses. Technical note Anagostopoulos, C; Georgiadis, M J Geotech Engng Div ASCE V119, N4, April 1993, P793..798 In many applications, piles are subject to simultaneous axial and lateral loading. Current practice involves independent analysis of axial and lateral load effects. Laboratory model tests have been carried out to investigate any effects of lateral loading on axial pile displacements and stresses and influence of axial loading on lateral pile response. An interpretation of observed behaviour is attempted using nonlinear finite element analysis. Significant axial-lateral loading interaction was found.
936365 Soil disturbance due to installation of model piles and pile groups Shublaq, E W Soils Found F32, N4, Dec 1992, P17-26 Disturbance of Leighton Buzzard Sand due to the installation of single model piles or pile groups was examined. Changes in soil density were estimated on the basis of changes in sand thermal conductivity, measured using thermal probes. The piles, lm long and 40mm in diameter, were driven into medium-dense to dense air-dried sand. Effects of initial sand density, pile toe profile, and interpile spacing on disturbance were investigated. Various zones of compaction and loosening were found, below and beside the piles and within and outside of the periphery of the pile group.
936366 Three-dimensional bearing capacity analysis of foundations by use of a method of slices Narita, K; Yamaguchi, H Soils Found V32, N4, Dec 1992, P143-155 A conventional 3D analysis of the bearing capacity of square and rectangular footings is presented, using a method of slices with assumptions of curved sliding surfaces consisting of log spirals with different radii in the direction of the long axis of the footing base. Fundamental aspects of such 3D solutions are discussed, including accuracy, shape and extent of the sliding surfaces, and differences if different methods of slices are used. Bearing capacity factors are calculated to investigate the effects of shape, friction angle, and accuracy of superposition used in conventional bearing capacity formulae. Shape factors obtained are compared to others reported.
936367 Estimation of ultimate capacity of piles in the Utah region by dynamic methods Dixon, B G; Anderson, L R; Rahman, R; Keane, E Proc 28th Symposium on Engineering Geology and Geoteclmical Engineering, Boise, 1-3 April 1992 P458-472. Publ Pocatello: Idaho State University, 1992 Many different dynamic methods have been developed as alternatives to the expensive and time-consuming direct loading tests to predict the capacity of driven piles. Pile driving data and subsurface information were collected from eight pile load tests in the Salt Lake City area. Correlations are presented between load test results and predictions of 12 dynamic formulae, the wave equation analysis, and the Pile Driving Analyser (PDA).
© 1993 Pergamon Press Ltd. Reproduction not permitted