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Effects of rotational stiffness in building foundations
72A 872220 Effects of rotational stiffness in building foundations Moore, P J; Styles, J R: Clancy, P Proc 8th Southeast Asian Geotechnical Conference, Kuala Lumpur, Alalaysia, 11-15 March 1985 V1. P335-40. Publ Kuala Lumpur. Organishtg Committee. 1986
872224 Behaviour of a raft foundation on improved soil and rock Toh. C T: Ooi. T A: Ting, W H Proc 8th Southeast Asian Geotechnical Conference, Kuala Lumpur, Alalaysia, 11-15 March 1985 V1. P364-80. Publ Kuala Lumpur: Organising Committee, 1986
A brief theoretical assessment is made of the rotational stiffness of footings, and results of moment loading tests for surface and embedded model footings in sand are presented. It is demonstrated that rotational stiffness may vary by several orders of magnitude, depending on footing size and the nature of the geological medium. It may be increased by repeated moment or vertical loading, by embedding the footing, increasing vertical stress on the footing or decreasing the magnitude of the applied moment.
Measured and predicted settlements of a raft foundation, sited partly over rock and partly over soil which has been improved by dynamic compaction, are presented. Two- and threedimensional finite element analyses were used for the predictions. Predicted and measured results were in reasonable agreement, and differences might be attributable to uncertainty of the bedrock profile. Results suggest dynamic soil compaction produced a uniform soil of properties similar to those assumed in the analysis.
872221 Behaviour of dry sands in steel pipe piles Kisheda, H; Uesugi, M: Morita, S Proc 8th Southeast Asian Geotechnical Conference, Kuala Lumpur, Malaysia, 11-15 L~larch 1985 VI, P3/41-47. Publ Kuala Lumpur." Organising Committee, 1986 Full scale laboratory tests investigated the behaviour of dry sand placed in steel pipe piles, diameter 306-789mm. The tests involved lowering or raising the bottom surface of the sand or pushing down the top surface. Loads required to displace the sand and movements of the sand plug surface were measured. Tests indicate the dilatancy of the sand increases the horizontal stress on the inner surface of the pile, especially at low confining stress. A proposed theory explains observed behaviour and may be used to calculate plugging effects of open ended steel pipe piles. 872222 Comparative study of the design methods for pile foundations with specific reference to the dry docks of Cochin shipyard Babu, D R; Jose, B T Proc 8th Southeast Asian Geotechnical Conference, Kuala Lumpur, Malaysia, 11-15 ~Vlarch 1985 VI, P3/48-57. Publ Kuala Lumpur: Organising Committee. 1986 Over 4000 cast-in-situ piles were driven through sand into clay at the Cochin shipyard, India, and, of these, I1 were load tested. Field measurements of pile capacity were compared with those predicted by the six most suitable analyses, chosen from the many available. These were Whitaker's method (based on shear strength parameters), Sanglerat's and Vander Veen's method (SCPT), Brom's and the Japanese method (SPT) and Hiley's formula (based on pile driving formulae). The Japanese method and Sanglerat's method proved the most reliable. 872223 Predictions of prestressed concrete pile capacity in Bangkok stiff clay and clayey sand Sambhanbdharaksa, S; Pitupakorn, W Proc 8th Southeast Asian Geotechnical Conference, Kuala Lumpur, Malaysia, 11-15 March 1985 V1, P3/58-63. Publ Kuala Lumpur: Organising Committee, 1986
872225 Pile foundations in limestone areas of Malaysia Chan, S F; Hong, L P Proc 8th Southeast Asian Geotechnieal Conference, Kuala Lumpur, Malaysia, 11-15 March 1985 VI, P4.17-28. Publ Kuala Lumpur: Organising Committee, 1986 The properties of limestone bedrock and its overburden soils in areas of Malaysia are presented, The limestone areas show complex surface topography due to karstic features, which can result in drastic changes in bedrock properties over very short distances. The most common foundations consist of endbearing piles supported on bedrock. Thorough subsurface investigation is necessary for a proper understanding of subsurface problems. Current foundation practices and case histories of failures are described. 872226 Foundations for the Pan Pacific Hotel on pinnacled and cavernous limestone Mitchell, J M Proc 8th Southeast Asian Geotechnical Conference, Kuala Lumpur, Malaysia, 11-15 March 1985 V1, P4/29-44. Publ Kuala Lumpur." Organising Committee, 1986 This 30-storey building was sited over pinnacled and cavernous limestone. Initial site investigation showed the limestone to be very irregular with a 'cliff beneath the proposed site, and further confirmatory borings showed a 17m overhang, necessitating more modification to the proposed foundation design. Large diameter bored piles were used where the limestone was relatively shallow and barrettes, or rectangular piles, where the limestone was deep. No piles were placed on the overhang. Full scale loading tests were undertaken before the design was finalised. Site investigation is of top priority in such difficult ground.
872227 Piled foundation in limestone formation lbrahim, O B; Fang, H T - Proc 8th Southeast Asian Geotechnical Conference, Kuala Two methods were used to predict the bearing capacity of Lumpur, Malaysia, 11-15 March 1985 V1, P4/45-52. Publ driven precast concrete piles in the Bangkok area. The static Kuala Lumpur: Organising Committee, 1986 formulae was used to calculate capacities of piles driven Foundation problems arise in karstic limestone areas due to through soft clay into stiff clay. Similar calculations were the very variable topography and rock properties. Three case made using skin friction calculations from SPT N values, and this method was also used to predict capacities of piles in histories and their specific problems are described: driven conclayey sands. Maximum errors of predicted values were about crete piles; driven steel H-piles; and jacked concrete piles. The 25%, but the static formula is believed to give the better guidelines drawn up in Malaysia for foundations in such areas are presented. analysis. ~: 1986 Pergamon Journals Ltd. Reproduction not permitted
872224 Behaviour of a raft foundation on improved soil and rock Toh. C T: Ooi. T A: Ting, W H Proc 8th Southeast Asian Geotechnical Conference, Kuala Lumpur, Alalaysia, 11-15 March 1985 V1. P364-80. Publ Kuala Lumpur: Organising Committee, 1986
A brief theoretical assessment is made of the rotational stiffness of footings, and results of moment loading tests for surface and embedded model footings in sand are presented. It is demonstrated that rotational stiffness may vary by several orders of magnitude, depending on footing size and the nature of the geological medium. It may be increased by repeated moment or vertical loading, by embedding the footing, increasing vertical stress on the footing or decreasing the magnitude of the applied moment.
Measured and predicted settlements of a raft foundation, sited partly over rock and partly over soil which has been improved by dynamic compaction, are presented. Two- and threedimensional finite element analyses were used for the predictions. Predicted and measured results were in reasonable agreement, and differences might be attributable to uncertainty of the bedrock profile. Results suggest dynamic soil compaction produced a uniform soil of properties similar to those assumed in the analysis.
872221 Behaviour of dry sands in steel pipe piles Kisheda, H; Uesugi, M: Morita, S Proc 8th Southeast Asian Geotechnical Conference, Kuala Lumpur, Malaysia, 11-15 L~larch 1985 VI, P3/41-47. Publ Kuala Lumpur." Organising Committee, 1986 Full scale laboratory tests investigated the behaviour of dry sand placed in steel pipe piles, diameter 306-789mm. The tests involved lowering or raising the bottom surface of the sand or pushing down the top surface. Loads required to displace the sand and movements of the sand plug surface were measured. Tests indicate the dilatancy of the sand increases the horizontal stress on the inner surface of the pile, especially at low confining stress. A proposed theory explains observed behaviour and may be used to calculate plugging effects of open ended steel pipe piles. 872222 Comparative study of the design methods for pile foundations with specific reference to the dry docks of Cochin shipyard Babu, D R; Jose, B T Proc 8th Southeast Asian Geotechnical Conference, Kuala Lumpur, Malaysia, 11-15 ~Vlarch 1985 VI, P3/48-57. Publ Kuala Lumpur: Organising Committee. 1986 Over 4000 cast-in-situ piles were driven through sand into clay at the Cochin shipyard, India, and, of these, I1 were load tested. Field measurements of pile capacity were compared with those predicted by the six most suitable analyses, chosen from the many available. These were Whitaker's method (based on shear strength parameters), Sanglerat's and Vander Veen's method (SCPT), Brom's and the Japanese method (SPT) and Hiley's formula (based on pile driving formulae). The Japanese method and Sanglerat's method proved the most reliable. 872223 Predictions of prestressed concrete pile capacity in Bangkok stiff clay and clayey sand Sambhanbdharaksa, S; Pitupakorn, W Proc 8th Southeast Asian Geotechnical Conference, Kuala Lumpur, Malaysia, 11-15 March 1985 V1, P3/58-63. Publ Kuala Lumpur: Organising Committee, 1986
872225 Pile foundations in limestone areas of Malaysia Chan, S F; Hong, L P Proc 8th Southeast Asian Geotechnieal Conference, Kuala Lumpur, Malaysia, 11-15 March 1985 VI, P4.17-28. Publ Kuala Lumpur: Organising Committee, 1986 The properties of limestone bedrock and its overburden soils in areas of Malaysia are presented, The limestone areas show complex surface topography due to karstic features, which can result in drastic changes in bedrock properties over very short distances. The most common foundations consist of endbearing piles supported on bedrock. Thorough subsurface investigation is necessary for a proper understanding of subsurface problems. Current foundation practices and case histories of failures are described. 872226 Foundations for the Pan Pacific Hotel on pinnacled and cavernous limestone Mitchell, J M Proc 8th Southeast Asian Geotechnical Conference, Kuala Lumpur, Malaysia, 11-15 March 1985 V1, P4/29-44. Publ Kuala Lumpur." Organising Committee, 1986 This 30-storey building was sited over pinnacled and cavernous limestone. Initial site investigation showed the limestone to be very irregular with a 'cliff beneath the proposed site, and further confirmatory borings showed a 17m overhang, necessitating more modification to the proposed foundation design. Large diameter bored piles were used where the limestone was relatively shallow and barrettes, or rectangular piles, where the limestone was deep. No piles were placed on the overhang. Full scale loading tests were undertaken before the design was finalised. Site investigation is of top priority in such difficult ground.
872227 Piled foundation in limestone formation lbrahim, O B; Fang, H T - Proc 8th Southeast Asian Geotechnical Conference, Kuala Two methods were used to predict the bearing capacity of Lumpur, Malaysia, 11-15 March 1985 V1, P4/45-52. Publ driven precast concrete piles in the Bangkok area. The static Kuala Lumpur: Organising Committee, 1986 formulae was used to calculate capacities of piles driven Foundation problems arise in karstic limestone areas due to through soft clay into stiff clay. Similar calculations were the very variable topography and rock properties. Three case made using skin friction calculations from SPT N values, and this method was also used to predict capacities of piles in histories and their specific problems are described: driven conclayey sands. Maximum errors of predicted values were about crete piles; driven steel H-piles; and jacked concrete piles. The 25%, but the static formula is believed to give the better guidelines drawn up in Malaysia for foundations in such areas are presented. analysis. ~: 1986 Pergamon Journals Ltd. Reproduction not permitted