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Dynamic response of vertically loaded nonlinear pile foundations
154A 874199 Behaviour of laterally loaded piles in permafrost Neukirchner, R J; Nixon, J F J Geotech Engng Div ASCE Vl13, NI, Jan 1987, Pl-14 Long term lateral loading of piles in permafrost has been analysed. It was assumed that frozen soils exhibit secondary (uniform) creep behaviour. Computer predictions of the performance of piles in permafrost and thawed soils are compared. Comparison is also made with available laboratory and field test data. Procedures have been developed to predict the time taken for laterally loaded piles in permafrost to attain a unifo~vn creep rate, to assist planning and evaluation of further test programs. 874200 Analysis of laterally loaded piles in permafrost Neukirchner, R J J Geoteeh Engng Div ASCE VlI3, N1, Jan 1987, P15-29 A relatively simple analytical procedure, based on the model proposed by Nixon (1984), has been developed, which analyses a laterally loaded pile in permafrost as a strip footing in a viscous medium. The procedure is applicable to free-headed piles subject to long-term lateral loads or moments in a frozen soil exhibiting secondary creep. Creep rate, maximum pile movement and shear force can be evaluated. Results are verified by comparison with computer analyses and field tests. 874201 Full-scale cyclic dynamic lateral pile responses Ting, J M J Geotech Engng Div ASCE Vl13, N1, Jan 1987, P30-43 In the design of vertical piles subject to lateral dynamic loads, lateral soil resistance is often represented as a series of discrete springs, each with its own p-y curve, which is based on static load test results. Results of cyclic dynamic pile tests in sands yielded a series of dynamic p-y curves, which are compared with those recommended by the API(1982). Partial liquefaction of the soil around the pile head and the occurrence of a pile-soil gap were seen during dynamic testing. Current oil industry recommendations overestimate soil stiffness, particularly at large deflections. Dynamic stiffness and damping capacity appear more dependent on nonlinear behaviour than frequency of excitation. 874202 Dynamic response of vertically loaded nonlinear pile foundations Nogami, T; Konagai, K J Geotech Engng Div ASCE Vl13, N2, Feb 1987, P147-160 The nonlinear effects in the vertical response are assumed in this study to result from slippage of the pile from the soil. In order to demonstrate the capability of the present formulations and to see the effects of nonlinearity on the dynamic response of pile foundati0ns~ pile foundation responses are computed for both harmonic and transient load. Various observations are made based upon the computed results
874203 Stress wave monitoring for a friction pile during driving: a new analysis procedure Nishida, Y; Sekiguchi, H; Matsumoto, T Soils Found V26, N4, Dec 1986, Pl11-126 A pile driving analysis, the modified rigid-plastic approach and a stress wave monitoring technique have been developed for friction piles in clays and argillaceous rocks. Firstly, the generation and propagation of stress waves in piles due to
dynamic shaft resistance is discussed, along ~ith the concept of the 'suddenly mobilized localised skin friction'. An attempt is then made to incorporate a realistic, elastic-perfectly plastic constitutive law for the shaft interface into this framework. The validity of the analysis is examined against laboratory tests on a friction pile in mudstone. 874204 Non-dimensional probahilistic coefficients for laterally loaded piles Ruiz, S E Struct Safety V4, N1, Oct 1986, P41-47 Non-dimensional probabilistic curves in terms of displacement and flexural movement coefficient are presented under the hypothesis of linear variation of the secant soil modulus of the soil reaction with depth, to enable rapid estimations of probabilistic responses of laterally loaded-piles. The soil properties are expressed in terms of p-y curves and the lateral head loads are considered to be random. Values of probabilistic nondimensional coefficients are given for typical cases of pites having constant bending stiffness and driven in Soft saturated clays. Auth. 874205 Design of raft footings on expansive soil Mitchell, P W Trans Inst Engrs Australia Civ Engng VCE24. N4, Not" 1986. P328-336 Soil movements caused by soil moisture changes can cause heave or edge settlement of raft foundations. The foundation must be sufficiently stiff to limit the magnitude of deformation to that which can be accepted by the superstructure. Based on theoretical examination of expansive soil movement, moisture diffusion, soil structure interaction and a soil classification scheme, together with observation of field performance, a standardised design table has been produced. 874206 Earth pressure in the sliding soil mass Fukuoka, M; Imano, M; Hada, M Proc 4th International Conference and Field Workshop on Landslides, Japan,23-31 Aug 1985 P245-250. Publ Tokyo: Japan Landslide Society, 1985 In order to investigate earth pressure on a bridge pier erected in a landsliding soil mass. a model test was performed in a tilted sand box. Earth pressure was measured with satisfactory precision. The landslide earth pressure acted not just on the surface of the shaft near the sliding surface, but on its entire surface. The testing method and results are presented though research work is still in progress. 874207 Probabilistic measures in Dutch offshore geoteclmics De Queleij, L Proc IABSE Symposium, Safety and QaaliD" Assurance of Civil Engineering Structures, Tokyo, 1986 Pl17-124. Publ Zurich: IABSE, 1986 A review is presented of the main geotechnical applications of probabilistic methods with respect to the quality control of the design, construction and maintenance of the storm surge barrier in the south western part o f the Netherlands. Attention is paid respectively to the overall fault-tree of the barrier, reliability analysis of the stability of the pier foundation including the economic optimisation, and risk analysis of flow slides due to scour at the edges of the seabottom protection. Auth.
,© 1987 Pergamon Journals Ltd. Reproduction not permitted
874203 Stress wave monitoring for a friction pile during driving: a new analysis procedure Nishida, Y; Sekiguchi, H; Matsumoto, T Soils Found V26, N4, Dec 1986, Pl11-126 A pile driving analysis, the modified rigid-plastic approach and a stress wave monitoring technique have been developed for friction piles in clays and argillaceous rocks. Firstly, the generation and propagation of stress waves in piles due to
dynamic shaft resistance is discussed, along ~ith the concept of the 'suddenly mobilized localised skin friction'. An attempt is then made to incorporate a realistic, elastic-perfectly plastic constitutive law for the shaft interface into this framework. The validity of the analysis is examined against laboratory tests on a friction pile in mudstone. 874204 Non-dimensional probahilistic coefficients for laterally loaded piles Ruiz, S E Struct Safety V4, N1, Oct 1986, P41-47 Non-dimensional probabilistic curves in terms of displacement and flexural movement coefficient are presented under the hypothesis of linear variation of the secant soil modulus of the soil reaction with depth, to enable rapid estimations of probabilistic responses of laterally loaded-piles. The soil properties are expressed in terms of p-y curves and the lateral head loads are considered to be random. Values of probabilistic nondimensional coefficients are given for typical cases of pites having constant bending stiffness and driven in Soft saturated clays. Auth. 874205 Design of raft footings on expansive soil Mitchell, P W Trans Inst Engrs Australia Civ Engng VCE24. N4, Not" 1986. P328-336 Soil movements caused by soil moisture changes can cause heave or edge settlement of raft foundations. The foundation must be sufficiently stiff to limit the magnitude of deformation to that which can be accepted by the superstructure. Based on theoretical examination of expansive soil movement, moisture diffusion, soil structure interaction and a soil classification scheme, together with observation of field performance, a standardised design table has been produced. 874206 Earth pressure in the sliding soil mass Fukuoka, M; Imano, M; Hada, M Proc 4th International Conference and Field Workshop on Landslides, Japan,23-31 Aug 1985 P245-250. Publ Tokyo: Japan Landslide Society, 1985 In order to investigate earth pressure on a bridge pier erected in a landsliding soil mass. a model test was performed in a tilted sand box. Earth pressure was measured with satisfactory precision. The landslide earth pressure acted not just on the surface of the shaft near the sliding surface, but on its entire surface. The testing method and results are presented though research work is still in progress. 874207 Probabilistic measures in Dutch offshore geoteclmics De Queleij, L Proc IABSE Symposium, Safety and QaaliD" Assurance of Civil Engineering Structures, Tokyo, 1986 Pl17-124. Publ Zurich: IABSE, 1986 A review is presented of the main geotechnical applications of probabilistic methods with respect to the quality control of the design, construction and maintenance of the storm surge barrier in the south western part o f the Netherlands. Attention is paid respectively to the overall fault-tree of the barrier, reliability analysis of the stability of the pier foundation including the economic optimisation, and risk analysis of flow slides due to scour at the edges of the seabottom protection. Auth.
,© 1987 Pergamon Journals Ltd. Reproduction not permitted