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Seismic bearing capacity factors of shallow strip footings
52A
Influence of dynamic loads See also: 911207
Measurements were made at a number of sawmills on natural soils or sand or clay bases. Based on analysis of field data, several alternatives are proposed for the log frame foundation, for which economics are compared.
911407
Seismic stability analysis of rockfill dams Kikusawa, M Geoteclmiqne V40, N2, June 1990, P201-210 Pseudo-static analyses of a typical rockfill dam with an impervious core are presented, using the limit equilibrium method and an upper bound limit analysis. The rigid-plastic finite element approach is employed. Safety factors in limit equilibrium, stability factors in limit analysis, and seismic coefficients (critical accelerations) are discussed. Charts are presented to determine critical seismic coefficient for a given slope,or critical slope angle for a specified seismic coefficient. 911408
Seismic bearing capacity factors of shallow strip footings Sarma, S K; lossifelis, I S Geotecimiqne V40, N2, June 1990, P265-273 An analysis is presented which includes the effects of inertia of the soil mass and of surcharge, as well as that of the structure, on bearing capacity of shallow strip footings. Bearing capacity factors are calculated using a method based on the limit equilibrium technique of slope stability analysis with inclined slices. Effects of inertia can usually be accommodated within safety factors for acceleration less than 0.1g. Charts are presented for determination of critical acceleration factor, to compute possible footing deformation during large earthquakes. 911409
Impedances of soil layer with boundary zone. Technical note Novak, M; Han, Y C J Geoteck Eugng Div ASCE V116, N6, June 1990, P10081014 Damping and soil stiffness used in dynamic analysis are usually calculated using linear theory, but are affected by soil nonlinearity at high strain, contact deficiences, and foundation installation disturbance. To account for this in an approximate manner, the inclusion of a weaker zone, an annulus of softer soil, around the foundation was proposed (Novak and Sheta, 1980). Although this analysis takes no account of the mass of the weakened zone, its effects were included in further modifications. The effect of this mass on the solution of the dynamic problem is discussed. 911410
Design of log-frame foundations Pyatetskii, V M; Lapin, S K; Kuntsevich, A O; Tishchenko, V B Soil Meek Found Eugng V26, NS, Sept-Oct 1989, P189-193 Modern log frames develop significant dynamic Ioadings which are transferred to their foundations. Vibration and continuous settlement of sawmill buildings has been reported.
911411
Penetrability and strem-wave analysis of a large steel pipe pile Sandanbata, I; Yamaguchi, Y; Uchida, A: Matsumoto, K Drivability of Piles, Proc Discussiou Session 14, 12tk International Conference on Soil Mechanics and Fomulation Engineering, Rio de Jneiro, 13-18 August 1989 VI, P79-82. Publ Tokyo: JSSMFE, 1989 A steel pipe pile of diameter l.Sm and length 64.8m was driven offshore in water depth 20m using a diesel hammer. Sea bed stratigraphy was layered clays, sands, and gravel. Driving stresses and accelerations were measured. Stress wave analysis using the method of two point strain measurements (Matsumoto et al, 1988) was used to calculate displacements and driving energy transmitted to the pile, and results compared with measured values.
911412
Measuring cases of phenomena of pile driving by using aeeelerometer Uto, K; Fuyuki, M; Miyaji, A; Ninomiya, K, lwashita, F: Omori, H; Ikeda, M Dri~abik'ty of Piles, Proe Discussion Session 14, 12tk International Conference on Soil Mechanics and Foundation Engi~ering, Rio de Jo~eiro, 13-18 August 1989 VI, P83-86. Publ Tokyo: JSSMFE, 1989 A system for digital integration of measured acceleration during pile driving to determine velocity and displacement has been under development for a number of years. It can be used with one dimensional wave equation analysis to predict dynamic bearing capacity. The measuring system is illustrated and problems of its development described. The results from the DPA (Dynamic Piling Analyzer) show precision and reproducibility.
911413
Seismic design of Reinforced Earth retajnln~, wails - the contribution of finite element analysis Segrestin, P; Bastick, M J Proc International Geotecimical Symposium on Tkeory and Practice of Eartk Reinforcement, Fukuoka Kyusim, 5-7 October 1988 t'577-582. Publ Rotterdam: A A Baikema, 1988 Following experiments on small and half scale models and observations of real structures with concrete facings and steel reinforcing elements, dynamic finite element analysis using the code SUPERFLUSH has been undertaken. Influences of foundation soil stiffness, maximum acceleration and type of accelerogram on distribution of tensile forces with depth were examined. Calculations are compared to field measurements. A practical design method for internal stability is developed.
© 1991 Pergamon Press pic. Reproduction not permitted
Influence of dynamic loads See also: 911207
Measurements were made at a number of sawmills on natural soils or sand or clay bases. Based on analysis of field data, several alternatives are proposed for the log frame foundation, for which economics are compared.
911407
Seismic stability analysis of rockfill dams Kikusawa, M Geoteclmiqne V40, N2, June 1990, P201-210 Pseudo-static analyses of a typical rockfill dam with an impervious core are presented, using the limit equilibrium method and an upper bound limit analysis. The rigid-plastic finite element approach is employed. Safety factors in limit equilibrium, stability factors in limit analysis, and seismic coefficients (critical accelerations) are discussed. Charts are presented to determine critical seismic coefficient for a given slope,or critical slope angle for a specified seismic coefficient. 911408
Seismic bearing capacity factors of shallow strip footings Sarma, S K; lossifelis, I S Geotecimiqne V40, N2, June 1990, P265-273 An analysis is presented which includes the effects of inertia of the soil mass and of surcharge, as well as that of the structure, on bearing capacity of shallow strip footings. Bearing capacity factors are calculated using a method based on the limit equilibrium technique of slope stability analysis with inclined slices. Effects of inertia can usually be accommodated within safety factors for acceleration less than 0.1g. Charts are presented for determination of critical acceleration factor, to compute possible footing deformation during large earthquakes. 911409
Impedances of soil layer with boundary zone. Technical note Novak, M; Han, Y C J Geoteck Eugng Div ASCE V116, N6, June 1990, P10081014 Damping and soil stiffness used in dynamic analysis are usually calculated using linear theory, but are affected by soil nonlinearity at high strain, contact deficiences, and foundation installation disturbance. To account for this in an approximate manner, the inclusion of a weaker zone, an annulus of softer soil, around the foundation was proposed (Novak and Sheta, 1980). Although this analysis takes no account of the mass of the weakened zone, its effects were included in further modifications. The effect of this mass on the solution of the dynamic problem is discussed. 911410
Design of log-frame foundations Pyatetskii, V M; Lapin, S K; Kuntsevich, A O; Tishchenko, V B Soil Meek Found Eugng V26, NS, Sept-Oct 1989, P189-193 Modern log frames develop significant dynamic Ioadings which are transferred to their foundations. Vibration and continuous settlement of sawmill buildings has been reported.
911411
Penetrability and strem-wave analysis of a large steel pipe pile Sandanbata, I; Yamaguchi, Y; Uchida, A: Matsumoto, K Drivability of Piles, Proc Discussiou Session 14, 12tk International Conference on Soil Mechanics and Fomulation Engineering, Rio de Jneiro, 13-18 August 1989 VI, P79-82. Publ Tokyo: JSSMFE, 1989 A steel pipe pile of diameter l.Sm and length 64.8m was driven offshore in water depth 20m using a diesel hammer. Sea bed stratigraphy was layered clays, sands, and gravel. Driving stresses and accelerations were measured. Stress wave analysis using the method of two point strain measurements (Matsumoto et al, 1988) was used to calculate displacements and driving energy transmitted to the pile, and results compared with measured values.
911412
Measuring cases of phenomena of pile driving by using aeeelerometer Uto, K; Fuyuki, M; Miyaji, A; Ninomiya, K, lwashita, F: Omori, H; Ikeda, M Dri~abik'ty of Piles, Proe Discussion Session 14, 12tk International Conference on Soil Mechanics and Foundation Engi~ering, Rio de Jo~eiro, 13-18 August 1989 VI, P83-86. Publ Tokyo: JSSMFE, 1989 A system for digital integration of measured acceleration during pile driving to determine velocity and displacement has been under development for a number of years. It can be used with one dimensional wave equation analysis to predict dynamic bearing capacity. The measuring system is illustrated and problems of its development described. The results from the DPA (Dynamic Piling Analyzer) show precision and reproducibility.
911413
Seismic design of Reinforced Earth retajnln~, wails - the contribution of finite element analysis Segrestin, P; Bastick, M J Proc International Geotecimical Symposium on Tkeory and Practice of Eartk Reinforcement, Fukuoka Kyusim, 5-7 October 1988 t'577-582. Publ Rotterdam: A A Baikema, 1988 Following experiments on small and half scale models and observations of real structures with concrete facings and steel reinforcing elements, dynamic finite element analysis using the code SUPERFLUSH has been undertaken. Influences of foundation soil stiffness, maximum acceleration and type of accelerogram on distribution of tensile forces with depth were examined. Calculations are compared to field measurements. A practical design method for internal stability is developed.
© 1991 Pergamon Press pic. Reproduction not permitted