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Seismic earth thrust against massive building walls
49A effect of dump thickness on dynamic response are also determined. Assumptions made in the analysis are compared to monitoring data to check their validity.
901388 FHctiou of seismically induced deformation of Liyutan Dam, Talwan, by means of cyclic triaxial testing and finite element analysis Shi, L P; Towhata, I; Wieland, M Comput Geotecli V7, N3, 1989, P205-222 The concept of Lee (1974) is used in calculation of allowable permanent seismically induced deformation of a planned dam. The strain potential of the sand fill was determined from cyclic triaxial tests. Major revisions were made to the original analysis by assuming permanent deformation to result from gravitational forces and reducing the equivalent elastic modulus by the least squares method. Results indicate the dam is stable against maximum credible earthquake, and that softening of the sand beneath the crest has a large effect on settlement of the crest.
901389 Analytic solutions for soil-structure interaction in layered media Liou, G S Eartliq Engng Struct Dynam VIS, N5, July 1988, P667-686 Soil structure interaction in a layered medium with a rigid lower boundary and a cylindrical cavity on the surface is considered. The total system is divided into a structural domain, interior soil domain (projection of the cavity down to bedrock), and an exterior soil domain. Harmonic displacement or stress time history is imposed on the surface of the cylindrical cavity. Analytical solutions for the soil domains are generated independently, using an infinite series of Fourier components. The impedance matrix at the interface between the structure and soil is generated using the analytical solutions and combined with the finite element model of the structure. 901390 Soil-structure interaction experiment using impulse response Mita, A; Yoshida, K; Kumagai, S; Shioya, K Eartltq £ngng Soil Dynam V18, NS, July 1989, P727-744 An experimental method using a finite soil model with no special treatment on its boundaries is used to simulate the semiinfiniteness of an actual soil medium in soil structure interaction problems. The characteristics of the transient response to impulse loading at the surface are used to derive impedance functions and effective input motions for surface and embedded foundations. Results are compared to those from the direct boundary integral equation method and the hybrid approach.
901391 Seismic stability of concrete gravity dams Leger, P; Katsouli, M Earthq Engng Struct Dynam VI8, N6, Aug 1989, P889-902 Time domain analyses using nonlinear contact elements at the dam-foundation interface are used to determine dynamic stability and uplift response of gravity dams on elastic foundations, Relative interface displacement, percent of base not in contact (PBNC) and compressive stress at dam heel or toe are used to monitor seismic stability. Nonlinear behaviour at the interface reduces seismic response of the system and allows more rational and economic design assumptions. PBNC is the critical stability parameter, except for very flexible foundations where displacement must be considered.
901392 Earthquake analysis with generalized plasticity model for saturated soils Desai, C S; Galagoda, H M Earthq Engng Struct Dynam VIS, Nr, Aug 1989, P903-919 Finite element analysis of the response of a structure-saturated porous soil system to earthquake loading is presented. A plasticity based constitutive model for anisotropic behaviour of soils and generalized Biot theory for dynamic nonlinear response of porous materials are employed. Linear and nonlinear analyses were carried out. Differences in the predicted magnitudes and zones of concentration of pore pressure, and magnitudes of horizontal and vertical displacement and shear stress are discussed.
901393 Vertical vibration of a circular footing on a saturated halfspace Kassir, M K; Bandyopadhyay, K K; Xu, J lnt J Engng Sci V27, N4, 1989, P353-361 Dynamic response of a circular footing on the surface of a liquid filled porous elastic half space and subject to oscillatory vertical motion is reduced to a Fredholm integral of the second kind. Frequency dependent impedance functions for the medium, a dense water-saturated sand, are computed, and the importance of pore pressure dissipation and variations in permeability and Poisson's ratio of the medium on response is demonstrated. The presence of groundwater should be taken into account for dynamic analysis of surface structures.
901394 Seismic earth thrust against massive building walls Navarro, C; Samartin, A lnt J Num Anal Meth Geomech VI3, N4, July-Aug 1989, P347-357 In design of embedded structures, the problem of earth thrust for a massive building in a seismic environment must be addressed. Inertial and kinematic soil-structure interactions are considered by modelling the soil and structure together and solving the problem in the frequency domain using the computer code FLUSH. The horizontal component of seismic thrust is much greater than that calculated using the Mononabe-Okabe theory. Design and practical implications are discussed. 901395 Centrifuge study of faulting effects on tunnel Burridge, P B; Scott, R F; Hall, J F
J Geotecil Engng Die ASCE Vl15, N7, July 1989, P949-967 Effect of fault movement on a tunnel in soil crossing an active fault is hard to assess. Scaled centrifuge tests were carried out on a finite length model tunnel. Deflections and stresses in the tunnel caused by fault displacement or differential earthquake movement across the fault were quantified. Results were used to calibrate a one dimensional finite element model of soil tunnel interaction. Output from the numerical analysis was used to predict behaviour of an essentially infinite length tunnel for design purposes. Effects of tunnel length are examined. 901396 Computation of the seismic stability of rock wedges Ghosh, A; Haupt, W
Rock Mech Rock Engng 1/22, N2, April-June 1989, P109-125 The concept of Newmark to compute permanent displacements under seismic loading has been combined with conventional limit analysis to compute displacement of a rock wedge. The computer program developed can take into account water
© 1990 Pergamon Press plc. Reproduction not permitted
901388 FHctiou of seismically induced deformation of Liyutan Dam, Talwan, by means of cyclic triaxial testing and finite element analysis Shi, L P; Towhata, I; Wieland, M Comput Geotecli V7, N3, 1989, P205-222 The concept of Lee (1974) is used in calculation of allowable permanent seismically induced deformation of a planned dam. The strain potential of the sand fill was determined from cyclic triaxial tests. Major revisions were made to the original analysis by assuming permanent deformation to result from gravitational forces and reducing the equivalent elastic modulus by the least squares method. Results indicate the dam is stable against maximum credible earthquake, and that softening of the sand beneath the crest has a large effect on settlement of the crest.
901389 Analytic solutions for soil-structure interaction in layered media Liou, G S Eartliq Engng Struct Dynam VIS, N5, July 1988, P667-686 Soil structure interaction in a layered medium with a rigid lower boundary and a cylindrical cavity on the surface is considered. The total system is divided into a structural domain, interior soil domain (projection of the cavity down to bedrock), and an exterior soil domain. Harmonic displacement or stress time history is imposed on the surface of the cylindrical cavity. Analytical solutions for the soil domains are generated independently, using an infinite series of Fourier components. The impedance matrix at the interface between the structure and soil is generated using the analytical solutions and combined with the finite element model of the structure. 901390 Soil-structure interaction experiment using impulse response Mita, A; Yoshida, K; Kumagai, S; Shioya, K Eartltq £ngng Soil Dynam V18, NS, July 1989, P727-744 An experimental method using a finite soil model with no special treatment on its boundaries is used to simulate the semiinfiniteness of an actual soil medium in soil structure interaction problems. The characteristics of the transient response to impulse loading at the surface are used to derive impedance functions and effective input motions for surface and embedded foundations. Results are compared to those from the direct boundary integral equation method and the hybrid approach.
901391 Seismic stability of concrete gravity dams Leger, P; Katsouli, M Earthq Engng Struct Dynam VI8, N6, Aug 1989, P889-902 Time domain analyses using nonlinear contact elements at the dam-foundation interface are used to determine dynamic stability and uplift response of gravity dams on elastic foundations, Relative interface displacement, percent of base not in contact (PBNC) and compressive stress at dam heel or toe are used to monitor seismic stability. Nonlinear behaviour at the interface reduces seismic response of the system and allows more rational and economic design assumptions. PBNC is the critical stability parameter, except for very flexible foundations where displacement must be considered.
901392 Earthquake analysis with generalized plasticity model for saturated soils Desai, C S; Galagoda, H M Earthq Engng Struct Dynam VIS, Nr, Aug 1989, P903-919 Finite element analysis of the response of a structure-saturated porous soil system to earthquake loading is presented. A plasticity based constitutive model for anisotropic behaviour of soils and generalized Biot theory for dynamic nonlinear response of porous materials are employed. Linear and nonlinear analyses were carried out. Differences in the predicted magnitudes and zones of concentration of pore pressure, and magnitudes of horizontal and vertical displacement and shear stress are discussed.
901393 Vertical vibration of a circular footing on a saturated halfspace Kassir, M K; Bandyopadhyay, K K; Xu, J lnt J Engng Sci V27, N4, 1989, P353-361 Dynamic response of a circular footing on the surface of a liquid filled porous elastic half space and subject to oscillatory vertical motion is reduced to a Fredholm integral of the second kind. Frequency dependent impedance functions for the medium, a dense water-saturated sand, are computed, and the importance of pore pressure dissipation and variations in permeability and Poisson's ratio of the medium on response is demonstrated. The presence of groundwater should be taken into account for dynamic analysis of surface structures.
901394 Seismic earth thrust against massive building walls Navarro, C; Samartin, A lnt J Num Anal Meth Geomech VI3, N4, July-Aug 1989, P347-357 In design of embedded structures, the problem of earth thrust for a massive building in a seismic environment must be addressed. Inertial and kinematic soil-structure interactions are considered by modelling the soil and structure together and solving the problem in the frequency domain using the computer code FLUSH. The horizontal component of seismic thrust is much greater than that calculated using the Mononabe-Okabe theory. Design and practical implications are discussed. 901395 Centrifuge study of faulting effects on tunnel Burridge, P B; Scott, R F; Hall, J F
J Geotecil Engng Die ASCE Vl15, N7, July 1989, P949-967 Effect of fault movement on a tunnel in soil crossing an active fault is hard to assess. Scaled centrifuge tests were carried out on a finite length model tunnel. Deflections and stresses in the tunnel caused by fault displacement or differential earthquake movement across the fault were quantified. Results were used to calibrate a one dimensional finite element model of soil tunnel interaction. Output from the numerical analysis was used to predict behaviour of an essentially infinite length tunnel for design purposes. Effects of tunnel length are examined. 901396 Computation of the seismic stability of rock wedges Ghosh, A; Haupt, W
Rock Mech Rock Engng 1/22, N2, April-June 1989, P109-125 The concept of Newmark to compute permanent displacements under seismic loading has been combined with conventional limit analysis to compute displacement of a rock wedge. The computer program developed can take into account water
© 1990 Pergamon Press plc. Reproduction not permitted