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Articles 185461 - 185490 of 196880

Full-Text Articles in Engineering

Campano-Lucano Earthquake, November 1980, Italy, Strong Motion Data Related To Local Site Conditions, A. Fels, A. Pugliese, F. Muzzi Apr 1981

Campano-Lucano Earthquake, November 1980, Italy, Strong Motion Data Related To Local Site Conditions, A. Fels, A. Pugliese, F. Muzzi

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

When the 23 November 1980 earthquake struck the south of Italy a network of strong motion recorders was in operation. The earthquake triggered 21 stations. The network is composed by 168 stations spread all over the country following statistical criterion, see Taccarino and Zaffiro, 1973. The paper presents the results of the records obtained at 6 of 21 stations together with the available geological information of the sites where the stations were located.

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Session 8: Final Comments By Moderator, K. Arulanandan Apr 1981

Session 8: Final Comments By Moderator, K. Arulanandan

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.

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Seismic Response Of Subsurface Ground With Use Of Measured Underground Acceleration, T. Iwasaki, K. Kawashima, Y. Takagi Apr 1981

Seismic Response Of Subsurface Ground With Use Of Measured Underground Acceleration, T. Iwasaki, K. Kawashima, Y. Takagi

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The seismic response of subsurface ground is investigated based on the measured underground acceleration records at three sites around the Tokyo Bay induced by several moderate earthquakes, Variations of maximum accelerations with respect to depth are described in both horizontal and vertical components, and Amplification of acceleration in underground is presented in terms of frequency response function, Correlations of the underground accelerations between theoretical calculation and actual records are also discussed.

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Different Magnitude-Epicentral Intensity Relations And Estimation Of Maximum Ground Acceleration, U. Chandra Apr 1981

Different Magnitude-Epicentral Intensity Relations And Estimation Of Maximum Ground Acceleration, U. Chandra

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

For an earthquake of magnitude 7.0 or larger, different published relations between magnitude, M, and epicentral intensity, I0, yield I0 values which may differ from each other by as much as one intensity unit or more. This implies an uncertainty of a factor of about 2 in the estimation of maximum ground acceleration. New empirical relations between M and I0 are derived using the revised estimates of I0 for several earthquakes. Suitability of some of the commonly used M - I0 relations for the estimation of maximum ground acceleration is examined by deriving acceleration-distance curves for …

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Analysis Of Stresses In Seismically Induced Shallow Slope Failures, Luis E. Vallejo, Lawrence M. Peszek Apr 1981

Analysis Of Stresses In Seismically Induced Shallow Slope Failures, Luis E. Vallejo, Lawrence M. Peszek

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

An analysis of the stresses induced by a combination of static and seismic forces on the failure surface of shallow soil slope instabilities is presented. The geometry of the failures, either shallow planar of finite length or shallow rotational, is taken into consideration in the analysis. The stress induced by a combination of the above forces is found to be greater for the planar than for the rotational ones. Therefore, at limit equilibrium conditions, the former will predominate. Field measurements of the geometry of shallow soil slope failures corroborate the theoretical findings.

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Discussion On "Zonation Of Central U.S. Earthquake Sources" By G. L. Hempen, Dinesh C. Gupta Apr 1981

Discussion On "Zonation Of Central U.S. Earthquake Sources" By G. L. Hempen, Dinesh C. Gupta

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.

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Discussions, Umesh Chandra Apr 1981

Discussions, Umesh Chandra

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.

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Program Of The Conference, Multiple Authors Apr 1981

Program Of The Conference, Multiple Authors

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.

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Opening Remarks, Shamsher Prakash Apr 1981

Opening Remarks, Shamsher Prakash

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.

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Opening Ceremonies - Images, Multiple Authors Apr 1981

Opening Ceremonies - Images, Multiple Authors

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.

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Participants, Multiple Participants Apr 1981

Participants, Multiple Participants

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.

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Shear Moduli And Damping Of Cohesive Soils Under Earthquake Loads, Wen-Yao Hu, Tian-Long Wang Apr 1981

Shear Moduli And Damping Of Cohesive Soils Under Earthquake Loads, Wen-Yao Hu, Tian-Long Wang

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

To investigate the dynamic properties of soils under earthquake loading conditions, a series of cyclic triaxial compression tests vas carried out on undisturbed saturated samples of cohesive soils from Tianjin. It has come to the conclusion that variation of damping ratio, as well as shear modulus, with strain amplitude may be expressed by an empirical formula. Its normalized form can be shown by a family of curves or a band zone with shrunken ends. New empirical equations used for evaluating elastic or initial shear modulus G0 and maximum shear stress τmax have been suggested. For the two parameters, …

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The Effects Of Time Dependent Stress-Path On The Plastic And Elastic Deformation Of Sand And Clay Soils Subjected To Dynamic Loading, G. Y. Baladi, T. Goitom, Rodney Lentz Apr 1981

The Effects Of Time Dependent Stress-Path On The Plastic And Elastic Deformation Of Sand And Clay Soils Subjected To Dynamic Loading, G. Y. Baladi, T. Goitom, Rodney Lentz

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Cylindrical cyclic loading tests were used to study the effects of time dependent stress path on the plastic and elastic deformations of sand and clay soil samples. The test materials were obtained from the subgrade of existing highway pavements located throughout the state of Michigan. Approximately, 25 cylindrical soil samples (13.5 cm long, 5.5 cm in diameter) were tested under repeated loading conditions using different hydrostatic confining pressures and several time dependent stress-paths. In all tests, the first invariant of the stress tensor was cycled between two constant values and the first invariant of the stress deviator tensor was increased …

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Determination Of Dynamic Shear Modulus Of Soils From Static Strength, Y. S. Chae, W. C. Au, Y. C. Chiang Apr 1981

Determination Of Dynamic Shear Modulus Of Soils From Static Strength, Y. S. Chae, W. C. Au, Y. C. Chiang

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

A correlation study between the dynamic shear modulus obtained from the resonant column technique and the static strength obtained from the undrained triaxial compression test is described. The materials studied were a uniform sand, a non-active fine silty clay and a highly-active bentonite clay treated with additives to increase the range for static and dynamic shear strength of the soils. It is noted that a linear relationship exists between the dynamic shear modulus, except for those soil specimens having very low strength, independent of test parameters. Using linear regression analysis, empirical equations for predicting the maximum dynamic shear modulus from …

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Analysis Of Variation Of Poisson's Ratio With Depth Of Soil, Pan Fulan Apr 1981

Analysis Of Variation Of Poisson's Ratio With Depth Of Soil, Pan Fulan

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Through field tests on clay, soft soil, sand soil, and cl93 loam etc., we find: l) Propagating velocity of elastic wave of homogeneous soil is not a constant, but a function of depth. 2) Poisson's ratio is not a constant either. It increases with the increase of depth. 3)The ratio of a lateral compressive stress to vertical compressive stress acted upon an element at different depth is not a constant either. With the increase of depth, the lateral compressive stress tends to be equal to the vertical compressive stress step by step. Test results of four types of soil are …

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Dynamic Shear Modulus Of Soft Silt, H. Y. Fang, R. C. Chaney, N. S. Pandit Apr 1981

Dynamic Shear Modulus Of Soft Silt, H. Y. Fang, R. C. Chaney, N. S. Pandit

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This paper presents the geotechnical properties of soft silt obtained from the Greater Shanghai Region of the People's Republic of China. Fundamental correlations of shear modulus, damping ratio, shear stress, shear strain with varying consolidation pressures are determined in the laboratory by cyclic simple shear tests. A comparison is made between laboratory test results, in situ cross-hole test results and the building code data proposed by the Shanghai Municipal Bureau. Finally, a comparison of the laboratory data on Shanghai silt with other published data on sands and clays is presented and discussed.

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Strain-Rate Dependent Shear Modulus Of San Francisco Bay Mud, William M. Isenhower, Kenneth H. Stokoe Apr 1981

Strain-Rate Dependent Shear Modulus Of San Francisco Bay Mud, William M. Isenhower, Kenneth H. Stokoe

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The effects of shearing strain amplitude and shearing strain rate on the shear modulus of normally consolidated specimens of San Francisco Bay Mud were studied with a specially constructed torsional shear/resonant column device. Torsional shear measurements were performed at excitation frequencies of 0.03, 0.1, 0.3, and 1.0 Hz and were followed by a resonant column measurement at the same strain amplitude. This testing sequence was conducted at constant values of shearing strain amplitude over the range from 0.001 to 0.1 percent. From these measurements the dependency of shear modulus on shearing strain rate and amplitude was studied. Shear modulus was …

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Load, Deformation And Strength Behavior Of Soils Under Dynamic Loadings, Marshall L. Silver Apr 1981

Load, Deformation And Strength Behavior Of Soils Under Dynamic Loadings, Marshall L. Silver

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The state of the art is summarized for the evaluation of the stress, strain and strength properties of soils in terms of appropriate test equipment, test procedures and the presentation of test results in both the laboratory and the field. Different testing requirements for measuring soil properties for l) design and analysis problems and 2) for constitutive property modeling are compared and recommendations on minimum test result reporting requirements are given. In addition, methods for overcoming equipment and test procedure limitations are presented. The importance of combining field and laboratory test results is stressed and ways to make more extensive …

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Dynamic Deformation Characteristics Of A Soft Clay, B. A. Andréasson Apr 1981

Dynamic Deformation Characteristics Of A Soft Clay, B. A. Andréasson

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The shear modulus of a soft, high-plastic clay under dynamic loading conditions was studied. The initial shear modulus was determined by cross-hole and down-hole tests in-situ and by resonant column tests in the laboratory. The reduction of shear modulus with increasing shear strain amplitude was determined in-situ by dynamic loading screw-plate tests and in the laboratory by high amplitude resonant column tests. Field and laboratory test results are compared.

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Constitutive Equations For Sands And Overconsolidated Clays Under Dynamic Loads Based On Elasto-Plasticity, F. Oka, H. Washizu Apr 1981

Constitutive Equations For Sands And Overconsolidated Clays Under Dynamic Loads Based On Elasto-Plasticity, F. Oka, H. Washizu

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This paper is concerned with the constitutive equations of the sands and overconsolidated clays under cyclic loads. The constitutive equations are derived, based on the theory of plasticity and real stress-strain behavior of soils, The non-associated flow rule is applied to the derivation of the equations. The derived equations can explain the mechanical behavior of overconsolidated clays and sands under cyclic stresses and have nine soil parameters, and are applicable to liquefaction analysis.

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The Cyclic Loading Behavior Of Grouted Sand, J. L. Rosenfarb, R. E. Hackman Apr 1981

The Cyclic Loading Behavior Of Grouted Sand, J. L. Rosenfarb, R. E. Hackman

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

A two-phased static and dynamic laboratory investigation of the behavior of a silicate grout stabilized sand has been undertaken. Through the use of load-controlled cyclic triaxial testing the dynamic strength, stiffness, and deformation characteristics have been assessed as a function of mix design, confinerrent level and loading history. Comparisons between static and dynamic properties are provided.

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Cyclic Simple Shear Behavior Of Fine Grained Soils, R. Dyvik, T. F. Zimmie, P. Schimelfenyg Apr 1981

Cyclic Simple Shear Behavior Of Fine Grained Soils, R. Dyvik, T. F. Zimmie, P. Schimelfenyg

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Consolidated, constant volume (CCV), cyclic laboratory shear tests were performed on marine clay soils. The Norwegian Geotechnical Institute (NGI) direct simple shear device, modified for cyclic loading (square wave) capabilities, was used for these tests. Two clays were investigated; a natural undisturbed Gulf of Mexico clay and a reconstituted Pacific Illite. The cyclic shear tests were performed with two way loading (complete stress reversal). Models are presented to predict the pore pressure behavior during a cyclic test, or to predict the strain or pore pressure behavior of tests with varying cyclic shear stress levels. A unique relationship between shear strain …

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Residual Pore Pressure And Deformation Behavior Of Soil Samples Under Variable Cyclic Loading, C. S. Chang Apr 1981

Residual Pore Pressure And Deformation Behavior Of Soil Samples Under Variable Cyclic Loading, C. S. Chang

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This paper describes a method for predicting both residual pore pressure and residual deformation of anisotropically consolidated undrained samples under variable cyclic loading. The approach of this method is phenomenologically relating normalized number of cycles and pore pressure ratio. This relationship is then extended for predicting residual pore pressures under variable cyclic loading. Residual deformation is predicted by considering the effective stress change due to the build-up of residual pore pressure. Comparisons are made between predicted and measured residual pore pressures and deformations of samples under variable cyclic loading.

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Cyclic Loading Response Of Cohesive Soils Using A Bounding Surface Plasticity Model, Y. F. Dafalias, L. R. Herrman, A. Anandarajah Apr 1981

Cyclic Loading Response Of Cohesive Soils Using A Bounding Surface Plasticity Model, Y. F. Dafalias, L. R. Herrman, A. Anandarajah

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The concept of the bounding surface in plasticity theory has been used to develop a general three-dimensional constitutive model for cohesive soils within the framework of critical state soil mechanics. The present work focuses on the response of the above model under cyclic loading conditions. It is shown mainly qualitatively and partially quantitatively, that the model predicts in detailed form a material response which does agree with observed experimental behavior under undrained and drained loading conditions at any overconsolidation ratio and for different cyclic deviatoric stress amplitudes.

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Interface Element For Propagation In Layered Media, V. R. Gadhinglajkar, R. M. Belkune, C. K. Ramesh Apr 1981

Interface Element For Propagation In Layered Media, V. R. Gadhinglajkar, R. M. Belkune, C. K. Ramesh

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

An interface element which accounts for the relative displacement between two layers through its stiffness properties and loss of energy through its damping properties has been developed. lts behaviour under static, free vibration, transient load and wave propagation in layered media has been studied.

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Liquefaction Analysis Of Sand Deposits Based On Cyclic Elasto-Piasticity, F. Oka, T. Murase Apr 1981

Liquefaction Analysis Of Sand Deposits Based On Cyclic Elasto-Piasticity, F. Oka, T. Murase

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The one-dimentional liquefaction analysis of sand deposits is performed by using the theory of two-phase mixture and the elasto-plastic constitutive equations of sand that can describe the dynamic dilatancy effect of soil under cyclic loading. The analytical results obtained by finite difference method explain well the dynamic behavior of sand deposits including liquefaction phenomena. Especially, the stress path which is particular to liquefaction is presented by considering a horizontally confined condition.

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Site Analysis For Seismic Soil Liquefaction Potential, James B. Forrest, John M. Ferritto, George Wu Apr 1981

Site Analysis For Seismic Soil Liquefaction Potential, James B. Forrest, John M. Ferritto, George Wu

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Field penetration data and cyclic laboratory test data are presented for evaluating the seismically induced soil liquefaction potential at a waterfront site. Dynamic split-spoon penetration recordings and three types of quasistatic friction cone probings were made. The friction cones were the standard mechanical cone, the electric cone, and the piezometric cone. The latter penetrometer has a porous element near the tip which permits measurement of pore water pressures generated during penetration. By interrupting penetration, the rate of pore pressure dissipation can be recorded, so an estimate of soil permeability can also be derived. Undisturbed samples were taken using an Osterberg …

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Influence Of Fines On Evaluating Liquefaction Of Sand By Cpt, S. G. Zhou Apr 1981

Influence Of Fines On Evaluating Liquefaction Of Sand By Cpt, S. G. Zhou

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

A method of evaluating liquefaction potential of sand by Static Cone Penetration Test (CPT) was firstly developed basing on the field tests over Tangshan earthquake area and then confirmed by the test result in Haicheng earthquake. However, it showed considerable deviations when the method was used over Lutai area. The author holds that this outcome is mainly due to the difference between the soil characteristics of Lutai and Tangshan, i.e.. the former contains much more fine particles than the latter. Thus the method should be modified according to the fine particles content of the soil. A preliminary method of modification …

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Potential For Liquefaction Due To Construction Blasting, J. H. Long, E. R. Ries, A. P. Michalopoulos Apr 1981

Potential For Liquefaction Due To Construction Blasting, J. H. Long, E. R. Ries, A. P. Michalopoulos

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

A method based on laboratory cyclic triaxial and torsional tests of undisturbed soil samples has been developed to predict the potential for liquefaction due to buried charges, such as those used in construction blasting. The results of a test blasting program conducted at a construction site are presented. The case history yielded data on particle velocities and blast induced porewater pressure changes.

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Uniform Cycles In Earthquakes: A Statistical Study, A. Haldar Apr 1981

Uniform Cycles In Earthquakes: A Statistical Study, A. Haldar

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

In the evaluation of soil behavior due to earthquake motions, uniform intensity load cycles are frequently used instead of irregular-patterned loadings generated during actual earthquakes. A statistical conversion procedure is discussed in this paper based on results available in the literature. The actual irregular stress-time history produced by an earthquake can be represented by uniform amplitude cyclic stresses, although there may be considerable uncertainty associated with them. The statistical relationship proposed here between the earthquake magnitude and the equivalent uniform stress cycles is somewhat different from the relationship commonly used in practice. It is observed in this study that this …

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