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1991

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Articles 421 - 450 of 505

Full-Text Articles in Civil and Environmental Engineering

Dynamic Earth Pressure Distribution Behind Retaining Walls, D. M. Dewaikar Mar 1991

Dynamic Earth Pressure Distribution Behind Retaining Walls, D. M. Dewaikar

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

The point of application of dynamic active thrust and its distribution are computed using the method of slices and criterion of maximization of overturning moment of the active thrust. The computations show that point of application of the dynamic thrust is significantly influenced by such factors as wall friction and acceleration coefficients. Horizontal accelerations coupled with positive vertical accelerations (acting downwards) have the effect of moving the point of application closer to the wall base. The combination of horizontal acceleration with negative vertical acceleration produces exactly the reverse effect and generates more overturning moments even though the magnitude of corresponding …

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Effective Stress Analysis Of A Sheet Pile Quaywall, Susumu Lai, Tomohiro Kameoka Mar 1991

Effective Stress Analysis Of A Sheet Pile Quaywall, Susumu Lai, Tomohiro Kameoka

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

In 1983, Nihonkai Chubu Earthquake of magnitude 7.7 hit northern part of Japan. The earthquake caused damage to quaywalls at Akita Port located about 100 km from the epicenter. The damage was associated with the liquefaction of backfill sand. In order to analyze the mechanism of the damage, soils are taken from the site for laboratory tests. The record of the earthquake motion is digitized. Based on these investigations, a two dimensional effective stress analysis is conducted. The model used in this study consists of a multiple virtual simple shear mechanisms oriented in arbitrary directions. The results of the effective …

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Seismic Design Of Rigid Underground Walls In New England, Cetin Soydemir Mar 1991

Seismic Design Of Rigid Underground Walls In New England, Cetin Soydemir

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

The Mononobe-Okabe equation is still widely used in design practice to estimate earthquake induced soil pressures against earth retaining structures without differentiation of the lateral yielding or non-yielding character of the structure. Where these structures are rigid and non-yielding because of structural restraints (e.g., basement walls, bridge abutments, underground transportation, hydraulic and sanitary structures) the use of Mononobe-Okabe equation would not be appropriate and would be generally unsafe. Alternate design recommendations are proposed, based on the results of recent analytical and experimental studies by other researchers, for a nominal design earthquake expected to be representative of the New England seismicity.

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Seismic Earth Pressures Against Structures With Restrained Displacements, P. Ortigosa, H. Musante Mar 1991

Seismic Earth Pressures Against Structures With Restrained Displacements, P. Ortigosa, H. Musante

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

A simplified kinematic method to compute seismic earth pressures against structures with restrained horizontal displacements is described. The retaining structure has a linear elastic behavior and the retained soil is considered linear as well as a nonlinear material. Seismic pressures for different maximum free field accelerations were obtained by applying free field horizontal displacements at the base of the interaction springs connecting the soil and the retaining structure. For perfectly rigid structures without horizontal displacements and linear retained materials, seismic pressures obtained with the simplified kinematic method are compared with those obtained using elastic models; for nonlinear retained soils comparisons …

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Stability Of Fiber Reinforced Sand Retaining Walls, Masami Fukuoka, Kakuhiro Nakayama, Shun-Ichi Lhara, Kiyohiro Okedoi, Ken-Ichirou Ozaki Mar 1991

Stability Of Fiber Reinforced Sand Retaining Walls, Masami Fukuoka, Kakuhiro Nakayama, Shun-Ichi Lhara, Kiyohiro Okedoi, Ken-Ichirou Ozaki

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

A ten meter high retaining wall made by sands reinforced with continuous fibers was constructed in 1988. Thickness of the retaining wall was 1 mat the top and 2.5 m at the bottom, and the slope was 63° at the face and 71° at the back. Earth pressure acting on the wall, displacements of the face, settlements of the fill and acceleration of the retaining wall were measured. During the construction, around the third height of the wall was displaced 15 cm in a forward direction. At the time of an earthquake, the values of the maximum horizontal acceleration at …

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Study And Design Of Earth Reinforced Structures Under Dynamic Efforts, Ammar Dhouib, Grant Knochenmus Mar 1991

Study And Design Of Earth Reinforced Structures Under Dynamic Efforts, Ammar Dhouib, Grant Knochenmus

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

This paper aims at giving a synthesis of recent design methods of earth reinforced structures submitted to dynamic actions. In the first instance, we intend to tackle a comparative study on scaled - down models and on real works in reinforced earth. This study is led by the finite elements method. Secondly, we propose a simple method to design reinforced earth structures.

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A Hybrid Model For Soil-Foundation Compliance, Chin-Hsu Lin, Teresa M. Adams Mar 1991

A Hybrid Model For Soil-Foundation Compliance, Chin-Hsu Lin, Teresa M. Adams

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

This paper describes a hybrid method that may be used to model the dynamic responses of multiple rectangular foundations resting on a homogeneous, viscoelastic stratum and excited by harmonic waves. The hybrid analysis described in this paper combines the dynamic stiffness and finite element methods. The method uses equivalent area disk loads for Green's functions at the soil surface. The dynamic stiffness method is used to obtain the stiffness matrix of the soil medium and the finite element method is used to obtain the stiffness matrix of surface foundations. The stiffness of the entire soil-structure system can be obtained using …

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A Hybrid Modeling Of Soil Structure Interaction Problems, Celso Romanel, Tribikram Kundu Mar 1991

A Hybrid Modeling Of Soil Structure Interaction Problems, Celso Romanel, Tribikram Kundu

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

A hybrid method is proposed in this research for dynamic soil-structure interaction analysis of embedded structures within a multilayered elastic half-space. A near field region, containing the structure and a portion of soil surrounding it, is modeled by finite elements while the far field formulation is obtained through the classical wave propagation theory based on the assumption that the actual scattered wave fields can be represented by a set of line sources located at a depth corresponding to the center of mass of the structure under investigation. Traction reciprocity between the two regions is satisfied exactly while displacement continuity across …

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Analysis Of Pile-Soil Dynamic Interaction By Combination Of Bem And Fem, Shiming Wu, Yuanqiang Cai, Yunmin Chen, Longzhu Chen Mar 1991

Analysis Of Pile-Soil Dynamic Interaction By Combination Of Bem And Fem, Shiming Wu, Yuanqiang Cai, Yunmin Chen, Longzhu Chen

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

A hybrid method, in which soil media is modeled by 3-D boundary elements and the pile by 1-D finite elements, for an analysis of dynamic pile-soil interaction is investigated. A new series of equations and an efficient method to deal with singularity of integrals are presented. Several effects including pile length, stiffness of the pile and surrounding soil on dynamic response are studied. Finally, the characteristics of impaired and intact piles are investigated and compared; and some case studies are presented.

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Behaviour Of Cyclically Loaded Model Piles In Soft Clay, R. D. Purkayastha, S. Dey Mar 1991

Behaviour Of Cyclically Loaded Model Piles In Soft Clay, R. D. Purkayastha, S. Dey

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

Instability studies on offshore piles has been carried out to a very limited extent. Cyclic loading resulting from wave action is a very common phenomenon for such piles. Continuous cycling {both vertical and lateral) presumably leads to substantial degradation in pile-soil response, the ultimate result of which could be disastrous. Over the last decade and a half, some work has been done to study the pile-soil interaction behaviour under repeated cyclic loading. This paper aims to highlight and discuss the salient features and the important observations of extensive model tests on piles subjected to vertical cyclic load. The degradation of …

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Dynamic Response Of Flexible Foundations On Multilayered Medium, Wang Fuming Mar 1991

Dynamic Response Of Flexible Foundations On Multilayered Medium, Wang Fuming

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

The dynamic response of flexible strip-foundations placed on a viscoelastic multi-layered medium under conditions of plane strain and subjected to harmonic excitation is studied in this paper. A semi-analytic model is developed to determine the dynamic flexibility matrix of the medium, and the spline finite element method is employed to treat the foundation. The two methods are appropriately combined through equilibrium and compatibility considerations at the soil-foundation interface. Numerical results describing the influence of the non-homogeneity of the soil medium on the compliance are presented, and the effects of the relative stiffness Kr on the foundation response are briefly discussed.

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Dynamic Response Of Foundations On Two-Parameter Media, A. Alvapplllai, M. O. Faruque, M. Zaman Mar 1991

Dynamic Response Of Foundations On Two-Parameter Media, A. Alvapplllai, M. O. Faruque, M. Zaman

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

A finite element algorithm is presented to analyze the dynamic response of rectangular foundations resting on an elastic medium. The foundation is modeled by rectangular thin plate elements and the supporting elastic medium is represented by the two parameter model proposed by Vlasov. The natural frequencies of the foundation-elastic medium are investigated. A parametric study is conducted to examine the effects of the edge and corner forces, that are accounted for in the two parameter model, on the dynamic response of a plate subjected to a moving vertical force.

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Earthquake Resistant Piles Reinforced With Ground Walls, Yoshiaki Nagataki, Hiroaki Senoo Mar 1991

Earthquake Resistant Piles Reinforced With Ground Walls, Yoshiaki Nagataki, Hiroaki Senoo

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

A method for reducing earthquake load acting on piles by means of ground walls installed around pile foundation is proposed. First, a shaking table test was carried out. Test specimens are 1/40 scale structural models, which consist of soil, piles and a building with or without ground walls. The pile head moment of the specimens with ground walls show only 60% of that of the specimens without the ground walls. An FEM analysis was carried out for both cases and the results were compared with the test results. The comparison showed a good agreement. Furthermore, a simplified calculation method is …

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Evaluation Of Seismic Soil-Structure Interaction (Ssi) By Different Approaches, Dan Mircea Ghiocel, Dan Ghiocel, Traian Mauna Mar 1991

Evaluation Of Seismic Soil-Structure Interaction (Ssi) By Different Approaches, Dan Mircea Ghiocel, Dan Ghiocel, Traian Mauna

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

The paper investigates the seismic SSI effects for rigid type structures. Structural response is computed by modal synthesis versus frequency response approach. The main aspects analysed are as follows: a) the seismic SSI effects on structural response; b) shortcomings in the current SSI computational procedure; c) seismic structure –soil-structure interaction (SSSI) effects on structural response of neighbouring heavy buildings. Two case studies are presented: a shearwell multistory building (SMB) on soft clay and a massive reactor building (RB). Seismic response quantities are accelerations, displacements, stresses, floor response spectra (FRS) and spectra amplification functions (SAF).

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Experimental Studies On An Embedded Soil-Structure Interaction In A Case Of Hard Supporting Ground, Tomoyuki Lnukai, Masanori Izumi, Tamio Lmazawa, Eisuke Tanimoto Mar 1991

Experimental Studies On An Embedded Soil-Structure Interaction In A Case Of Hard Supporting Ground, Tomoyuki Lnukai, Masanori Izumi, Tamio Lmazawa, Eisuke Tanimoto

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

In order to investigate the embedment effects exerted on the vibration behavior of reactor building, a series of tests is being carried out employing the use of a large-scale test model constructed on hard ground. This paper describes the embedment effects obtained from the forced vibration tests for the following items: 1) dynamic characteristics of soil-structure interaction system; 2) dynamic ground impedance; 3) soil pressure and so on.

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Experimental Studies On The Dynamic Behavior Of Soft Clay Ground-Structures Supported By Friction Pile Foundations, N. Mori, T. Kondo Mar 1991

Experimental Studies On The Dynamic Behavior Of Soft Clay Ground-Structures Supported By Friction Pile Foundations, N. Mori, T. Kondo

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

Recently, structures are often sited on a soft ground. So, a friction pile and a floating foundation are considered a possible and promising one. The object of this paper is to study the dynamic behavior of soft clay ground-structure supported by friction pile foundation on the basis of the shaking table test. Major results are as follows; 1) the residual settlement of structure resulting from decreasing the bearing capacity of the ground, wh1ch 1s caused by the accumulation of the excess pore water pressure, is larger than that of ground without structures. 2) The initial shear stress is a main …

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Lumped-Parameter Model For Foundation On Layer, John P. Wolf, Antonio Paronesso Mar 1991

Lumped-Parameter Model For Foundation On Layer, John P. Wolf, Antonio Paronesso

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

A lumped-parameter model to represent a disk on the surface of a layer built-in at its base vibrating in horizontal, vertical, rocking or torsional motions is presented. Eight frequency-independent real coefficients determine the springs, dampers and the mass of the lumped-parameter model with two internal degrees of freedom. These coefficients are specified for various ratios of the radius of the disk to the depth of the layer and for various Poisson's ratios. To derive the mechanical properties of the lumped-parameter a systematic procedure of curve-fitting of the dynamic-stiffness coefficient up to at least twice the fundamental frequency of the layer …

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Nonlinear Analysis Of Circular Plates On Nonlinear Foundation, Adel A. Mahmoud, Mohamed A. Nassar, Hazem M. Gheith Mar 1991

Nonlinear Analysis Of Circular Plates On Nonlinear Foundation, Adel A. Mahmoud, Mohamed A. Nassar, Hazem M. Gheith

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

Galerkin's procedure and the modified energy expression of Banerjee are used to obtain the central deflection of circular plates with linearly varying thicknesses, resting on a linear as well as a nonlinear elastic foundation. A new series formula for the deflection has been considered. The accuracy of the method has been tested for clamped plates with movable and immovable ends under uniform static patch loading. Graphical results are drawn for the central deflection for different end conditions, different plate thicknesses and different foundation properties. Comparison of the results are made with other known results and shows a good agreement in …

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Nonlinear Seismic Analysis Of Building - Foundation Soil Systems, M. Sobaih, A. Gabr, A. H. Mahmoud, M. M. Bahloul Mar 1991

Nonlinear Seismic Analysis Of Building - Foundation Soil Systems, M. Sobaih, A. Gabr, A. H. Mahmoud, M. M. Bahloul

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

This paper deals with the problem of nonlinear seismic analysis of building - foundation soil systems. The building considered is modeled as a shear - type building supported on the surface of homogeneous isotropic elastic half-space. The governing nonlinear equations of motion for the structure - soil system are solved in the time domain using the step-by-step linear acceleration method of analysis with Wilson-e modification. Different nonlinear models to simulate the behaviour of reinforced concrete under cyclic loading are used. A parametric study has been performed on a single story shear-type building with different natural frequencies supported on the surface …

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Numerical Simulation Of Shaking Table Test By Nonlinear Response Analysis Method, Mamoru Kanatani, Koichi Nishi, Jun-Ichi Touma, Masayuki Ohnami, Hiroyuki Namita Mar 1991

Numerical Simulation Of Shaking Table Test By Nonlinear Response Analysis Method, Mamoru Kanatani, Koichi Nishi, Jun-Ichi Touma, Masayuki Ohnami, Hiroyuki Namita

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

In this paper we described the results or numerical simulation or shaking table test on two dimensional soil-structure interation system to verify an application or newly developed nonlinear response analysis method. This code was a so-called U-W analysis method based on the deformation theory or saturated porous material proposed by Biot and constitutive relations to simulate the nonlinear characteristics or soils were induced by the elasto-plastic theory. Input material constants or soil were decided by referring the data or popular soil element test. Because the properties or soil were heavily dependent on confining pressure, then static and dynamic soil tests …

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Parametric Study Of Horizontal Permanent Displacement On Sand, H. V. Phuong Truong Mar 1991

Parametric Study Of Horizontal Permanent Displacement On Sand, H. V. Phuong Truong

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

Dynamic loading such as cyclic loading should be taken into account in designing shallow foundations for any dynamically related structures. Horizontal permanent displacement, which can occur at any time due to wind and/or wave and dynamic loads of moving vehicles, can significantly reduce the bearing capacity of the footing. Effects of dynamic soil properties, e.g. frequency, Poisson's ratio, Young's modulus, on the permanent displacement are considered and the assumption of the linear variation between deformation and cycles can be used to predict the long-term horizontal permanent displacement. Sensitivity analyses for both pure sliding and coupled rocking and sliding vibrations of …

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Pile Group Stiffness For Seismic Soil-Structure Interaction, Anshuli Arya, Anand S. Arya Mar 1991

Pile Group Stiffness For Seismic Soil-Structure Interaction, Anshuli Arya, Anand S. Arya

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

This paper deals with stiffnesses of pile groups based on single pile stiffness as worked out by Novak and Sharnouby (1983) using dynamic analysis. The interaction factors between two neighboring piles are used as those derived by Poulos (1971) statically but assumed to hold under dynamic situation at low frequencies such as involved in earthquakes. Pile groups of 4 to 32 piles in single circular ring and up to 60 piles in multiple rings as used under raft foundations of circular chimneys and overhead water tanks are accordingly analysed. It is found that the stiffness of the group is much …

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Response Of Pile Under Dynamic Loading, Somnath Bandyopadhyay Mar 1991

Response Of Pile Under Dynamic Loading, Somnath Bandyopadhyay

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

The need for a better understanding of soil pile interaction problem under dynamic loading especially in a nonlinear soil medium has always been felt by engineers. This paper presents a PC based Finite Element I Finite Difference analysis of a Three Dimensional soil pile interaction problem in Elasto Plastic soil under transient and periodic dynamic loading. Assuming separation of variable is permitted method of Finite Element has been used over space and then the solution proceeds over time by explicit integration. Numerical experimentation with a 3 x 3 x 3 model offers a stable response which (qualitatively) with Green's function …

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Seismic Behaviour Of Bridges Considering Soil-Structure Interaction, S. K. Thakkar, D. K. Mazumdar, P. R. Bose Mar 1991

Seismic Behaviour Of Bridges Considering Soil-Structure Interaction, S. K. Thakkar, D. K. Mazumdar, P. R. Bose

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

The soil-structure interaction has significant effect on seismic response of bridges in many situations. The choice of soil springs for response determination is an important consideration. This paper presents a comparative assessment of the seismic response of bridge substructure by four different types of frequency independent soil springs namely, Beredugo-Novak, Wolf, Bycroft-Parmelee and Terzaghi. The variation of equivalent weighted damping and equivalent seismic coefficient is also studied. The Terzaghi's soil springs obtained by modulus of subgrade reaction approach are most flexible as compared to others. The responses are seen to be comparable with springs other than Terzaghi. The equivalent damping …

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Seismic Response Analysis Of A Thick Overburden Consisting Of Loose And Soft Soil, Wenyao Hu, Zhengyuan Xia Mar 1991

Seismic Response Analysis Of A Thick Overburden Consisting Of Loose And Soft Soil, Wenyao Hu, Zhengyuan Xia

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

It is known that not only local soil conditions but also seismic wave, used in analysis, together with its input conditions had a major effect on the intensity and characteristics of ground motion. In this paper the ground motions to different input depths of base motion under the near epicenter or far epicenter conditions, using EL CENTRO record after adjusting as base motion input, for two representative sites in Shanghai were reviewed and the results of analytical studies were presented to explore the site dependent design spectra suited to local conditions.

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Seismic Response Analysis Of Pile-Supported Structure: Assessment Of Commonly Used Approximations, Toyoaki Nogami, Reed L. Mosher, H. Wayne Jones Mar 1991

Seismic Response Analysis Of Pile-Supported Structure: Assessment Of Commonly Used Approximations, Toyoaki Nogami, Reed L. Mosher, H. Wayne Jones

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

The seismic response of a pile-supported structure is formulated by the approach developed by the first author. Using this formulation, some of the crude approximations frequently used in the seismic response analysis of a soil-pile-structure system are examined. Those involved in the analysis procedure are assessed under the linear elastic condition. A commonly used nonlinear soil model for the dynamic pile response analysis is also assessed. It is found that those approximations routinely used in the analysis procedure and numerical modelling can cause significant errors in the computed response of a pile-supported structure.

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Seismic Response Of Floating Piles To Obliquely Incident Waves, Shahid Ahmad, S. M. Mamoon Mar 1991

Seismic Response Of Floating Piles To Obliquely Incident Waves, Shahid Ahmad, S. M. Mamoon

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

The response of single piles under vertically and obliquely incident SH, SV, and P waves is obtained using a hybrid boundary element (BEM) formulation. The piles are represented by compressible beam-column elements and the soil as a hysteretic viscoelastic half-space. A recently developed Green function corresponding to the dynamic Mindlin problem is implemented in the numerical formulation. Exact analytical solutions for the differential equations for the piles under distributed harmonic excitations are used. Treating the half-space as a three-dimensional elastic continuum, the interaction problem is formulated by satisfying equilibrium and displacement compatibility along the pile-soil interface. Solutions adopted for the …

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Soil-Pile-Structure Interaction During Liquefaction, Shoei Nomura, Yasuhiro Shamoto, Kohji Tokimatsu Mar 1991

Soil-Pile-Structure Interaction During Liquefaction, Shoei Nomura, Yasuhiro Shamoto, Kohji Tokimatsu

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

An analytical method is presented for evaluating dynamic response of soil-pile-structure system during soil liquefaction. The method consists of a modified Penzien's model combined with an effective stress analysis for free-field soil response and a horizontal subgrade reaction model which connects free field response with pile-structure response. Shaking table tests are conducted to study the effectiveness of the proposed procedure. A model sand deposit-pile-structure system is constructed in a large container which can permit shear deformation of the soil. Soil density, pile diameter, pile rigidity, and input motion are controlling variables in the tests. Analysis is made for both liquefied …

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Soil-Structure Interaction At The Waterfront, J. M. Ferritto Mar 1991

Soil-Structure Interaction At The Waterfront, J. M. Ferritto

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

The Navy, forced by its mission to locate at the waterfront, often on loose, saturated cohesionless soils, faces a severe liquefaction threat. Research has been in progress to evaluate the Princeton University Effective Stress Soil Model. This paper discusses that model and presents a validation example study comparing model predictions with a centrifuge experiment.

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Soil-Structure Interaction Effects Based On Recorded Strong Motions During Earthquakes, Kosta Talaganov, Misko Cubrinovski Mar 1991

Soil-Structure Interaction Effects Based On Recorded Strong Motions During Earthquakes, Kosta Talaganov, Misko Cubrinovski

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

Presented in this paper are the results of the analyses of dynamic soil-structure interaction effects based on recorded strong motions during Montenegro (Yugoslavia) earthquake of April 15, 1979. Acceleration time histories have been recorded by strong motion instruments installed at foundation level of structures located in the epicentral area, founded in different soil conditions including stiff, medium and soft soils. Applying substructure technique from known motions at foundation level of structures, corresponding free field motions were computed. By comparison of computed free field motions and recorded motions at foundation level, dynamic soil-structure interaction effects, in different soil conditions and levels …

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