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Showing papers on "Soil structure interaction published in 1996"


Journal ArticleDOI
TL;DR: In this article, a closed-form solution for the wave-induced pore pressure, soil displacements and effective stresses in an elastic sea-bed subject to a system of two intersecting waves was developed.
Abstract: Consolidation and storage equations are used to develop a closed-form solution for the wave-induced pore pressure, soil displacements and effective stresses in an elastic sea-bed subject to a system of two intersecting waves. A homogeneous soil matrix of finite thickness in isotropic and saturated conditions only is considered. The three-dimensional general solutions so developed are readily reducible to the conditions for soil of infinite thickness, and also for the limiting cases of two-dimensional progressive and standing waves for soil of finite thickness, for which no explicit solutions have previously been available. Verification of this solution with results of two-dimensional solutions available from a semi-analytical method, a boundary-layer approximation and a numerical model is carried out. Validation is performed by comparison with experimental results. The effects on wave-induced pore pressure of sea-bed thick- ness, shear modulus of soil and grain size are discussed. Les equations de stockag...

104 citations


Journal ArticleDOI
TL;DR: In this article, a comprehensive assessment of damping values and other dynamic characteristics of five buildings using strong-motion and low-amplitude (ambient vibration) data is presented.

58 citations


Journal ArticleDOI
TL;DR: In this article, a simple rational procedure to analyse the response of a structure supported on pile groups is presented, and the problem of soil-pile-foundation-superstructure interaction is examined.
Abstract: The problem of soil—pile—foundation—superstructure interaction is examined, and a simple rational procedure to analyse the response of a structure supported on pile groups is presented. This proced...

38 citations


Journal ArticleDOI
TL;DR: In this article, an exact theoretical formulation for the analysis of a thin-walled pile embedded in an elastic half-space under vertically-incident P-wave excitation is presented.

32 citations


Journal ArticleDOI
TL;DR: In this paper, a non-linear seismic response analysis method for 2D saturated soil-structure system with an absorbing boundary is presented, based on Biot's two-phase mixture theory, and a simulation of the shaking table test is performed by applying the proposed constitutive model.
Abstract: A non-linear seismic response analysis method for 2-D saturated soil-structure system with an absorbing boundary is presented. According to the 3-D strain space multimechanism model for the cyclic mobility of sandy soil, a constitutive expression for the plane strain condition is first given. Next, based on Biot's two-phase mixture theory, the finite element equations of motion for a saturated soil structure system with an absorbing boundary during earthquake loadings are derived. A simulation of the shaking table test is performed by applying the proposed constitutive model. The effectiveness of the absorbing boundary is examined for the 2-D non-linear finite element models subjected to random inputs. Finally, a numerical seismic response analysis for a typical saturated soil-structure system is performed as an application of the proposed method.

22 citations


Journal ArticleDOI
TL;DR: In this paper, the kinematic nonlinear interaction of coupled RC/soil system under static and dynamic loads is analyzed for two types of underground structures subjected to high shear deformation transferred through the nonlinear surrounding soil.
Abstract: This paper presents various aspects of the kinematic nonlinear interaction of coupled RC/soil system under static and dynamic loads. Conducted are parametric studies for two types of underground structures subjected to high shear deformation transferred through the nonlinear surrounding soil. In this analysis influences of several factors, such as material nonlinearity of RC and soil, stiffness of structure and reinforcement ratio, are investigated. Failure modes, residual deformations and induced force to the RC from soil are examined for rationalized guidelines serving future improvement of the underground structural design.

16 citations


Journal ArticleDOI
TL;DR: In this article, the authors used a limited amount of data on soil properties and limited instrumentation readings to estimate lock performance from initial construction through major flood events, including siltation.
Abstract: Using the backfill placement method of analysis, the authors were able to use a limited amount of data on soil properties and limited instrumentation readings to estimate lock performance from initial construction through major flood events, including siltation. Results of the complete soil-structure-foundation interaction analyses for four operational load cases were critical in interpreting instrumentation measurements. A distinction was made between soil-structure interaction of the compacted sand backfill and the stem walls and the interaction of the compacted sand backfill and the culvert walls. This investigation considered the characterization of the range in magnitudes and distributions of horizontal earth pressure coefficient, Kh, and vertical earth pressure coefficient, Kv, along the stem and culvert walls for each load case. Expressing the effective normal pressure and vertical shear stress along lock walls, in relation to earth pressure coefficients, allowed for the precise recovery of both normal and shear stresses for use in simplified design tools.

15 citations


Journal ArticleDOI
TL;DR: In this paper, a 10-m concrete arch was examined under combined static and seismic loading (both horizontal, and vertical) and the results indicated that significant increases in thrust and moment in the arch were observed.
Abstract: Field experience indicates that large buried culverts have suffered essentially no damage during past earthquakes when no significant permanent ground movements have occurred. These soil structures, which generally comprise steel or concrete arch members and engineered soil, may have spans of 15 m. Static, pseudodynamic, and dynamic finite-element analyses have been carried out on these structures and indicate that for horizontal seismic loading, the surrounding soil is much stiffer than the arch and results in the seismic load being taken by the soil rather than by the arch. Under vertical seismic loading, the arch is stiffer than the surrounding soil and attracts significant load, which can essentially be accounted for by increasing the unit weight of the soil in proportion to the vertical acceleration. Thrusts and moments in a 10-m concrete arch are examined under combined static and seismic loading (both horizontal, and vertical). The results indicate that significant increases in thrust and moment in...

15 citations


Journal ArticleDOI
TL;DR: In this paper, the authors presented reversed cyclic models of coupled RC/soil system, which were installed in the FEM program WCOMR-SJ and analyzed the nonlinear interaction of RC and soil system and induced damage of underground RC.
Abstract: This paper presents reversed cyclic models of coupled RC/soil system. The full path-dependent constitutive models of RC, soil and their interfacial zones which are installed in the FEM program WCOMR-SJ are explained. Consequently, RC/soil hysteresis damping and energy absorption are coherently taken into account with corresponding states of damage and plasticity regarding concrete and reinforcement. This computational tool was systematically verified through coupled RC/soil system subjected to static reversed cyclic loads. The nonlinear interaction of RC/soil system and induced damage of underground RC are investigated.

14 citations


Journal ArticleDOI
TL;DR: This poster presents a probabilistic reconstruction of the response of the immune system to the presence of carbon dioxide and shows clear patterns in the immune response to carbon dioxide.
Abstract: Note: [208] Reference LCH-ARTICLE-1996-006View record in Web of Science Record created on 2007-04-24, modified on 2016-08-08

12 citations


Journal ArticleDOI
TL;DR: In this paper, a simple mechanical model is presented for the three-dimensional dynamic soil-structure interaction analysis of surface foundations, which is made of one-dimensional vertical beams with distributed mass and horizontal springs.

Journal ArticleDOI
TL;DR: In this paper, a series of steel posts and timber posts were instrumented with soil pressure transducers to assess the soil-post load response to a 1,388-kg bogie striking the post at 33 km/hr.
Abstract: A series of steel posts (W150 X 12.6) and timber posts (15.2 X 20.3 cm) were instrumented with soil pressure transducers to assess the soil-post load response to a 1,388-kg bogie striking the post at 33 km/hr. Soil pressure measurements demonstrated the dramatic effects of soil shear strength and modulus on the responses of both timber and wood posts. The differences in the failure mechanisms between stiff and soft cohesive soils and noncohesive soils are demonstrated by both stress distributions and total stresses measured by the pressure transducers. The measurement system has potential applications for measurement of loads during impact testing of guardrail systems and as a tool for developing more appropriate models of soil behavior during impact loading.

Journal ArticleDOI
TL;DR: In this paper, Fourier transforms are used to reduce the three-dimensional problem to one involving only two spatial directions, thereby reducing the data preparation and computation time, and conventional finite element analysis is used to approximate the field quantities in the transformed two-dimensional plane.
Abstract: A method is presented which may be used to compute the displacements, strains and moments (both in-plane and transverse) in buried structures such as pipelines and culverts subjected to longitudinal bending. This type of bending can occur if a surface loading such as a vehicular loading or an embankment loading is applied to the soil above the pipe or culvert. Fourier transforms are used to reduce the three-dimensional problem to one involving only two spatial directions, thereby reducing the data preparation and computation time. Conventional finite element analysis is used to approximate the field quantities in the transformed two-dimensional plane. Two Fourier integral element types have been developed which have many applications in geotechnical engineering.


Journal ArticleDOI
TL;DR: In this paper, a simplified procedure for the linear and nonlinear two-dimensional analysis of the soil-footing-structure system is described, where the interaction effects generated by the normal and tangential resistance of soil against all active sides of the stiff footing are taken into account.

Journal ArticleDOI
TL;DR: In this paper, a two-dimensional elastic Chebyshev spectral element (SPEM) was used to model the seismic wavefield within a massive structure and in its vicinity, where the scattering of Rayleigh waves and the response of the structure were extensively analyzed in a parametric way, varying size, mechanical parameters and shape of the load.

Proceedings Article
01 Jan 1996
TL;DR: In this article, three-dimensional Boundary Element models in the frecuency domain have been proposed and dimensionless dynamic stiffness of standard bridge abutments has been obtained for short-span bridges.
Abstract: Strong motion obtained in instrumental short-span bridges show the importance of the abutments in the dynamic response of the whole structure. Many models ha ve heen used in order to take into account the influence of pier foundations although no reliable ones have been used to analyse the abutment performance. In this work three-dimensional Boundary Element models in frecuency domain have been proposed and dimensionless dynamic stiffness of standard bridge ahutmcnts have been obtained.




01 Jan 1996
TL;DR: In this paper, a nonlinear dynamic soil structure interaction model using kinematic hardening, nonlinear SSI-springs is presented, and conditions which must be fulfilled for such model to be valid.
Abstract: A nonlinear dynamic soil structure interaction model may be obtained using kinematic hardening, nonlinear SSI-springs. This paper discusses conditions which must be fulfilled for such model to be valid, and outlines how the nonlinear springs may be developed. A method is proposed to evaluate their inherent hysteretic damping before they are applied in any dynamic response analysis.





Journal ArticleDOI
TL;DR: In this paper, it will be demonstrated that the condensation technique well known in structural mechanics can in reality be employed to formulate the soil-structure interaction problems in a rather straightforward manner.

16 Sep 1996
TL;DR: In this article, an attempt was made on estimating the deformations in soil-structure interaction problems using a finite element code called SWANDYNE, Chan (1988), and the formulation of the fully coupled code and the improvements brought in the predictions by knowledge of the experimental conditions were presented.
Abstract: Use of geotechnical centrifuges has established as a powerful technique in the understanding of soil-structure interaction problems subjected to earthquake loading. In the VELACS conference, Arulanandan and Scott (1993), several numerical predictors have attempted to predict the dynamic behaviour of several bench mark problems which were simulated in the centrifuge tests in more than one geotechnical centrifuges. The results of the centrifuge tests conducted at different centrifuge centres were reasonable and provided a large data base against which numerical predictions may be compared. The Class A numerical predictions carried out without prior knowledge of the centrifuge test data were less satisfactory. Of all the predictions the finite element codes which employed fully coupled formulations for the solid and fluid phase performed well. There were some differences in the prediction of excess pore pressure for some of the bench-mark problems. Also attenuation in the local acceleration where there is rise in excess pore pressure was predicted by only some codes. A class C prediction carried out with prior knowledge of experimental data, on the quay wall with saturated back-fill (model no.ll), Madabhushi and Zeng (1993), could simulate the experimental data accurately in terms of accelerations, excess pore pressures as well as the deformations. One of the important prediction that is sought by the practising geotechnical earthquake engineers would be the deformation that will be suffered by the particular civil engineering structure under consideration. In this paper an attempt will be made on estimating the deformations in soil-structure interaction problems using a finite element code called SWANDYNE, Chan (1988). The formulation of the fully coupled code and the improvements brought in the predictions by knowledge of the experimental conditions, Madabhushi and Zeng (1993), Chan et al (1994), Madabhushi (1994), will be presented. The improvements to the prediction of the quay wall problem with saturated and dry back fill following the work of Madabhushi and Zeng (1993), will be presented Madabhushi and Zeng (1996). Also the deformations predicted in the problem of a tower structure founded on saturated sand bed, Madabhushi (1994) will be presented. Also more recent work on the liquefaction under saturated embankments, Madabhushi et al (1996) and its implications in the finite element modelling of this problem will be discussed.