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Articles 11521 - 11550 of 13029
Full-Text Articles in Engineering
Seismic Behaviour Of Bridges Considering Soil-Structure Interaction, S. K. Thakkar, D. K. Mazumdar, P. R. Bose
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 …
Seismic Response Analysis Of A Thick Overburden Consisting Of Loose And Soft Soil, Wenyao Hu, Zhengyuan Xia
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.
Seismic Response Analysis Of Pile-Supported Structure: Assessment Of Commonly Used Approximations, Toyoaki Nogami, Reed L. Mosher, H. Wayne Jones
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.
Seismic Response Of Floating Piles To Obliquely Incident Waves, Shahid Ahmad, S. M. Mamoon
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 …
Soil-Pile-Structure Interaction During Liquefaction, Shoei Nomura, Yasuhiro Shamoto, Kohji Tokimatsu
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 …
Soil-Structure Interaction At The Waterfront, J. M. Ferritto
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.
Soil-Structure Interaction Effects Based On Recorded Strong Motions During Earthquakes, Kosta Talaganov, Misko Cubrinovski
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 …
Soil-Structure Interaction Effects On The Response Of Meloland Bridge, E. A. Maragakis, S. Vrontinos, B. M. Douglas, S. Abdel-Ghaffar
Soil-Structure Interaction Effects On The Response Of Meloland Bridge, E. A. Maragakis, S. Vrontinos, B. M. Douglas, S. Abdel-Ghaffar
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A study related to the experimental data obtained from the full-scale tests of Meloland Road overcrossing is presented. The major objective of this study is to demonstrate that the soil structure interaction effects play a significant role in the dynamic response of the structure. Initially, the results from the static deformation of the bridge under the quick-release loads are presented. These results were obtained by applying a special integration technique on the experimental acceleration records. Then a preliminary analytical model of the bridge is fitted to the experimental data in order to evaluate the values of the soil-structure springs along …
Stochastic Response Of Lifeline To Spatial Variation Of Seismic Waves, Chin-Hsiung Loh
Stochastic Response Of Lifeline To Spatial Variation Of Seismic Waves, Chin-Hsiung Loh
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The spatial variation of seismic waves has an important effect on the seismic response of structures of extended length. Based on data collected from the SMART-1 array, the spatial variation of seismic waves can be examined. The purpose of this paper is to examine the effect of the spatial variation of seismic waves on a spatially distributed system. With the consideration of the soil amplification ratio between two sites and spatial variation of seismic waves, a ground deformation spectrum is developed from stochastic point of view. This spectrum can provide information useful in predicting maximum ground deformation. The seismic response …
Study On Dynamic Characteristics Of A Pile Group Foundation, Takuji Kobori, Kenji Miura, Masaaki Nakazawa, Katsuichiro Hijikata, Yuji Miyamoto, Takafumi Moroi, Yoshinao Kobayashi
Study On Dynamic Characteristics Of A Pile Group Foundation, Takuji Kobori, Kenji Miura, Masaaki Nakazawa, Katsuichiro Hijikata, Yuji Miyamoto, Takafumi Moroi, Yoshinao Kobayashi
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
The earthquake response of a structure on group of piles is investigated. The test model, which is employed in this study, is a foundation on four piles. Three conditions are prepared for examination of the contact effects of the foundation bottom and the backfilling effects on dynamic characteristics of the foundation on the piles. Forced vibration tests are carried out for ascertaining the impedance functions as the inertial interaction, and earthquake observations for the earthquake input motion as the kinematic interaction. On the basis of the test and the observation results, the correlation analyses are executed for examining the applicability …
The Learning From The Large Scale Lotung Soil-Structure Interaction Experiments, A. H. Hadjian, D. Anderson, W. S. Tseng, N. C. Tsai, C. Y. Chang, Y. K. Tang, H. T. Tang, J. C. Stepp
The Learning From The Large Scale Lotung Soil-Structure Interaction Experiments, A. H. Hadjian, D. Anderson, W. S. Tseng, N. C. Tsai, C. Y. Chang, Y. K. Tang, H. T. Tang, J. C. Stepp
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Blind prediction analyses and subsequent correlation studies of a 1/4-scale reinforced concrete containment model constructed at Lotung, Taiwan subject to forced vibration tests and actual earthquakes are evaluated with the objective of validating soil-structure interaction (SSI) analysis methodologies commonly used in U.S. practice. The SSI methods used range from simple soil-spring representation to more complex finite-element methods and sub structuring techniques. Both forced vibration test (FVT) data and actual earthquake induced response data have been obtained for use in validating selected SSI analysis methodologies. Considering that for forced vibration tests only the stiffness and damping characteristics of the foundation are …
A Model For Predicting Liquefaction Induced Displacement, Peter M. Byrne
A Model For Predicting Liquefaction Induced Displacement, Peter M. Byrne
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A simple model for predicting liquefaction induced displacement is presented. The method is based on a single-degree-of-freedom system that incorporates the post-liquefaction stress-strain response of sand. The key parameters are the residual strength and the limiting shear strain, and considerable data presently exists on these two parameters from correlation with SPT (N1)60 values. Based on this data, liquefaction induced displacements from the model are compared with both field and laboratory measurements. The model predictions are found to be in excellent agreement with the measurements and indicate that liquefaction induced displacements are very sensitive to the density or …
A New Approach For Evaluating Stability And Deformation Of Earthstructure In Earthquake, Kuniaki Karaki, Akira Hirotani, Sadao Goto, Nobuyuki Yoshida
A New Approach For Evaluating Stability And Deformation Of Earthstructure In Earthquake, Kuniaki Karaki, Akira Hirotani, Sadao Goto, Nobuyuki Yoshida
International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
A new procedure for determining the shear strength of sand for slope stability analysis. An earthquake is proposed together with a simplified procedure for predicting deformation in earthquake. The proposed method is based on the advanced total stress method and uses undrained strength of sand with consideration on strength anisotropy. Soil parameters required in the use of proposed method as well as for deformation prediction are indicated and then results of stability and deformation analyses with the proposed method are presented for a revetment constructed on a silty sand on Tokyo Bay together with 1) field and laboratory tests results, …
Appendix: List Of Participants [1990], Kentucky Transportation Center
Appendix: List Of Participants [1990], Kentucky Transportation Center
Kentucky's Annual Forum on Transportation
No abstract provided.
Wrap-Up Luncheon [1990], Milo D. Bryant
Wrap-Up Luncheon [1990], Milo D. Bryant
Kentucky's Annual Forum on Transportation
No abstract provided.
Recruitment And Retention Of Transportation Professionals And Civil Engineers, O. Gilbert Newman
Recruitment And Retention Of Transportation Professionals And Civil Engineers, O. Gilbert Newman
Kentucky's Annual Forum on Transportation
No abstract provided.
Kentucky Aviation And Economic Development, Michael Flack
Kentucky Aviation And Economic Development, Michael Flack
Kentucky's Annual Forum on Transportation
No abstract provided.
Passenger Transit, Brenda Rice
Passenger Transit, Brenda Rice
Kentucky's Annual Forum on Transportation
No abstract provided.
Waterways Transportation, Dick Cirre
Waterways Transportation, Dick Cirre
Kentucky's Annual Forum on Transportation
No abstract provided.
Kentucky's Transportation Needs For Economic Development, David E. Smith
Kentucky's Transportation Needs For Economic Development, David E. Smith
Kentucky's Annual Forum on Transportation
No abstract provided.
General Session [1990], Eugene R. Mccormick
General Session [1990], Eugene R. Mccormick
Kentucky's Annual Forum on Transportation
No abstract provided.
Automated Pavement Distress Surveys, John Hunt
Automated Pavement Distress Surveys, John Hunt
Kentucky's Annual Forum on Transportation
No abstract provided.
Fast Track Concrete Paving, John Mcchord
Fast Track Concrete Paving, John Mcchord
Kentucky's Annual Forum on Transportation
No abstract provided.
Advantage I-75 Project, Jerry Lentz
Advantage I-75 Project, Jerry Lentz
Kentucky's Annual Forum on Transportation
No abstract provided.
Asphalt Materials, T. Scott Shuler
Asphalt Materials, T. Scott Shuler
Kentucky's Annual Forum on Transportation
No abstract provided.
Kentucky's Future Economic Growth Policy: A Legislative Perspective, John A. "Eck" Rose
Kentucky's Future Economic Growth Policy: A Legislative Perspective, John A. "Eck" Rose
Kentucky's Annual Forum on Transportation
No abstract provided.
Spurring Economic Development In Kentucky's Communities, Robert N. Elliston
Spurring Economic Development In Kentucky's Communities, Robert N. Elliston
Kentucky's Annual Forum on Transportation
No abstract provided.
Kentucky's Investment In Economic Growth, D. Jeffrey Noel
Kentucky's Investment In Economic Growth, D. Jeffrey Noel
Kentucky's Annual Forum on Transportation
No abstract provided.
Investments In Economic Growth: A National Perspective, Merl M. Hackbart
Investments In Economic Growth: A National Perspective, Merl M. Hackbart
Kentucky's Annual Forum on Transportation
No abstract provided.
Does Transportation Lead Economic Growth?, James M. Wiseman
Does Transportation Lead Economic Growth?, James M. Wiseman
Kentucky's Annual Forum on Transportation
No abstract provided.