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Seismic Analysis Of Cantilever Retaining Wall Including Soil Structure Interaction
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Book Synopsis Seismic Analysis of Cantilever Retaining Wall, Including Soil-Structure Interaction by : T.D. Doshi
Download or read book Seismic Analysis of Cantilever Retaining Wall, Including Soil-Structure Interaction written by T.D. Doshi and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Cantilever retaining walls are required to retain earth at a change in ground elevation. Cantilever retaining walls are made of reinforced concrete and consist of a thin stem and a base slab. During a seismic event, it is evident that earthquake response of each component of this complex system (i.e., wall, soil and structure) may affect substantially the response of the rest and vice versa. This earthquake response which is described as soil-structure interaction is generally ignored in the design process of cantilever retaining walls, though it has been shown that ignoring such effect may lead to unsafe seismic design. Flexibility of soil medium below foundation decreases the overall stiffness of the cantilever retaining wall structure, resulting in a subsequent increase in the displacement and reaction of the retaining wall structure. Hence in the present study, an attempt is made to observe the effects of soil-structure interaction on the change displacement and reaction of cantilever retaining wall considering different types of retaining wall system and variations of factors such as different earthquake zones (viz., 2, 3, 4, 5) and different support conditions (viz., fixed, fixed but, and foundation). The analysis of a retaining wall model has been modeled and analyzed using STAAD PRO software. The study shows that displacement and reaction increases with increase in the earthquake zones for different types of retaining walls with different support conditions. Therefore, the present study helps in understanding the effect of soil-structure interaction on cantilever retaining walls, which might help to improve the seismic behavior of cantilever retaining wall and also lead to a more economic design.
Book Synopsis Seismic Analysis and Design of Retaining Walls, Buried Structures, Slopes, and Embankments by : Donald G. Anderson
Download or read book Seismic Analysis and Design of Retaining Walls, Buried Structures, Slopes, and Embankments written by Donald G. Anderson and published by Transportation Research Board. This book was released on 2008 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report explores analytical and design methods for the seismic design of retaining walls, buried structures, slopes, and embankments. The Final Report is organized into two volumes. NCHRP Report 611 is Volume 1 of this study. Volume 2, which is only available online, presents the proposed specifications, commentaries, and example problems for the retaining walls, slopes and embankments, and buried structures.
Book Synopsis Seismic soil structure interaction of navigation locks by : Maltidis, Georgios
Download or read book Seismic soil structure interaction of navigation locks written by Maltidis, Georgios and published by KIT Scientific Publishing. This book was released on 2017-12-20 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work handles the seismic soil- and water structure interaction of navigation locks in the field of elastodynamics. The investigation is based on numerical analysis with the finite element method. The findings extend the results of available theories and studies and allow for a more precise analysis and design of such structures. Suggestions about the numerical analysis of such problems are also presented. The results can be used also for quay and retaining walls.
Book Synopsis Soil-structure interaction in seismic analysis by : Alexander Tyapin
Download or read book Soil-structure interaction in seismic analysis written by Alexander Tyapin and published by ASV Construction. This book was released on 2019-06-11 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil-structure interaction (SSI) is an important phenomenon in the seismic response analysis. As seismologists describe seismic excitation in terms of the seismic motion of certain control point at the free surface of the initial site, the question is whether the same point of the structure (after structure appears) will have the same seismic response motion in case of the same seismic event. If yes, then seismic motion from seismologists is directly applied to the base of the structure (it is called “fixed-base analysis”), and they say that “no SSI occurs”’ (though literally speaking soil is forcing structure to move, so interaction is always present). This is a conventional approach in the field of civil engineering. However, if heavy and rigid structure (sometimes embedded) is erected on medium or soft soil site, this structure changes the seismic response motion of the soil as compared to the initial free-field picture. Such a situation is typical for Nuclear Power Plants (NPPs), deeply embedded structures, etc. The book describes different approaches to SSI analysis and different SSI effects. Special attention is paid to the Combined Asymptotic Method (CAM) developed by the author and used for the design of NPPs in seismic regions. Nowadays, some civil structures have parameters comparable to those of NPPs (e.g., masses and embedment), so these approaches become useful for the civil structural engineers as well.
Book Synopsis Structural Dynamics and Soil-structure Interaction by : A. S. Cakmak
Download or read book Structural Dynamics and Soil-structure Interaction written by A. S. Cakmak and published by . This book was released on 1989 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis and Design of Retaining Structures Against Earthquakes by : Shamsher Prakash
Download or read book Analysis and Design of Retaining Structures Against Earthquakes written by Shamsher Prakash and published by . This book was released on 1996 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: GSP 60 contains eight papers on retaining structures to withstand earthquakes presented at sessions of the ASCE National Convention, held in Washington, D.C., November 10-14, 1996.
Book Synopsis Seismic Analysis of Cantilever Retaining Walls, Phase I by : Russell A. Green
Download or read book Seismic Analysis of Cantilever Retaining Walls, Phase I written by Russell A. Green and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental and Numerical Modeling of Seismic Earth Pressures on Retaining Walls with Cohesive Backfills by : GABRIEL ALFONSO. CANDIA
Download or read book Experimental and Numerical Modeling of Seismic Earth Pressures on Retaining Walls with Cohesive Backfills written by GABRIEL ALFONSO. CANDIA and published by . This book was released on 2013 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Observations from recent earthquakes show that all types of retaining structures with non-liquefiable backfills perform very well and there is limited evidence of damage or failures related to seismic earth pressures. Even retaining structures designed only for static loading have performed well during strong ground motions suggesting that special seismic design provisions may not be required in some cases. The objective of this study was to characterize the seismic interaction of backfill-wall systems using experimental and numerical models, with emphasis on cohesive soils, and to review the basic assumptions of current design methods. In the experimental phase of this research, two sets of centrifuge models were conducted at the Center for Geotechnical modeling in UC Davis. The first experiment consisted of a basement wall and a freestanding cantilever wall with level backfill, while the second one consists of a cantilever wall with sloping backfill. The soil used in the experiments was a compacted low plasticity clay. Numerical simulations were performed using FLAC2-D code, featuring non-linear constitutive relationships for the soil and interface elements. The non-linear hysteretic constitutive UBCHYST was used to model the level ground experiment and Mohr-Coulomb with hysteretic damping was used to model the sloping backfill experiment. The simulations captured the most important aspects of the seismic responses, including the ground motion propagation and the dynamic soil-structure interaction. Special attention was given to the treatment of boundary conditions and the selection of the model parameters. The results from the experimental and numerical analysis provide information to guide the designers in selecting seismic design loads on retaining structures with cohesive backfills. The experimental results show that the static and seismic earth pressures increase linearly with depth and that the resultant acts at 0.35H-0.4H, as opposed to 0.5-0.6H assumed in current engineering practice. In addition, the observed seismic loads are a function of the ground motion intensity, the wall type and backfill geometry. In general, the total seismic load can be expressed using Seed and Whitman's (1970) notation as: Pae=Pa+dPae, where Pa is the static load and dPae is the dynamic load increment. While the static load is a function of the backfill strength, previous stress history and compaction method, the dynamic load increment is a function of the free field PGA, the wall displacements, and is relatively independent of cohesion. In level ground, the dynamic load coefficient can be expressed as dKae=1/2gH2(0.68PGAff/g) for basement walls and dKae=1/2gH2(0.42PGAff/g) for cantilever walls; these results are consistent with similar experiments performed in cohesionless soils (Mikola & Sitar, 2013. In the sloping ground experiment the seismic coefficient came out to dKae=1/2gH2(0.7PGAff/g), which is consistent with Okabe's (1926) Coulomb wedge analysis of the problem. However, that slope was stable under gravity loads even without the presence of the retaining wall (FS=1.4). Measured slope displacements were very small and in reasonable good agreement with the predictions made with the Bray and Travasarou (2007) semi-empirical method. The experimental data was not sufficient to determine accurately the point of action of the seismic loads. However, the numerical simulations and Okabe's (1926) limit state theory suggest that the resultant acts between 0.37H-0.40H for typical values of cohesion. While the resultant acts at a point higher than 0.33H with increasing cohesion, the total seismic moment is reduced due to the significant reduction in the total load Pae, particularly for large ground accelerations. The results also show that typical retaining walls designed with a static factor of safety of 1.5 have enough strength capacity to resist ground accelerations up to 0.4g. This observation is consistent with the field performance of retaining walls as documented by Clough and Fragaszy (1977) and the experimental results by al Atik and Sitar (2010) and Geraili and Sitar (2013). The evaluation of earth pressures at the wall-backfill interface continues to be a technical challenge. Identified sources of error in the present study include the behavior of pressure sensors, the geometric and mass asymmetry of the model and the dynamic interaction between the model and the container. While these centrifuge experiments reproduced the basic response of prototype models, ultimately, instrumented full-scale structures are most essential to fully characterize the response of tall walls and deep basements with varieties of backfill.
Book Synopsis Coupled Site and Soil-Structure Interaction Effects with Application to Seismic Risk Mitigation by : Tom Schanz
Download or read book Coupled Site and Soil-Structure Interaction Effects with Application to Seismic Risk Mitigation written by Tom Schanz and published by Springer Science & Business Media. This book was released on 2009-06-18 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Research Workshop on Coupled Site and Soil-Structure Interaction Effects with Application to Seismic Risk Mitigation Borovets, Bulgaria 30 August - 3 September 2008
Book Synopsis Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions by : Francesco Silvestri
Download or read book Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions written by Francesco Silvestri and published by CRC Press. This book was released on 2019-07-19 with total page 8083 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions contains invited, keynote and theme lectures and regular papers presented at the 7th International Conference on Earthquake Geotechnical Engineering (Rome, Italy, 17-20 June 2019. The contributions deal with recent developments and advancements as well as case histories, field monitoring, experimental characterization, physical and analytical modelling, and applications related to the variety of environmental phenomena induced by earthquakes in soils and their effects on engineered systems interacting with them. The book is divided in the sections below: Invited papers Keynote papers Theme lectures Special Session on Large Scale Testing Special Session on Liquefact Projects Special Session on Lessons learned from recent earthquakes Special Session on the Central Italy earthquake Regular papers Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions provides a significant up-to-date collection of recent experiences and developments, and aims at engineers, geologists and seismologists, consultants, public and private contractors, local national and international authorities, and to all those involved in research and practice related to Earthquake Geotechnical Engineering.
Book Synopsis Seismic Analysis of Three-dimensional Soil-structure Interaction System with a Rectangular Base by : Serif Saylan
Download or read book Seismic Analysis of Three-dimensional Soil-structure Interaction System with a Rectangular Base written by Serif Saylan and published by . This book was released on 1982 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Soil-structure Interaction and Its Roles in Performance-based Seismic Analysis of Shear Wall Structures by : Yuchuan Tang
Download or read book Soil-structure Interaction and Its Roles in Performance-based Seismic Analysis of Shear Wall Structures written by Yuchuan Tang and published by . This book was released on 2009 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seismic Analysis and Design for Soil-pile-structure Interactions by : Shamsher Prakash
Download or read book Seismic Analysis and Design for Soil-pile-structure Interactions written by Shamsher Prakash and published by American Society of Civil Engineers. This book was released on 1997 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pile foundations are used extensively to support buildings and other structures. Since earthquakes may cause dynamic loads on these structures, the response of pile foundations to these dynamic loads is extremely complex. The papers in this proceedings address the analysis and design of pile foundations under dynamic loads and focus on unsolved issues.
Book Synopsis Numerical Analysis on Seismic Response of Cantilever Retaining Wall Systems and Fragility Analysis on Motion Response by : Siavash Zamiran
Download or read book Numerical Analysis on Seismic Response of Cantilever Retaining Wall Systems and Fragility Analysis on Motion Response written by Siavash Zamiran and published by . This book was released on 2017 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this investigation, seismic response of retaining walls constructed with cohesive and cohesionless backfill materials was studied. Fully dynamic analysis based on finite difference method was used to evaluate the performance of retaining walls during the earthquake. The analysis response was verified by the experimental study conducted on a retaining wall system with cohesive backfill material in the literature. The effects of cohesion and free-field peak ground acceleration (PGA) on seismic earth thrust, the point of action of earth thrust, and maximum wall moment during the earthquake were compared with analytical and experimental solutions. The numerical results were compared with various analytical solutions. The motion characteristics of the retaining wall during the earthquake were also considered. The relative displacement of the walls with various backfill cohesions, under different ground motions, and free-field PGAs were investigated. Current analytical and empirical correlations developed based on Newmark sliding block method for estimating retaining wall movement during earthquakes were compared with the numerical approach. Consequently, fragility analyses were conducted to determine the probability of damage to the retaining walls. To evaluate the fragility of the studied models, specific failure criterion was chosen for retaining walls based on the suggested methods in practice. Using numerical approaches, the effects of soil-wall interaction and wall rigidity on the seismic response of retaining walls were also evaluated in earthquake conditions for both cohesive and cohesionless backfill materials. According to the findings, practical correlations were presented for conducting the seismic design of retaining walls.
Book Synopsis Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions by : Francesco Silvestri
Download or read book Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions written by Francesco Silvestri and published by CRC Press. This book was released on 2019-10-22 with total page 5946 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions contains invited, keynote and theme lectures and regular papers presented at the 7th International Conference on Earthquake Geotechnical Engineering (Rome, Italy, 17-20 June 2019. The contributions deal with recent developments and advancements as well as case histories, field monitoring, experimental characterization, physical and analytical modelling, and applications related to the variety of environmental phenomena induced by earthquakes in soils and their effects on engineered systems interacting with them. The book is divided in the sections below: Invited papers Keynote papers Theme lectures Special Session on Large Scale Testing Special Session on Liquefact Projects Special Session on Lessons learned from recent earthquakes Special Session on the Central Italy earthquake Regular papers Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions provides a significant up-to-date collection of recent experiences and developments, and aims at engineers, geologists and seismologists, consultants, public and private contractors, local national and international authorities, and to all those involved in research and practice related to Earthquake Geotechnical Engineering.
Book Synopsis Seismic Analysis of Cantilever Retaining Walls by : Abdalla Mitwalli Mohamed Harraz
Download or read book Seismic Analysis of Cantilever Retaining Walls written by Abdalla Mitwalli Mohamed Harraz and published by . This book was released on 2003 with total page 1264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Wall-Soil Interface Parameters on Seismic Response of Retaining Walls by : Mohammadhashem Arabzadeh
Download or read book Effect of Wall-Soil Interface Parameters on Seismic Response of Retaining Walls written by Mohammadhashem Arabzadeh and published by . This book was released on 2018 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reinforced soil retaining walls are important public structures. Typically there are two kinds of reinforced soil retaining walls: cantilever retaining walls and Geosynthetic reinforced soil retaining walls. While seismic performance of retaining walls is very important for public safety in the event of an earthquake, there are very limited studies on that. The main objectives of the present thesis are to (i) examine the behavior of the interface between structure and soil under various loading and boundary conditions for RC cantilever retaining walls; (ii) conduct sensitivity study on the seismic response of such walls considering the key parameters such as the cohesion (C), friction angle (z), shear stiffness (Ks), normal stiffness (Kn) and dilation (|); and (iii) study the size (height) effect of the relating walls on the seismic performance of such walls. In order to achieve the above objectives, a baseline model of an RC cantilever retaining wall has been constructed for static and dynamic analysis using the Finite Difference Method (FDM). The data for the baseline model are obtained from a published work on seismic response such a wall subjected to an earthquake in India (1991 Uttarkashi earthquake, 20th October), which used the Finite Element Method (FEM) for analysis. The validated baseline model is then used for an extensive parametric study on the static and dynamic behavior of the system which is not available in the literature. Based on the results of numerical modeling, in the static condition, wall deformation was decreased by increasing the cohesion (C), friction angle (z), shear stiffness (Ks), normal stiffness (Kn) and dilation (|) values. The dynamic behavior of the wall was quite different from the static behavior. With increasing the values of shear strength parameters (Cohesion and friction angle) and also shear stiffness (Ks), the wall displacements increased whereas with increasing normal stiffness (Kn) value, the wall deformation decreased. A sensitivity analysis of wall-soil interface parameters on seismic response of the retaining wall was carried out using the ground motion records from Canada earthquake motion database (6th March, Quebec, 2005) and the results were compared to the Uttarkashi earthquake in India. The results of this comparison showed that the response parameters in terms of the retaining wall deformation are similar for both earthquakes. Moreover, parametric studies on the behavior of the soil retaining walls under Montreal earthquake with three different heights (3 m, 6 m and 9 m), and two different types of soil (clay and sand) and eight input earthquakes motions were performed. Results show that the behavior of wall facing in terms of displacement in both horizontal and vertical direction is different, and the type of soil has a main role in the wall deformation. Finally, a statistical estimation of parameters between soil and retaining wall structure was done. According to this statistical study, cumulative percentage distribution of cohesion (C) and stiffness parameters (shear and normal) against wall deformation were calculated. Then, lower and upper boundary ranges of wall-soil parameters were established for both static and dynamic condition.
