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Author: Mauricio Alejandro Munoz-Alegria Publisher: ISBN: Category : Earthquake engineering Languages : en Pages : 175
Book Description
Current seismic regulations allow earthquake energy dissipation via inelastic behaviour of structures providing that collapse is avoided. Considering that this philosophy can negatively impact due to loss of function of critical structures, mitigation systems are currently being explored by researches. In the last decades a new concept for reducing structural response has emerged. By allowing soil plastic deformations and foundation lift-off, structural performance can be improved. However, more research is required in order to better understand this phenomenon. This thesis concerns an experimental investigation into the structural response of buildings allowed to uplift when subjected to near-source earthquakes considering nonlinear soil-foundation-structure-interaction (NSFSI). Considering that gravity cannot be neglected in scaled models allowed to uplift, a new modelling approach was developed to account for gravity effects. Based on this method, a small scale model of a low rise building was built. Inelastic behaviour of the superstructure was considered by means of replaceable plastic hinge components. To study the benefits of uplift and NSFSI on the structural response, 10 records of actual near-source earthquakes were considered and subsoil was simulated by means of sand in a box. The scaled model constructed using the modelling method developed in this research was validated and it was capable of simulating a more realistic uplift behaviour even at small excitations. The experimental results suggest that uplift is unavoidable and it can significantly reduce the response of the structure. When soil plastic deformation is considered, the response of the structure can be further reduced remaining practically elastic. In contrast, uplift can increase the absolute horizontal displacements of the structure when the supporting base is rigid but marginally increased when soil plastic deformations are permitted. Because of the impulsive loading of near-source earthquakes and soil plastic deformation of subsoil, permanent rotation of the footing was observed after the uplift.
Author: Mauricio Alejandro Munoz-Alegria Publisher: ISBN: Category : Earthquake engineering Languages : en Pages : 175
Book Description
Current seismic regulations allow earthquake energy dissipation via inelastic behaviour of structures providing that collapse is avoided. Considering that this philosophy can negatively impact due to loss of function of critical structures, mitigation systems are currently being explored by researches. In the last decades a new concept for reducing structural response has emerged. By allowing soil plastic deformations and foundation lift-off, structural performance can be improved. However, more research is required in order to better understand this phenomenon. This thesis concerns an experimental investigation into the structural response of buildings allowed to uplift when subjected to near-source earthquakes considering nonlinear soil-foundation-structure-interaction (NSFSI). Considering that gravity cannot be neglected in scaled models allowed to uplift, a new modelling approach was developed to account for gravity effects. Based on this method, a small scale model of a low rise building was built. Inelastic behaviour of the superstructure was considered by means of replaceable plastic hinge components. To study the benefits of uplift and NSFSI on the structural response, 10 records of actual near-source earthquakes were considered and subsoil was simulated by means of sand in a box. The scaled model constructed using the modelling method developed in this research was validated and it was capable of simulating a more realistic uplift behaviour even at small excitations. The experimental results suggest that uplift is unavoidable and it can significantly reduce the response of the structure. When soil plastic deformation is considered, the response of the structure can be further reduced remaining practically elastic. In contrast, uplift can increase the absolute horizontal displacements of the structure when the supporting base is rigid but marginally increased when soil plastic deformations are permitted. Because of the impulsive loading of near-source earthquakes and soil plastic deformation of subsoil, permanent rotation of the footing was observed after the uplift.
Author: A.S. Cakmak Publisher: Elsevier ISBN: 044460040X Category : Technology & Engineering Languages : en Pages : 382
Book Description
Despite advances in the field of geotechnical earthquake engineering, earthquakes continue to cause loss of life and property in one part of the world or another. The Third International Conference on Soil Dynamics and Earthquake Engineering, Princeton University, Princeton, New Jersey, USA, 22nd to 24th June 1987, provided an opportunity for participants from all over the world to share their expertise to enhance the role of mechanics and other disciplines as they relate to earthquake engineering. The edited proceedings of the conference are published in four volumes. This volume covers: Soil Structure Interaction under Dynamic Loads, Vibration of Machine Foundations, and Base Isolation in Earthquake Engineering. With its companion volumes, it is hoped that it will contribute to the further development of techniques, methods and innovative approaches in soil dynamics and earthquake engineering.
Author: Polat Gülkan Publisher: Springer Science & Business Media ISBN: 9401117551 Category : Science Languages : en Pages : 446
Book Description
For the last couple of decades it has been recognized that the foundation material on which a structure is constructed may interact dynamically with the structure during its response to dynamic excitation to the extent that the stresses and deflections in the system are modified from the values that would have been developed if it had been on a rigid foundation. This phenomenon is examined in detail in the book. The basic solutions are examined in time and frequency domains and finite element and boundary element solutions compared. Experimental investigations aimed at correlation and verification with theory are described in detail. A wide variety of SSI problems may be formulated and solved approximately using simplified models in lieu of rigorous procedures; the book gives a good overview of these methods. A feature which often lacks in other texts on the subject is the way in which dynamic behavior of soil can be modeled. Two contributors have addressed this problem from the computational and physical characterization viewpoints. The book illustrates practical areas with the analysis of tunnel linings and stiffness and damping of pile groups. Finally, design code provisions and derivation of design input motions complete this thorough overview of SSI in conventional engineering practice. Taken in its entirety the book, authored by fifteen well known experts, gives an in-depth review of soil-structure interaction across a broad spectrum of aspects usually not covered in a single volume. It should be a readily useable reference for the research worker as well as the advance level practitioner. (abstract) This book treats the dynamic soil-structure interaction phenomenon across a broad spectrum of aspects ranging from basic theory, simplified and rigorous solution techniques and their comparisons as well as successes in predicting experimentally recorded measurements. Dynamic soil behavior and practical problems are given thorough coverage. It is intended to serve both as a readily understandable reference work for the researcher and the advanced-level practitioner.
Author: Chandrakanth Bolisetti Publisher: ISBN: Category : Languages : en Pages : 328
Book Description
During an earthquake, the flexibility of the near-surface soil affects the dynamic response of the supported structure. This dynamic interaction is termed soil-structure interaction (SSI). Soil-structure interaction is important for performance-based design, which has seen increasing use in earthquake engineering in the United States in the last decade. Soil-structure interaction analysis is preceded by site-response analysis, which is the process of calculating the response of a soil profile to rock motion at depth. Soil flexibility also results in the interaction of adjacent structures through intermediate soil. This interaction is termed structure-soil-structure interaction (SSSI), which can be important for the performance assessment of buildings, especially those constructed in dense, urban areas. The studies presented in this dissertation share the common goal of a better understanding of the phenomena of site response, SSI and SSSI, and advancing the numerical tools that simulate these phenomena. The state-of-the-art in site-response and SSI analysis of buildings and nuclear structures involves the use of linear or equivalent-linear numerical methods that function in the frequency domain. However, nonlinear time-domain methods may be more appropriate for cases involving intense earthquakes that result in highly nonlinear soil and foundation response. Such nonlinear methods are available but rarely used due to the higher computational requirements and lack of experience with analysts and regulators. This dissertation assesses industry-standard equivalent linear and nonlinear site-response and SSI analysis programs, and provides practical guidelines on their usage. The assessment includes benchmarking the time-domain programs against frequency-domain programs for analyses involving almost linear soil response, and a comparison of the predictions of these programs for analyses involving highly nonlinear soil and foundation response. The assessment also identifies the various pitfalls that can be expected when using these programs and suggests workarounds. Structure-soil-structure interaction has been rarely studied, mainly due to the lack of experimental or field-based case-studies that demonstrate its effects on structural response. The US National Science Foundation funded a research project titled `Seismic Performance Assessment of Buildings in Dense Urban Environments' to understand the significance of SSSI in buildings through a series of centrifuge experiments and numerical simulations. The experiments involve small-scale building models with commonly-found superstructure and foundation configurations. This dissertation describes some of these centrifuge experiments, and their numerical simulations, which are comprehensive and performed using both equivalent-linear and nonlinear SSI analysis programs. The numerical and experimental results show that wave-based SSSI does not significantly affect the global response of the buildings considered in this study.
Author: C. Zhang Publisher: Elsevier ISBN: 0080530583 Category : Science Languages : en Pages : 335
Book Description
Dynamic Soil-structure interaction is one of the major topics in earthquake engineering and soil dynamics since it is closely related to the safety evaluation of many important engineering projects, such as nuclear power plants, to resist earthquakes. In dealing with the analysis of dynamic soil-structure interactions, one of the most difficult tasks is the modeling of unbounded media. To solve this problem, many numerical methods and techniques have been developed. This book summarizes the most recent developments and applications in the field of dynamic soil-structure interaction, both in China and Switzerland. An excellent book for scientists and engineers in civil engineering, structural engineering, geotechnical engineering and earthquake engineering.
Author: Tom Schanz Publisher: Springer Science & Business Media ISBN: 9048126975 Category : Science Languages : en Pages : 320
Book Description
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
Author: Rolando P. Orense Publisher: CRC Press ISBN: 0203838203 Category : Technology & Engineering Languages : en Pages : 258
Book Description
Soil-Foundation-Structure Interaction contains selected papers presented at the International Workshop on Soil-Foundation-Structure Interaction held in Auckland, New Zealand from 26-27 November 2009. The workshop was the venue for an international exchange of ideas, disseminating information about experiments, numerical models and practical en
Author: Jaime A. Mercado Publisher: ISBN: Category : Languages : en Pages : 175
Book Description
Soil-structure interaction (SSI) effects are relevant for the seismic analysis of tall buildings on shallow foundations since the dynamic behavior of structures is highly affected by the interaction between the superstructure and supporting soils. As part of earthquake-resistant designs of buildings, considering SSI effects in the analysis provides more realistic estimates of its performance during a seismic event, particularly when both the structure and soil undergo large demands that can compromise serviceability. Oversimplifications of structural or soil modeling in the analysis introduces variability and biases in the computed seismic response.
Author: Mauricio Alejandro Munoz-Alegria
Author: Mauricio Alejandro Munoz-Alegria
Author: A.S. Cakmak
Author: Polat Gülkan
Author: Chandrakanth Bolisetti
Author: C. Zhang
Author: Tom Schanz
Author: Rolando P. Orense
Author: Jonathan P. Stewart
Author: Jaime A. Mercado
Author: A. S. Cakmak