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Author: Griffin Enyart
Publisher:
ISBN:
Category : Earthquake engineering
Languages : en
Pages : 218
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Book Description
A hybrid testing system was developed to evaluate the seismic performance of a structural system by physically testing part of the structure, called a physical substructure, while numerically simulating the rest of the structure using a computer model. Instead of building a full sized structural specimen, hybrid testing allows researchers to build a complex substructure to be tested experimentally while the relatively simple part of the structure is numerically simulated. A versatile hybrid testing system was developed at Western Michigan University which includes a seismic simulator (often called a shake table), a reaction/loading system and an advanced hybrid testing controller. Such a testing system was used to simulate the seismic response of a three story structure whose top story was installed with motion mitigation devices (i.e.: dampers). The physical substructure is the top story with damper, which was installed on the shake table, and the numerical substructure is the lower two stories simulated in the computer. The boundry motions between the physical and numerical substructure were numerically simulated and applied to the top story using the shake table. Test results as well as the development of the test system were presented and discussed in this thesis.
Author: Griffin Enyart
Publisher:
ISBN:
Category : Earthquake engineering
Languages : en
Pages : 218
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Book Description
A hybrid testing system was developed to evaluate the seismic performance of a structural system by physically testing part of the structure, called a physical substructure, while numerically simulating the rest of the structure using a computer model. Instead of building a full sized structural specimen, hybrid testing allows researchers to build a complex substructure to be tested experimentally while the relatively simple part of the structure is numerically simulated. A versatile hybrid testing system was developed at Western Michigan University which includes a seismic simulator (often called a shake table), a reaction/loading system and an advanced hybrid testing controller. Such a testing system was used to simulate the seismic response of a three story structure whose top story was installed with motion mitigation devices (i.e.: dampers). The physical substructure is the top story with damper, which was installed on the shake table, and the numerical substructure is the lower two stories simulated in the computer. The boundry motions between the physical and numerical substructure were numerically simulated and applied to the top story using the shake table. Test results as well as the development of the test system were presented and discussed in this thesis.
Author: Chelsea Griffith
Publisher:
ISBN:
Category : Structural engineering
Languages : en
Pages : 144
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Book Description
Pseudodynamic hybrid simulation technique was developed to evaluate structural seismic performance by physically testing the critical portion with the remaining structure simulated using a numerical model in the computer. An incremental approach was adopted in developing the control scheme to suit multiple testing facilities and test specimens. First the small scale, predictable specimen was utilized to investigate techniques of improving stability, slowing down the loading rate and triggering the accurate force measurement in a series of at benchmark scale experiments in the Laboratory of Earthquake and Structural Simulation at Western Michigan University (WMU). A step/hold command scheme was developed and results matched well to those obtained from the purely numerical simulations of the analytical model setup based on the cyclic tests. Then a series of open and closed loop PSD hybrid simulations of increasing amplitude were conducted at large scale in the Structural Engineering Laboratory at University of Alabama. A ramp/hold displacement command scheme with flexible definition on the ramp phase were developed to the address the excessive vibrations due to the very high speed actuator. The final control scheme was applied the large scale PSD hybrid simulation of a two story wood frame building with a physical first story wood shear wall and numerical second story and reasonable seismic response were achieved. The results of this study serve as a basis for developing the simulation technique for the large scale hybrid simulation that that will be conducted at the NEES equipment site at the University of Buffalo.
Author: Gian Paolo Cimellaro
Publisher: Springer
ISBN: 3319063944
Category : Science
Languages : en
Pages : 329
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Book Description
The book is a tribute to the research contribution of Professor Andrei Reinhorn in the field of earthquake engineering. It covers all the aspects connected to earthquake engineering starting from computational methods, hybrid testing and control, resilience and seismic protection which have been the main research topics in the field of earthquake engineering in the last 30 years. These were all investigated by Prof. Reinhorn throughout his career. The book provides the most recent advancements in these four different fields, including contributions coming from six different countries giving an international outlook to the topics.
Author: Riadh Al-Mahaidi
Publisher: Springer
ISBN: 9811058679
Category : Science
Languages : en
Pages : 92
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Book Description
This book describes the multi-axis substructure testing (MAST) system, a simulator developed at Swinburne University of Technology, Australia, which provides state-of-the-art technology for large-scale hybrid testing of structures under realistic scenarios depicting extreme events. The book also demonstrates the responses of physical specimens while they serve as part of the virtual computer model of the full structure subjected to extreme dynamic forces. Experimental studies using the MAST system are expected to enhance design and construction methods and significantly improve the repair and retrofitting of structures endangered by natural disasters and man-made hazards, providing a direct benefit to society by improving public safety and the re silience of the built environment. An additional benefit is increased sustainability in the form of reduced direct and indirect economic losses and social and environmental impacts in the face of extreme events. This book will be of interest to researchers and advanced practitioners in the fields of structural earthquake engineering, geotechnical earthquake engineering, engineering seismology, and experimental dynamics, including seismic qualification.
Author: Oreste S. Bursi
Publisher: Springer Science & Business Media
ISBN: 3211094458
Category : Science
Languages : en
Pages : 347
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Book Description
The articles in this book describe new developments in the area of structural testing, particularly those based upon the principle of fusing numerical and experimental methods such as real-time dynamic substructuring and hardware-in-the loop testing. In addition to the hybrid methods, chapters on the latest develoments in more established techniques, such as shaking table testing, provide a completely up-to-date survey of structural testing methods. The book is characterized by a multidisciplinary nature of the work that integrates cutting-edge research from the fields of non-linear dynamics, automatic control, numerical analysis, system modelling and mechatronics.
Author: Peng Pan
Publisher: Butterworth-Heinemann
ISBN: 0128033924
Category : Computers
Languages : en
Pages : 240
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Book Description
Development of Online Hybrid Testing: Theory and Applications to Structural Engineering provides comprehensive treatments of several topics pertinent to substructure online hybrid tests. Emphasis has been placed on explaining the three frameworks: the host-station framework, separated model framework and peer to peer framework These have been developed within the Internet environment and are particularly suitable for distributed hybrid testing. In order to help readers to understand the essence of online hybrid testing and further to build up their own systems, an engineering practice has been introduced at the end of this book with the source code appended. Development of Online Hybrid Testing: Theory and Applications to Structural Engineering is primarily written for readers with some background in structural dynamics, finite elements, and computer science. Material that has previously only appeared in journal articles has been consolidated and simplified which provides the reader with a perspective of the state-of-the-art. Presents basics and implementations of time integration algorithms for online hybrid tests, along with the applications for real engineering projects Includes current progress on the development of substructure online hybrid tests as a means of investigating the seismic behaviour of large-scale structures Provides source code for the example tests
Author: Georgios Giotis
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Hybrid simulation methods have attracted significant interest from researchers in structural engineering to accurately assess the seismic performance of structures. To implement hybrid simulations in a testing facility, it is necessary to properly control the boundary conditions of physically tested specimens. The objective of this study is to propose and implement a methodology for performing hybrid simulations when a limited number of actuators are available and the full control of the boundary conditions is not possible. The developed methodology is employed to evaluate the seismic performance of a RC structure where one of the first storey columns is experimentally tested with testing equipment which can control only two DOF instead of the three required for columns subjected to planar motions. The seismic assessment is performed for the cases of an intact, repaired and retrofitted structure, where externally applied Carbon Fiber Reinforced Polymer (CFRP) fabric is used for repairing and retrofitting.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 271
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Book Description
The increased need for experimental verification of the seismic performance of conventional and novel structural systems has resulted in highly sophisticated dynamic test procedures. Hybrid simulation, including pseudo-dynamic testing of experimental substructures, offers an efficient method for assessment of dynamic and rate-dependent behavior of large-scale structural systems subjected to earthquake excitation. Compared to earthquake simulations using shake tables, hybrid simulation may have significant advantages in terms of cost, scale, geometry, and required physical mass of structures and components that can be tested. However, recent hybrid simulations have been limited to simplified structural models with only a few degrees of freedom. This is primarily due to the fact that hybrid simulation is a relatively new test method that is still being improved through research. Currently, the major challenges for using hybrid simulation in large and complex structural systems are the lack of robust simulation algorithms, and the sensitivity of the results to experimental errors in the presence of high-frequency modes. The main motivation for this research is to develop reliable test procedures that can be easily applied to fast and real-time hybrid simulations of large and complex structural systems. It is also attempted to develop test procedures that are effective for geographically distributed hybrid simulations. In this dissertation, recent developments to improve the accuracy and stability of hybrid simulation are described using the state-of-the-art pseudo-dynamic hybrid simulation system at the Structural Engineering and Earthquake Simulation Laboratory, University at Buffalo. In particular, delay compensation procedures are examined, and new methods are proposed. These methods are based on the correction of tracking errors in force measurement signal, and using the numerical integration procedure for prediction and compensation of command displacement signal. A new online procedure is proposed for estimation of delay during the simulation, and is shown to have better performance compared to existing online delay estimation methods. Furthermore, two numerical integration procedures are introduced for hybrid simulation, which are shown to improve the stability and accuracy properties of the simulation. The proposed integration algorithms use experimental measurements to iterate within implicit scheme and also take advantage of a new approach to estimate the tangent stiffness matrix of experimental substructures. For assessment of the reliability of hybrid simulation results, energy-based error monitors are proposed to examine the severity of experimental and numerical errors. These measures are then used to demonstrate the improved accuracy offered by new algorithms proposed here through analytical and numerical studies, and numerical and experimental simulations.
Author: Dyah Kusumastuti
Publisher:
ISBN:
Category : Earthquake engineering
Languages : en
Pages : 288
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Book Description
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309090644
Category : Science
Languages : en
Pages : 193
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Book Description
The Network for Earthquake Engineering Simulation (NEES), administered by the National Science Foundation (NSF), is scheduled to become operational in 2004. These network sites will perform a range of experiments to test and validate complex computer models being developed to simulate the behavior of structures subjected to earthquakes. To assist in this effort, the NSF requested the National Research Council(NRC) to frame the major questions to be addressed by and to develop a long-term research agenda for NEES. Preventing Earthquake Disasters presents an overview of the grand challenge including six critical research problems making up that challenge. The report also provides an assessment of earthquake engineering research issues and the role of information technology in that research effort, and a research plan for NEES.
