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El. knyga: Seismic Analysis and Design using the Endurance Time Method 2nd edition [Taylor & Francis e-book]

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"The endurance time method (ETM) is a seismic analysis procedure in which intensifying dynamic excitations are used as the loading function, and it provides many unique benefits in the design of structures. It can largely reduce the computational effort needed for the response history analysis of structures. This aids in the practical application of response history-based analysis in problems involving very large models and/or requiring numerous analyses to achieve optimal design goals. A single responsehistory analysis through ETM provides an estimate of the system response at the entire range of seismic intensities of interest, thus making it ideal for applications such as seismic risk assessment, life-cycle cost analysis, and value-based seismic design. Conceptual simplicity also makes ETM a useful tool for preliminary response history analysis of structural systems. Features: Presents full coverage of the subject from basic concepts to advanced applied topics. Provides a coherent text on endurance time excitation functions that are essential in endurance time analysis. Seismic Analysis and Design using the Endurance Time Method serves as a comprehensive resource for students, researchers, and practicing structural engineers who want to familiarize themselves with the concepts and applications of the endurance time method (ETM) as a useful tool for dynamic structural analysis"--

The endurance time method (ETM) is a seismic analysis procedure in which intensifying dynamic excitations are used as the loading function, and it provides many unique benefits in the design of structures. It can largely reduce the computational effort needed for the response history analysis of structures. This aids in the practical application of response history-based analysis in problems involving very large models and/or requiring numerous analyses to achieve optimal design goals. A single response history analysis through ETM provides an estimate of the system response at the entire range of seismic intensities of interest, thus making it ideal for applications such as seismic risk assessment, life-cycle cost analysis, and value-based seismic design. Conceptual simplicity also makes ETM a useful tool for preliminary response history analysis of structural systems.

Features:

  • Presents full coverage of the subject from basic concepts to advanced applied topics.

  • Provides a coherent text on endurance time excitation functions that are essential in endurance time analysis.

Seismic Analysis and Design using the Endurance Time Method

serves as a comprehensive resource for students, researchers, and practicing structural engineers who want to familiarize themselves with the concepts and applications of the endurance time method (ETM) as a useful tool for dynamic structural analysis.



Seismic Analysis and Design using the Endurance Time Method serves as a comprehensive resource for students, researchers, and practicing structural engineers who want to familiarize themselves with the concepts and applications of the endurance time method (ETM) as a useful tool for dynamic structural analysis.

Foreword ix
Preface xi
Biographies xiii
Chapter 1 Introduction to the Endurance Time Method
1(22)
1.1 Introduction
1(1)
1.2 The Endurance Time Concept
2(2)
1.3 Endurance Time Excitation Functions
4(4)
1.3.1 Generation of Intensifying Accelerograms
5(3)
1.4 Analysis Method
8(2)
1.5 Endurance Criteria
10(1)
1.6 Application of Intensifying Excitation to Linear SDOF Systems
10(5)
1.7 Application to MDOF Systems
15(4)
1.8 Summary and Conclusions
19(4)
Chapter 2 Properties of the Endurance Time Excitation Functions
23(18)
2.1 Introduction
23(1)
2.2 Second Generation of ET Acceleration Functions
24(1)
2.3 Comparison of ET Response Spectrum with a Real Earthquake
25(1)
2.4 Basic Ground-motion Properties
25(3)
2.5 Frequency Content
28(1)
2.6 Power Spectral Density
29(1)
2.7 Other Ground-motion Parameters
30(2)
2.7.1 Energy Parameters
31(1)
2.8 Intensity Parameters
32(3)
2.9 Period Parameters
35(1)
2.10 Peak Velocity Acceleration Ratio
36(1)
2.11 Cumulative Absolute Velocity
36(1)
2.12 Sustained Maximum Acceleration (SMA) and Velocity (SMV)
37(1)
2.13 Effective Design Acceleration (EDA)
37(1)
2.14 Summary and Conclusions
38(3)
Chapter 3 Duration Properties of the Endurance Time Excitation Functions
41(14)
3.1 Introduction
41(1)
3.2 Ground Motion Selection
42(1)
3.3 ET Excitation Functions
42(2)
3.4 A Review of Definitions of Strong-Motion Duration
44(3)
3.5 Comparison between ET Accelerograms and Real Ground Motions
47(1)
3.6 Evaluation of Proposed Target Time
47(5)
3.7 Summary and Conclusions
52(3)
Chapter 4 Generating ET Excitation Functions by Numerical Optimization
55(22)
4.1 Introduction
55(1)
4.2 Generating ET Acceleration Functions
56(4)
4.3 Nonlinear Least Squares Formulation
60(3)
4.4 Improved ET Acceleration Functions
63(1)
4.5 Optimization of Long Duration ET Acceleration Functions
64(4)
4.6 Comparison of ETEFs in the Analysis of SDOF Systems
68(5)
4.7 Summary and Conclusions
73(1)
4.8 Nomenclature
74(3)
Chapter 5 Correlating Analysis Time with Intensity Indicators
77(20)
5.1 Introduction
77(1)
5.2 Endurance Time Method
78(2)
5.3 Multiple Intensity Levels in the Performance-based Design
80(1)
5.4 Correlation between Time in ET Analysis and Return Period
81(8)
5.5 Explanatory Case Study
89(3)
5.6 Summary and Conclusions
92(1)
5.7 Nomenclature
93(4)
Chapter 6 ET Analysis of Framed Structures
97(26)
6.1 Introduction
97(2)
6.2 Procedure for Application of the ET Method
99(2)
6.3 Specifications of Models, Ground Motions, and Acceleration Functions
101(4)
6.4 Comparison with Nonlinear Response History Analysis
105(12)
6.5 Application of the ET Method in Seismic Rehabilitation of Buildings
117(2)
6.6 Summary and Conclusions
119(4)
Chapter 7 Multicomponent Endurance Time Analysis
123(28)
7.1 Introduction
123(1)
7.2 Review of Code Provisions and Related Research
124(1)
7.3 Adaptation of the Endurance Time Method
125(2)
7.3.1 The Basic Concepts from the ET Method
125(2)
7.4 Characteristics of ET Acceleration Functions Used in This Study
127(1)
7.5 Comparison of ET Method with Conventional Approaches
127(2)
7.6 Structural Models
129(1)
7.7 Selection of Reference Ground Motions
129(3)
7.8 Multicomponent Analysis
132(14)
7.8.1 Scaling Procedure
132(1)
7.8.2 Multicomponent Analysis by the ET Method
133(13)
7.9 Summary and Conclusions
146(1)
7.10 Nomenclature
147(4)
Chapter 8 Performance-based Design with the Endurance Time Method
151(18)
8.1 Introduction
151(2)
8.2 Concepts from the Endurance Time Method
153(2)
8.3 Performance Levels
155(1)
8.4 Target and Performance Curves
156(3)
8.5 Definition and Application of Damage Levels
159(2)
8.6 Structural Model Frames Design
161(1)
8.7 Presentation of the Analysis Results
161(5)
8.8 Summary and Conclusions
166(1)
8.9 Nomenclature
167(2)
Chapter 9 Value-based Seismic Design with ET
169(28)
9.1 Introduction
169(2)
9.2 Background
171(2)
9.3 Application of the Endurance Time Method
173(1)
9.4 Prescriptive Seismic Design
174(2)
9.5 Performance-based Design
176(5)
9.6 Value-based Design
181(7)
9.6.1 Initial Costs
182(1)
9.6.2 Life-Cycle Cost
183(5)
9.7 Comparative Study
188(1)
9.8 Summary and Conclusions
188(4)
9.9 Nomenclature
192(5)
Chapter 10 Seismic-Resilient Design by ET
197(16)
10.1 Introduction
197(2)
10.2 Earthquakes and Resiliency
199(1)
10.3 Concepts of Endurance Time Method
199(3)
10.4 Value-based Seismic Design by the ET Method
202(3)
10.5 Case Study: Three-Story Steel Moment Frame
205(1)
10.6 Quantification of Resilience
206(4)
10.7 Summary and Conclusions
210(3)
Chapter 11 Sample Engineering Application: EDR Seismic Performance
213(26)
11.1 Introduction
213(2)
11.2 Basic Concepts from the Endurance Time Method
215(5)
11.3 Modeling the EDR Device in OpenSees
220(1)
11.4 Performance Assessment of EDR Devices by ET method
221(13)
11.5 Comparative Study
234(2)
11.6 Summary and Conclusions
236(3)
Index 239
Homayoon Estekanchi is a professor of Civil Engineering at Sharif University of Technology. He received his PhD in Civil Engineering from SUT in 1997 and has been a faculty member at SUT since then. He is a member of Iranian Construction Engineers Organization, ASCE, Iranian Inventors Association and several other professional associations. His research interests include a broad area of topics in structural and earthquake engineering with a special focus on the development of the Endurance Time Method and the Value Based Seismic Design.

Hassan Vafai has held position of professorship in civil engineering at different universities including: Sharif University of Technology, Washington State University and University of Arizona. He was founder and editor-in-chief of Scientia, a peer-reviewed international journal of science and technology. Throughout his professional career, he has received numerous awards and distinctions including: emeritus distinguished engineer by the National Academy of Sciences, Iran; an honorary doctorate by the Senatus Academicus of Moscow Region State Institution of Higher Education and the "Order of Palm Academiques," awarded by the Ministry of Education, Research and Technology of France.
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