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The main objective of a course on earthquake-resistant design of structures is to introduce students to the phenomenon of earthquakes and the process, measurements, and factors that affect the design of structures in seismic areas. This objective is achieved by understanding the fundamentals of the theory of vibrations necessary to comprehend and analyse the mutual dynamics of earthquakes and structures. The student is also familiarized with the codal provisions as well as aseismic design methodology.
According to Earthquakes Today, around 500,000 earthquakes occur each year; 100,000 of these can actually be felt. The magnitude and destructive consequences of earthquakes have serious implications. The destruction and damage of constructed and natural environment and the loss and impairment of human life are of prime concern. A notable feature of the disaster caused by earthquakes is that harm to life is associated almost entirely with man-made structures, e.g., collapse of buildings, bridges, dams.
During an earthquake, when the ground shakes at a building site, the buildings foundations vibrate in a manner that is similar to the surrounding ground. To overcome this effect, research has spawned numerous innovations now common in earthquake engineering, including ductile detailing of concrete structures, improved connections for moment frames, base-isolation technology, energydissipation technology, and computing tools. Current research activities are focused on three areas: performance-based design, development of damageresistant systems, and improvement in the ability to predict the occurrence and intensity of earthquakes.
Our knowledge about earthquakes has advanced enormously during the past couple of decades. Corresponding advances have also been made in our understanding of the behaviour of structures, and consequently new and stringent specifications have been introduced and enforced. In this second edition, the dynamics of structures is dealt with in detail to give the book completeness. Further, with the revision of the code IS 800 in 2007, the design philosophy recommended is limit state design.
Consequently, the treatment of steel structures in Chapter 9 has been overhauled completely, focusing on the new code IS 800: 2007. While working on the second edition, the goal has been to retain the organization of the book and to develop and update the topics more carefully and logically. The text has been reviewed closely and objectively modified. An attempt has been made to provide a simple, balanced, and exhaustive coverage of the information needed for the design of earthquake-resistant structures. The first edition of the book was prepared with an understanding that students undertaking a course on earthquake-resistant design of structures must already have the basic knowledge of dynamics of structures.
However, feedback and suggestions from students, faculty, and reviewers suggest that the book must cover dynamics of structures in greater detail. Although textbooks are available on structural dynamics as well as earthquake-resistant design of structures, this book is an effort to cover a range of structures in a balanced way, which was lacking in other books. Numerous solved examples have been added to assist the reader in developing a full understanding of the application of the theory involved. Moreover, each of these examples has been carefully chosen to supplement and extend the ideas and concepts given in the text.
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