Sanjib Das - STAAD.PRO CE - Seismic Analysis Using IS 1893 (PART-1)-2016

Sanjib Das

Exton, Pennsylvania, USA

Sanjib Das

Sanjib Das is a Manager at Bentley Systems, Kolkata, India. He holds a masters degree in structural engineering. He has more than 15 years of experience in dealing with critical issues in STAAD.Pro software. He is involved in providing solutions to critical structural engineering problems.

His research area includes earthquake engineering, earthquake-resistant design of RCC and steel structures, and application of software in the field of earthquake engineering. He has many national and internal publications. He has been the technical lead for the implementation of IS 1893 (Part 1):2016 in STAAD.Pro CONNECT Edition.

STAAD.Pro CE Seismic Analysis Using IS 1893 (Part 1):2016

First Edition

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Library of Congress Control Number: 2019947064

ISBN: 978-1-934493-58-8

This book is dedicated to all the users of STAAD.Pro who have used it for their projects over the years. The feedback and support of our users over the years have driven this project. Fundamentally what we love to do is create, so it is wonderful watching the product and its users grow!

Last year we had an idea of helping our users get a better understanding of STAAD.Pro CE Seismic Analysis. To accomplish this, we planned to write a text to cover seismic design criteria as per Indian standard, the process of using different parameters required for equivalent static and dynamic analyses. Our problem was tractable because recent earthquakes in India indicate that many of collapses of buildings were due to lack of considerations of the basic concepts of earthquake behaviour in design.

STAAD.Pro CE Seismic Analysis using IS 1893 (Part 1):2016 was the fruit of months of effort of multiple Bentley colleagues and of course our users. Firstly, we would like to thank our author Sanjib Das who made it happen. Information about the author is provided in the section About the Author. We would also like to thank Shreyanka Bhattacharjee and Aritra Lodh for their commitment to collaborate and help the author with the manuscript. Many engineers, technical support representatives and product specialists at Bentley Systems reviewed the chapters and accompanying examples to provide valuable inputs and to shape the text into its current form.

Vikash Pandey

Manager at Bentley Institute Press

Global urbanization, concentrating populations in large coastal cities, has resulted in more than half the worlds population who are now susceptible to one or more natural hazards. In India, three of the four largest cities lie in seismic zone IV subject to some of the highest earthquake loading and risk. The risk to life and limb is just one consideration, with so many people concentrated in such close proximity in large cities. The importance of ensuring resilience in their infrastructure is greater than ever. Over the last couple of decades, more than 200,000 lives and 4,000,000,000,000 in USD direct and indirect economic losses can be attributed to earthquakes (Munich RE). The ability of our communities and society to react and recover for earthquakes has become as much of consideration in our design codes as the need to keep the population safe.

Structural seismic design codes evolve with lessons learned in each major earthquake experience. Early codes adapted to the poor performance of irregular and discontinuous structures adding higher strength and ductility requirements. More recent events have highlighted the need to consider vertical accelerations and the secondary loading impacts that result from structure weight acting on a deformed structure. Minimum design forces and ductility factors have been adjusted as we learn more about near- and far-field seismic loading characteristics along with increasing resilience requirements as more buildings need to be designed not just to ensure life safety but also with intent to return to operation soon after seismic events.

The design codes have also adapted to technological advancements, allowing us to continuously improve the way we idealize and simulate the behaviour and performance of our buildings subject to seismic forces. When Amit Das started Research Engineers International in 1981, wrote STAAD, one of the first STructural Analysis And Design software solutions for the PC, he created the foundation for improving the productivity of engineers and our ability to more accurately simulate the performance on thousands of structures analysed and designed with STAAD in the last four decades. STAAD.Pro CONNECT Edition today has continued to stay up to date in the implementation of the myriad of the latest IS 1893 analysis and design code requirements, and the need to understand the application of code requirements in the software engineers use is more important than ever.

It is with this purpose that Sanjib Das has written this formative book on the basis of the evolution and application of the latest IS 1893 design code in STAAD.Pro. The book provides an overview of science of earthquake engineering from source causes to measurement standards. Sanjib takes readers through a short history of the origins and organization of structural design standards and identifies the latest changes made in the IS 1893 Seismic Standard. In the core, Sanjib does an exceptional job describing the various analysis techniques, static, dynamic, linear, nonlinear prescribed by the code, providing an excellent balance of the technical with the practical application in STAAD.Pro CONNECT Edition. It is clear that Sanjibs extensive engineering and STAAD experience have provided a practical guide and filter to present and interpret the design code intent gained though his close interaction with members of the design code committee.