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Earthquake Engineering Challenges and Trends

HONORING

LUIS ESTEVA

Editor

J. J. Pérez-Gavilán E.

September 2006

Symposium Committee J J Pérez-Gavilán E (coordination) Sergio Alcocer Mario Ordaz

Edition technical support Maximino Reséndiz Technical Secretariat Ing. Javier Palomas Promotion and linking secretariat Lic. Maria Olvido

Earthquake Engineering Challenges and Trends J. J. Pérez-Gavilán (Ed.) © 2006 Instituto de Ingeniería Universidad Nacional Autónoma de México www.iingen.unam.mx Printed by Impresión Offset Express Published September 2006 ISBN: 970-32-3699-5 PRINTED IN MEXICO

Dr. Luis Esteva

Luis Esteva’s award The upcoming curved plates represent the two vital aspects of Dr. Luis Esteva: human and intellectual values, respectively. The plates terminate in an ascending curve to signify that his value as human and scientist keeps on growing. Each of the seven transverse horizontal irregular plates represents ten years of his life, the irregularity meaning that life is not smooth or planar. The shaky aspects of the lamina represent an earthquake. All the structure comes out from earth.

Foreword When a person has an enviable academic record, full of fruitful activities and of relevant contributions to a discipline, the idea to honor this person is by all means appropriate and rewarding. However, when such an individual also outstands for his/her generosity and friendship, a commemoration becomes mandatory. In the case of Professor Luis Esteva, it was the occasion of his seventieth birthday, on January 31, 2005, the perfect time to commemorate his active and fruitful career. In contrast, the year 2005 was also marked by the very sad memories of the people that lost their lives in and of all the damage inflicted by the 1985 Mexico earthquakes. Therefore, 20 years after was a good time for discussion and meditation of the needed actions to accelerate the reduction of seismic risk. With both senses of joy and meditation, the Institute of Engineering at the National University of Mexico, UNAM, decided to organize a tribute symposium. To discuss about the needs and possible strategies for coping with the increase in seismic risk in the world, a selected group of long-time colleagues and friends of Luis was invited for this occasion. Distinguished researchers and practitioners in the field of earthquake engineering attended from all over the world, presenting their thoughts and state-of-the art reports on the subject. It is the aim of this book to present the thoughtful contributions of the symposium participants. Also included are some of the papers of Luis Esteva which help to understand different topics of the discipline. The book is intended for both practicing and research specialists on earthquake engineering. We are deeply indebted to the authors who accepted the invitation to attend the symposium, wrote thoughtful papers, presented them at the symposium, chaired the sessions, and participated in lively discussions.

Mexico City August, 2006

Sergio M. Alcocer Director Institute of Engineering National University of Mexico, UNAM

Preface This book is about earthquake engineering science. It was set up with selected contributions, past and recent, of Prof. Luis Esteva and the contributions of distinguished researchers around the world. In September 2005, long-time friends and colleagues of Luis were gathered by the Institute of Engineering at UNAM, in a symposium to honor Dr. Esteva, for his long and productive career, and for his many contributions to earthquake engineering in Mexico and the world. The book is organized into two parts. In the first part the bibliography of Luis Esteva is compiled, including research reports, chapters in books and journal papers but not including conference papers. The bibliography is followed by the transcription of selected contributions of Luis Esteva. The collection includes two renowned general manuscri