The Indian Institute of Technology, Bombay organized an Institute lecture by Dr. Svetlana Brzev, Adjunct Professor, University of British and visiting Professor, IIT Gandhinagar on 6th May 2019.
Details of the talk are as given below :
Title of the talk: Seismic Vulnerability Index for Non-Ductile Low-Rise
Reinforced Concrete Frame Buildings with Masonry Infills
Date : 06 May 2019
Time : 4:00 pm
Venue : Seminar Hall, First Floor, Department of Civil Engineering
Abstract of the talk:
Reinforced concrete (RC) frames with brick masonry infills is the prevalent building construction practice for residential and commercial buildings in India and neighboring countries such as Nepal. Design and detailing of masonry infills and RC frame members influence the failure mechanisms in these buildings. A desirable, flexural failure mechanism is characterized by the development of flexural plastic hinges at locations where largest bending moments develop – initially in the beams and subsequently in the columns. When RC columns have small cross-sectional dimensions and are inadequately reinforced to develop a flexural failure mechanism, a less desirable shear failure mechanism may take place. As a result, these RC frame buildings behave essentially like wall structures. Several three- to five-storey buildings of this type were severely damaged and/or collapsed in the April 25, 2015 Gorkha earthquake (M 7.8), even in areas characterized with low-to-moderate shaking intensity such as Kathmandu Valley (MMI intensity of VI and VII).
The speaker presented the results of a collaborative Canadian and Nepalese research study which involved a field survey of 98 damaged RC buildings of this typology after the 2015 Nepal earthquake. The main objective of the study was to correlate the observed damage grades for individual buildings with the corresponding wall density index, that is, a ratio of the sum of cross-sectional areas of all walls in each major direction of the building plan and the total floor plan area. The damage classification was based on the European Macroseismic Scale (EMS-98), but the researchers introduced modifications to account for the shear failure mechanism. The results of the study showed that wall index can be used to assess the seismic vulnerability of existing RC buildings with masonry infills that are characterized by the shear-dominant behavior. Other similar indicators, such as column index, were considered in the study but did not show a good correlation with the extent of damage in these buildings.
About the Speaker:
Dr. Svetlana Brzev has 35 years of combined research, consulting, and teaching experience in the areas of structural and earthquake engineering. She is an Adjunct Professor at the University of British Columbia, Canada and has been a Visiting Professor at the Indian Institute of Technology Gandhinagar since 2014. She was a structural engineering faculty at the Department of Civil Engineering, British Columbia Institute of Technology from 2000 to 2016. She received her B.S. and M.S. degrees in Civil/Structural Engineering from the University of Belgrade, Serbia, and Ph.D. degree in Earthquake Engineering from the University of Roorkee.
Dr. Brzev served as an international seismic engineering consultant to the World Bank and the Government of Maharashtra (GOM) after the 1993 Latur earthquake (1994-1999). She led the development of the guidelines for rebuilding and retrofitting of housing in-situ for the GOM’s post-earthquake rehabilitation project. Dr. Brzev served on the Board of Directors of the Masonry Society and was a Vice-President of the Earthquake Engineering Research Institute. She was the founding Editor-in-Chief of the EERI’s World Housing Encyclopedia (2000-2005). She currently serves on the Board of Directors of the International Association of Earthquake Engineering.Dr. Brzev has published more than 150 papers and reports and has co-authored three textbooks related to design of masonry and reinforced concrete structures. In 2015, she was named a Fellow of the Engineers Canada for her contribution to the engineering profession in Canada.