The present study aims to evaluate the suitability of infilled steel tube columns of fibre reinforced polymer confined concrete in vulnerable areas of instability in the basement of the Bhuj Earthquake Epicentral Zone, Gujarat , India. In order to understand the sub-surface structural characteristics of a sedimentary basin, basement mapping is necessary, which in turn paves a way for better tectonics understanding. Based on the nature of the subsurface system , it is important to design all the major civil structures. A field experiment with a relatively new geophysical technique, Magnetotellurics, was performed in order to define certain zones and to find new types of construction. In the Bhuj earthquake epicentral zone and 21 earthquake epicentral zone, a broad band (1000-0.001 Hz) magnetotelluric analysis has been taken up. In order to understand the deep structure of the area, sites were occupied by three profiles during March-April 2001. In addition, the area surrounding Bhuj was previously tested with a variety of MT profiles, and in addition to seismotectonic studies, the subsurface structure is well restricted from the point of view of hydrocarbon exploration. Owing to the extreme loading conditions, structural damage takes place in the columns and results in inadequate stiffness and ductility. In this report, the findings of the investigation are described in two steps. In step I, considering these databases, the results obtained along a 130 km long profile from Mundra to Rapar oriented in the NE-SW direction passing through the epicentre are presented. The structure of the subsurface has shown an interesting connexion with surface deformation. A new structure of the basement and associated seismotectonics of the area was established. The key result is related to the configuration of the basement and surface ruptures. In phase II, our experimental research is expanded to determine the efficiency of in-filled steel columns of fibre reinforced polymer wrapped concrete subjected to lateral loading in seismic regions. The parameters involved in this research process are the type of fibre The shape and shape of a steel pipe. The results revealed that, compared to columns, the Fibre reinforced polymer wrapped concrete in-filled steel columns have greater load carrying ability and capacity for energy absorption and exhibit ductile behaviour. In civil structures in vulnerable zones defined from the first stage of our research, we suggest following these kinds of columns. An significant correlation is observed from the analysis of surface deformations mapped at several locations across the epicentral zone and the basement undulations of the present research. Considering the tectonic forces acting on the fragile sedimentary formations, this has been clarified, whereas the hard rock basement is relatively stable.

Author (s) Details

Dr. S. Kareemunnisa Begum
Department of Geophysics, Andhra University, Visakhapatnam, India

Dr. P. Gajalakshmi
ESPAC and Department of Civil Engineering, B. S. Abdur Rahman Crescent Institute of Science & Technology, Chennai, India.

Dr. J. Revathy
ESPAC and Department of Civil Engineering, B. S. Abdur Rahman Crescent Institute of Science & Technology, Chennai, India

Dr. T. Harinarayana
ESPAC and Department of Mechanical Engineering, B. S. Abdur Rahman Crescent Institute of Science & Technology, Chennai, India. Earlier worked at GERMI, Gujarat and CSIR-NGRI, Hyderabad

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