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Singhal, Vaibhav
- Performance of Residential Buildings during the M 7.8 Gorkha (Nepal) Earthquake of 25 April 2015
Abstract Views :284 |
PDF Views:176
Authors
Affiliations
1 Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur, IN
1 Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur, IN
Source
Current Science, Vol 109, No 11 (2015), Pagination: 2126-2136Abstract
The M 7.8 earthquake of 25 April 2015 was a significant event in the long seismic history of the Eastern Himalayas, which caused more than 8000 casualties; widespread destruction of residential, commercial and cultural heritage structures, surface fissures and landslides in the western and central regions of Nepal. It was followed by a strong aftershock of M 7.3 after 17 days of the main event which caused further damage. These events provided a unique opportunity to study the vulnerability of the built environment and reassess the risk exposure of the region which is undergoing rapid urbanization without adequate preparedness for seismic safety. A field trip was undertaken covering the affected regions of Nepal and adjoining Indian states of Uttar Pradesh and Bihar. This article discusses the general observations in the earthquake affected regions, with special emphasis on the seismic performance of residential structures in the Kathmandu valley region.Keywords
Earthquake Effects, Reinforced Concrete Frame, Seismic Vulnerability, Unreinforced Masonry.Full Text
References
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- Rai, D. C., Mondal, G., Singhal, V., Parool, N., Pradhan, T. and Mitra, K., Reconnaissance report of the M 6.9 Sikkim (India– Nepal border) earthquake of 18 September 2011. Geomat. Nat. Hazard. Risk, 2012, 3, 99–111.
- Seismic Vulnerability of Monastery Temples of Stone Masonry in Sikkim Himalaya
Abstract Views :265 |
PDF Views:102
Authors
Affiliations
1 Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur 208 016, IN
2 Department of Civil and Environment Engineering, Indian Institute of Technology Patna, Bihta 801 103, IN
3 Mueser Rutledge Consulting Engineers, 14 Penn Plaza, 225 West 34th Street, 6th Floor, New York, NY 10122, US
4 Department of Civil, Environment, and Geo-Engineering, University of Minnesota, 500 Pillsbury Drive S.E., Minneapolis, MN 55455, US
1 Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur 208 016, IN
2 Department of Civil and Environment Engineering, Indian Institute of Technology Patna, Bihta 801 103, IN
3 Mueser Rutledge Consulting Engineers, 14 Penn Plaza, 225 West 34th Street, 6th Floor, New York, NY 10122, US
4 Department of Civil, Environment, and Geo-Engineering, University of Minnesota, 500 Pillsbury Drive S.E., Minneapolis, MN 55455, US
Source
Current Science, Vol 110, No 10 (2016), Pagination: 1947-1957Abstract
Buddhist monasteries in the Sikkim region have conserved and portrayed the art of Tibetan and Chinese architectural style through centuries. These historic structures have sustained varied degrees of damage due to earlier earthquakes. Their performance in the recent Sikkim earthquake of M 6.9 on 18 September 2011 shows their high seismic vulnerability. A quick seismic assessment using certain simplified indices suggests higher vulnerability of damage for these heritage structures. A post-earthquake ambient vibration test established these monastery temples as shortperiod structures with fundamental period of 0.23 to 0.37 s. A finite element analysis of one of these temples has been done to study its dynamic behaviour. The response spectrum and static nonlinear pushover analysis highlighted vulnerable portions of stone masonry walls and provided useful insights for proper retrofitting to mitigate damage in future earthquakes.Keywords
Ambient Vibration, Finite Element Analysis, Monasteries, Seismic Vulnerability, Stone Masonry.Full Text
- M 6.7, 4 January 2016 Imphal Earthquake:Dismal Performance of Publicly-Funded Buildings
Abstract Views :243 |
PDF Views:119
Authors
Affiliations
1 Department of Civil Engineering, IIT Kanpur, Kanpur 208 016, IN
2 Department of Civil Engineering, IIT Guwahati, Guwahati 781 039, IN
3 Department of Civil and Environmental Engineering, IIT Patna, Bihta 801 103, IN
1 Department of Civil Engineering, IIT Kanpur, Kanpur 208 016, IN
2 Department of Civil Engineering, IIT Guwahati, Guwahati 781 039, IN
3 Department of Civil and Environmental Engineering, IIT Patna, Bihta 801 103, IN
Source
Current Science, Vol 113, No 12 (2017), Pagination: 2341-2350Abstract
The M 6.7 Imphal Earthquake of 4 January 2016 caused devastation in Manipur state and adjoining areas. This event presented another opportunity to understand the earthquake risk of the affected region as well as of the North-Eastern Himalayan region, which have similar patterns of seismicity, built environment and construction practices. Many dramatic collapses and damages, especially to publicly-funded buildings were disproportionate to the observed intensity of shaking. This was primarily due to poor compliance with seismic codes, inferior quality of raw materials and shoddy workmanship. Consequently, the seismic risk in the region is growing at an alarming pace with increasing inventory of vulnerable construction. This article discusses seismic performance of three publicly-funded buildings in the recent earthquake and highlights the vulnerability of such inventories along with the below par preparedness of the government agencies in dealing with such calamities. This event should be regarded as a preview of what is likely to happen in the event of a greater shaking expected for the region and should hasten the community to take necessary steps to identify seismic vulnerabilities and improve construction practices through effective intervention.Keywords
Earthquake Effects, Reinforced Concrete Frame, Seismic Vulnerability.Full Text
References
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- Rai, D. C., Mondal, G., Singhal, V., Parool, N., Pradhan, T. and Mitra, K., Reconnaissance report of the M 6.9 Sikkim (India–Nepal border) earthquake of 18 September 2011. Geomat. Nat. Haz. Risk, 2012, 3, 99–111.