Structural Failure Analysis of Earthquake Affected Buildings in Gorkha (Nepal) Earthquake 2015 in Kathmandu Valley

Abstract

The major earthquake in April 25, 2015 of Mw 7.8 and aftershock of intensity Mw 7.3 on May 12, 2015 has caused not only a substantial death toll and huge economic losses, but also heavy damage to many buildings. This paper outlines the common observed damage patterns of different types of buildings in Kathmandu valley induced by the earthquake and their constructional deficiencies..We visited Department Of Urban Development and Building Construction (DUDBC) of Nepal Government, and Nepal Society for Earthquake Technology (NSET) and got various information regarding structural damages caused by Gorkha earthquake. After acquiring knowledge on this topic through internet and from NSET and DUDBC, the structural failure analysis of buildings affected during the earthquake in Kathmandu Valley was done by photo observation. Both unreinforced masonry buildings and reinforced masonry structures suffered low to heavy destruction. The construction and structural deficiencies were identified to be the major cause of failure, however local soil amplification, foundation problems, liquefaction associated damages and local settlement related damages were also significantly observed during this earthquake and reported in the paper. The Gorkha earthquake sequences delivered unprecedented opportunity to augment the understanding on seismic performance of the buildings. This paper is also motivated to point out the faintness in the past to current constructional practice of buildings, provide preventive measure and convey awareness to stake holders for future safer building construction practice.