Page 73 - Jabalpur_EQ

Chapter 3 Brick Masonry & Reintorced Concrete Bulldings

Figure 3-27. Damage to parapet wall, Govt. Blind, Deaf and Dumb School,

Kongwa.

mon place in most affected city areas. However, since chimneys are not part of
modern houses, their failure was seen only in residences of the colonial era. Often

parapet walls were unreinforced and their height exceeded two times of their
thickness. In such cases, parapet walls must be provided with vertical reinforce-
ment and they should be anchored back to roof or floor.

CODE PROVISIONSs
The Jabalpur and neighbouring areas affected by the earthquake fall in seismic

zone II of IS:1893-1984 (BIS 1984). In this zone, the Code expects shaking of
a
intensity VII on the MM scale. All buildings in this zone should be designed for
seismic loads. However, the ductility requirements for RC structures contained in
IS:13920-1993 (BIS 1993) are not required for office and residential buildings less

than five storeys, which make up most of the newer construction in the city. It
should be noted that a good earthquake-resistant design depends less on the con-
cept of lateral load coefficients and elastic spectra but more on the ductility and
In addition,
energy absorbing capacity of well detailed structural components.
the Code has no specific provisions or separate guidelines available for the design
and safety assessment of the weak RC frames with brick masonry infills, in spite
of the fact that brick infill walls are the most popular elements for constructing
exterior skin and interior partitions in RC frame structures in the country. Since

63
Jabalpur Earthquake of May 22, 1997