Page 68 - Jabalpur_EQ

Chapter 3 Brick Masonry & Relnforced Concrote Bulldings

Figure 3-22. Out-of-plane
failure of masonry wall andjali
due to excessive slenderness
and poor anchorage, PG Hos-
tel building, Agriculture Uni-
versity.

KCULTURE

Clearly, by decreasing height to thickness ratio (i.e., slenderness) for top storey
walls and most importantly, by anchoring wall to the roof slab, such failures can
be easily avoided. The slenderness ratio of walls of one-storey buildings should
not be larger than 20 whereas for multi-storey buildings the slenderness should
be restricted to 14 and for top storeys it should be kept below 9 (BSSC 1992b).

Failure of free standing compound walls and parapets are also related phenom-
ena. A part of free standing wall fell down in the courtyard of New Hostel build-
ing of Agriculture University. The wall fell about the base course as no footing
was provided. Similar damage to compound walls of the Govt. Blind, Deaf and
Dumb school was noted too.

Jabalpur Earthquake of May 22, 1997 58