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Chapter 3 Brick Masonry & Reintorced Concrete Buildings

Lack of continuity

Figure 3-2. Schematic showing the lack of continuity in various modules of the
New Hostel, Agriculture University.

to strengthen the shear load paths of the connecting vertical structural members
of its various modules. It is also necessary to check the diaphragm for tensile
stresses near the re-entrant corners. The staircases need to be either relocated or
isolated from the rest of the building.

College of Agriculture Building, Agriculture University

The H-shaped building (Fig. 3-3) suffered damage to its masonry walls which is
concentrated at corners of the plan offsets, at the ends and the middle portion of
the building as shown in Figs. 3-4 and 3-5. These plan offsets lacked connection
to primary lateral elements of the buildings which also suffered out-of-plane fail-
ures. The damage to upper stories only could be due to the amplified ground
motions for the upper floors. Such corner damages were typical to many URMs
in the earthquake affected areas.

Vertical Discontinuity

5-Storey Himgiri Apartments, Wrighty Town
The vertical framing system which resists the lateral loads imposed by seismic
forces should be continuous to the foundation. Vertical discontinuity in a weak
RC frame with infill wall was created when all infilled walls were not continuous
to the foundation and, instead, they stopped at the second floor (Figs. 3-6 & 3-7).

Jabalpur Earthquake of May 22, 1997 44