In the context of earthquake-resistant masonry features, Horizontal Bands are provided primarily to
- AIncrease the thermal insulation of the building.
- BConnect the walls together so they act as a single box-like unit during shaking.Correct
- CReduce the amount of cement required for the mortar.
- DSupport the vertical weight of the roof only.
Solution
Concept
Seismic Bands in Masonry Structures
Formula
N/A
Step-by-step solution
1. Analyze the purpose of horizontal seismic bands in masonry buildings. 2. Recognize that horizontal bands connect adjacent walls to ensure integrated box action during seismic shaking. 3. Select Option B as the correct answer.
Explanation
Horizontal bands (like lintel or plinth bands) bind the masonry walls together into a strong, unified box structure. During an earthquake, this box action prevents individual walls from separating, tilting, or collapsing outward.
Shortcut
To remember the purpose of Horizontal Seismic Bands, use the rule "Bands = Box Action": - Bands Tie Walls: Connects adjacent walls together into a single unit. - Box Action: Prevents individual walls from separating, tilting, or collapsing outward during earthquake shaking.
Common mistake
A common mistake is selecting option D by confusing seismic horizontal bands with structural lintels or beams meant only for gravity load transfer. In reality, horizontal seismic bands are specifically designed to tie orthogonal walls together to provide box action during an earthquake, preventing out-of-plane wall failures.
Correct answer: B) Connect the walls together so they act as a single box-like unit during shaking.