Definitions of block and brick
Brick and Block common types of Walls partitions in concrete structures. They have many different types some of them:
Bricks made of clay or concrete, have a rectangular section with maximum dimensions 25x12x13 cm. Common type 25x12x6cm
Blocks made of clay or concrete CMU, have dimensions L ( length) not exceeded 6b(width). Common dimensions is 40x20x20 cm, 40x25x20cm.
Solid building unit: have net area greater than 75% gross area.
Perforated building unit: when net area from 25%to50% from gross area.
Hollow building unit: when unit area from 50% to 75% area gross.
Expansion Joint in walls.
In continues walls like fences, maximum distance between expansion joints is 12m for clay brick wall and 9 m for concrete blocks.
Loads to be taken in design of Walls:
Minimum loads should be taking is own weight + 25kg/m2.
The design of Walls not depending on structure loads only, sound and heat isolation should be reviewed.
Allowed horizontal deflection due to lateral loads
1/240 for rigid finishing ( like glass)
1/120 for flexible finishing like plaster
Compressive strength for wall
Clay brick should be minimum 50kg/cm2, and concrete blocks minimum 200kg/cm2.
The Compressive strength for a wall made from clay brick should be a minimum 8kg/cm2, and 15kg/cm2 for concrete blocks.
Massonary wall hight and thickness:
Maximum masonry wall hight not exceeded 1/18 wall thickness.
At wall thickness equal 1/18 hight, maximum distance between pilasters or piers may take as follow:
For wall thickness 10cm use 1.8 m
For wall thickness 15 cm use 2.7m
For wall thickness 20cm use 2.65m
For wall thickness 30cm use 5.5m
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