Thursday, February 2, 2017
How to design R.C.C lintels
Now-a-days, the R.C.C lintels are mostly recognized to extent the openings for doors, windows, etc. in a structure owing to their firmness, inflexibility, fire resistance power, cost-effectiveness and simplicity in construction. R.C.C lintels are recommended for all the loads and for any span. The width of lintel is similar to width of wall. Depth of lintel is based on the length of span and magnitude of loading.
Lintel can be made from various materials. Such as steel, wood, stone, RCC, etc.
Generally, the most effective material for lintel is RCC (Reinforced Cement Concrete). Generally, applied concrete ratio for RCC lintel is 1:2:4.
On the basis of the casting methods, RCC lintel is classified as Pre-cast RCC lintel and Cast-in-place RCC lintel.
DESIGN METHOD OF R.C.C LINTEL
There are similarities between the design methods of a lintel (single span or continuous having a few openings) and the design methods of a simple beam.
1. The lintel width is same as the wall thickness.
2. Provide an appropriate depth of the lintel.
3. Select the operational span of the lintel (maintain rational end bearings and real depth).
4. Assume W as the aggregate weight of the masonry work wrapped in the triangle, supposing that conditions authorize triangular load of the workmanship on the lintel.
5. Estimate the extreme bending moment (M1) at the centre of the lintel ( because of the triangular load).
M1 = Wl/6
Now estimate the maximum bending moment (M2) because of the self-weight (w) of the lintel per metre length.
M2 = wl^2/8
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