Structural Design – Minimum Standard
Thumb rules for Structural Design of RCC Structures: It is advisable to use superior structural design software like ETabs or Staad Pro for making the design of structures. There exist different types of variables in making the design of a structure and therefore no minimum standards are perfect.
This guide is very helpful for making the design of very small structures, as for instance up to G+1 floors. It is recommended to apply good software for structural designer instead of manual methods. Manual method is only applicable for checks.
Real design is accomplished by applying the computers, through very advanced design concepts like pushover analysis, seismic analysis, wind loads simulation and various advanced processes.
Design of RCC Structural Components: This construction article sheds light on the minimum standards that should be undertaken for making the design of RCC structural components of a structure, like columns, beams, slab and foundation. Besides, the explanation is also provided for the minimum safe standards for the reinforcing bars which should be employed for the design of the above mentioned Structural Components.
Minimum cross-sectional dimension for a Column is 9”x 9” (225MM x 225MM). But to get rid of slenderness issues, a rectangular column with dimension 9″x 12″ (225 MM x 300 MM) should be designed for maintaining safety.
It is recommended to utilize M20 grade concrete for construction as per IS 456:2000 standard. The minimum steel required in a 9″ x 9″ column is 4 bars of 12 MM containing stirrups of 8 MM steel rings at a gapping of 150 MM centre to centre.
In a 9″ x 12″ column, two more bars should be included to easily manage the total to 6 bars having 12 MM diameter. This design is trustworthy for up to G+1 floors.
Minimum RCC beam size should not be under 9″x 9″(225MM X 225MM), with an extra slab thickness of 125 MM. It will be perfect to apply a minimum of 4 bars, with 2 bars having 12 MM thickness in the bottom of the beam, and 2 bars having 10 MM at the top of the beam.
A concrete cover having 40 MM dimension should be used. Besides, M20 grade of concrete (1 part cement : 1.5 parts sand : 3 parts aggregate : 0.5 parts water) should also be used.
Minimum thickness of RCC slab should be 5″ (125MM) as a slab may comprise of electrical pipes which are implanted into them with 0.5″ dimension or more for internal wiring to significantly decreases slab depths at specific places. It leads to cracking, weakening and water leakage throughout rains. Therefore, a minimum thickness of 5″ should have been retained.
Minimum size of foundation for a single storey of G+1 building should be 1m x 1m, where safe bearing strength of soil is 30 tonnes per square meter, and the approaching load on the column does not surpass 30 tonnes. Minimum depth of footing should be 4′underneath ground level. It is suggested to go to depths up to had strata.
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