In: Civil Engineering
Answer There are various factors influencing the joist spacing on centre (O.C ) as given below
DEPTH OF STRUCTURAL MEMBERS Depth provided for structural members is most valid point. If the depth of the member is related to joist spacing of 24 inches O.C ,then the provided spacing will be very strong and having more stiffness.
FIBRE STRESS IN STRUCTURAL MEMBERS fibre stress in bending in structural members will play vital role in joist spacing. Joists and rafters will subjected to bend when external load is acting on beam there by top fibre of the beam will go under compression force and bottom layers will take tension force. But neutral layers won’t take any force. So that the fibre stress is more in the beam then the beam may not go for failure.
MODULUS OF ELASTICITY(E)the modulus of elasticity is also major factor in joist spacing which is less than 24 inches to O.C. we will calculate the E value by taking stress induced in the body to strain developed in the body (deformation). So that if the E value is more than the beam has more strength. The grade of the members which has been used is also gives a more strength if grade is higher.
These are the three major factors that influence the joist spacing which is less than 24 inches on centre (O.C)