12-19-2010, 12:04 PM

What are the equations & recommendations for Effective flange width of Flanged T and L beams as per ACI 318?

Equations are same or different for RC & PT flanged beams?

If we have Partial prestressed (i.e. some tensile stresses within code limit are permitted) PT flanged beam, We can use code specified equation to calculate effective flange with for positive span moment for which there are no tensile stresses induced in beam, but can we use same equation for support moment due to which some tensile stresses are induced. Do we need to reduce Effective Flanged width, C/S are (A) and Moment of inertia for calculation of stresses, moment capacities, deflections etc.? What are the ACI 318 recommendations for this issue?

Equations are same or different for RC & PT flanged beams?

If we have Partial prestressed (i.e. some tensile stresses within code limit are permitted) PT flanged beam, We can use code specified equation to calculate effective flange with for positive span moment for which there are no tensile stresses induced in beam, but can we use same equation for support moment due to which some tensile stresses are induced. Do we need to reduce Effective Flanged width, C/S are (A) and Moment of inertia for calculation of stresses, moment capacities, deflections etc.? What are the ACI 318 recommendations for this issue?