ACI-318 2002

This section describes the additional checks performed by RAM Concrete Beam when the ACI-318-02 code is selected. The ACI 318-02 code implementation builds off of ACI 318-99 and different or additional checks are performed only where outlined in this section.

Beam Reinforcement Detailing

Section 7.13.2.2 - At least 2 bars top and bottom must be made continuous for perimeter beams.
Section 7.13.2.4 - For non-perimeter beams when closed stirrups or hoops are not used, at least 2 bottom bars must be made continuous.

Deep Beams

Section 10.7 and 11.8 - Deep beam definition has been made consistent for flexure and shear. Members are considered deep beams if:

Clear span < 4 x member depth.

It is the user's responsibility to design the member as a deep beam when the member is loaded with a concentrated load in the region within twice the member depth from face of support. The program will not generate a design warning for this situation.

Special Provisions

Sections R21.3.4.2 and R21.12.3 - Gravity load factors for the loads on beams have now been explicitly defined. The new factors are used when the ACI 318-02 code is selected in RAM Concrete Analysis mode and the ACI option is selected for IMF or SMF in the Frame Criteria dialog box.
Section 21.12.4.2- When shear reinforcement is required hoops must be used instead of regular stirrups.

Impact on RAM Concrete Beam Design

Below is a list of changes that might be noticed by the user in the design due to the differences between ACI 318-99 and ACI 318-02

More beams may get Deep Beam design warnings because the definition of the deep beam has been slightly changed.
Some bar cutoff locations may be different in the ACI 318-02 design due to the live load factors in the load combinations.
All lateral beams that are IMF or SMF will need to have hoop reinforcement. In the ACI 318-99 only SMF members need hoop reinforcement.
Due to the changes to the load combinations it is possible that some transverse reinforcement sections will require reinforcement for the ACI 318-02 design because the provided shear capacity of concrete is less than two times the required capacity.
Due to the new provisions in 7.13.2.2 a/b for a minimum of 2 bars continuous top and bottom for perimeters beams there may be some additional design warning. It is a good idea to change the Detailing Defaults criteria to reduce the design warnings.