RAM Concept Help

Section 18.8.3 Minimum Reinforcement of Flexural Members (Prestressed)

Equation 10-6 is implemented

A cracked section analysis is performed to calculate the stress in the reinforcement.

Iteration is used to find the minimum number of bars and bonded tendon ducts that meets the criteria. A non-integral number of bars may be used.

The section width used to determine the spacing is the width of the solid areas of the extreme tension face. For beams with stems in tension, this will typically be the sum of the stem widths.

The spacing is considered as the width divided by the number of bars and bonded tendon ducts. An additional bar is not added to make the width start and end with a bar.

fs in bonded tendons is calculated as the difference between the stress in the bonded tendon due to the specified load moment and the decompression moment.

RAM Concept may use more reinforcement than "necessary" in two circumstances:

  • The reinforcement is necessary for equilibrium in the cracked section analysis.
  • Compression reinforcement added later in the design process lowers the reinforcement demands.

No check is made to ensure that the structure is post-tensioned.

Reinforcing bar stresses are limited to the minimum of (0.5 fpy) and 30 ksi.

No check is made to ensure that the structure is post-tensioned.