Question
I entered a supporting reinforcement bars, but it doesn't affect the evaluation results.
Answer
For supporting reinforcement bars, the strength of the anchor bars can be used in place of the concrete failure strengths Ncbg and Vcbg for tension and shear.
When using the "Supporting Reinforcement Placement" feature, Vcbg (concrete breaking strength), Vcpg (pryout breaking strength), and Vs,av ("supporting reinforcement strength") are compared and the maximum of these is determined as the holding capacity. If Vs,av is less than Vcb or Vcpg, the evaluation report does not output the strength for the reinforcement.
For example, the holding capacity Vcbg for the "alternating-orthogonal direction" in the model before adding support bars is 371.584 kN. The number of effective anchor bars in the model is 4, and the Vs,av being calculated is approximately 241 kN.
Since the strength of the anchor bar to resist shear is lower than the breaking strength of the concrete, the holding capacity is determined to be 371.584 kN, and the evaluation results do not change.
For example, if the number of effective anchor bars is increased to 20, the strength of the anchor bars resisting shear will be greater than the breaking strength of the concrete, so that value will be used as the retention performance, and the evaluation result may vary from N.G. to O.K., as shown in the figure below.
[ Strength when increasing the number of anchor bars from 4 to 20 ]