Hi,
I am not understanding how we determine the direction of main ( reinf required to resist design bending moment) and secondary reinf based on local x and y axis of plates.
Based on the wiki page I gone through found that the LONG REINF – Reinforcement required along the longitudinal direction ( along local X axis of the plates ). This reinforcement is reported in terms of area required per unit width of slab. TRANS REINF - Reinforcement required along the transverse direction ( along local Y axis of the plates ). This reinforcement is reported in terms of area required per unit width of slab.
Wiki page link : https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/29226/how-do-i-interpret-the-element-design-results-per-the-aci-code
Can you please clarify that
1) Is the LONG REINF main reinforcement provided to resist design bending moment or is it along the longer direction of the slab?
2) Is the TRANS REINF secondary reinforcement or the reinforcement perpendicular to the longer side?
The LONG reinforcement is provided to resist Mx bending moment ( Moment ABOUT the local Y axis for the plates ). The reinforcement is parallel to the local X axis.
The TRANS reinforcement is provided to resist My bending moment ( Moment ABOUT the local X axis for the plates ). The reinforcement is parallel to the local Y axis.
Thank you. LONG reinforcement may not be the main reinf provided to resit design bending moment. I modeled a one way slab supporting on longer edges, where the plates local x axis is along the global x axis(i.e., along longer side) and y axis is along the global z axis(i.e., shorter side). We usually provide main reinf along shorter side. Do we call LONG REINF as main reinforcement in this case?
Correct. LONG reinforcement does not mean MAIN reinforcement. It should be rather viewed as reinforcement parallel to element local X. For example in your case, LONG reinforcement will be the secondary reinforcement and the TRANS reinforcement which is parallel to plate local Y, would be the MAIN reinforcement.
Thank you very much for your answer. It is clear to me now.