Section Capacity (BS5950-1:2000)
In addition or in lieu of the requirements of BS5950-1:1990 these provisions apply.
- For class 3 sections the program uses the elastic section modulus in all cases, it does not calculate an effective plastic modulus as allowed by 4.2.5.1.
- Per 4.2.5 Mc is limited to 1.2pyZ for simply supported beams and 1.5pyZ for other continuous beams. In RAM Frame the 1.5pyZ limit is applied if any one of the ends of the beam are fixed in the major axis to a column. For the cantilever portion the 1.2pyZ limit applies at all times.
Note: If the beam is fixed major axis, but the columns are pinned, the beam will still be considered fixed for the purposes of limiting Mc. To avoid this situation, always model the fixity conditions of the beams to represent the true fixity condition of the beam. In RAM Steel Beam the 1.2pyZ limit applies at all times.