The capacity of the beams is based on BS 8110 and is shown for simply supported beams in both curve and table format. The capacities are shown for maximum reinforcement and specified as Muls, Msls, quls and qsls. Where maximum reinforcement isn’t necessary we will specify a lower degree of reinforcement.
Muls is the ultimate moment capacity and quls is the ultimate load in kN/m that can be applied to the beam in excess of the self weight. Muls and quls may never be exceeded.
Msls is the service moment capacity and qsls is the service load in kN/m that can be applied to the beam in excess of self weight. Msls and qsls are based on stress limitations for class 2 members as per BS 8110, clause 4.1.3, 4.3.4.2 and 4.3.4.3. Our design office can verify the capacities at serviceability limit state for class 1 and class 3 members.
The capacity of class 1 and lass 2 members are usually controlled by the concrete tension and compression limitations for service load conditions, while class 3 members are usually controlled by ultimate limit state conditions.
The shear capacity shall be checked in each individual case.
The beams meet the requirements of 1.5 hours fire resistance as a standard, however this can be increased if required on individual projects. |
