The load combinations are based on Table 2 of Clause 2.4 of BS 5950:Part1:1990. The following combinations are created:

1.4 DL ± 1.4 Notional DL

1.4 DL ± 1.4 Notional DL + 1.6 LL ± 1.6 Notional LL

1.0 DL ± 1.0 Notional DL + 1.6 LL ± 1.6 Notional LL

1.0 DL ± 1.4 W

1.4 DL ± 1.4 W

1.2 DL + 1.2 LL ± 1.2 W

1.0 DL ± SF1 E

1.4 DL ± SF1 E

1.2 DL + 1.2 LL ± SF2 E

where SF1 and SF2 are user specified factors for seismic loads. The default values for SF1 and SF2 are 1.4 and 1.2 respectively. Note that there is no explicit seismic load requirement in the British Code. However, it is anticipated that users in countries that have adopted the British Code may run seismic load cases based on some other codes if necessary.