Part 1 – Problem 13: Assuming a Seismic Design Category D, which we had calculated in the Geotechnical deliverable, Section 12.5.4 of the ASCE manual allows using Section 12.5.3a or 12.5.3b to satisfy the additional requirements of the low Seismic Design Category. The first is to design for “100% of the forces for one direction, plus 30% of the force in the perpendicular direction”. The alternative option is to have a simultaneous application of orthogonal ground motions, which would result in only 4 analyses. Since the SLC instruction asks us to analyze each direction separately do we use 12.5.3a or do we simply apply 100% of the force in only one direction?