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<br /> <br /> <br /> <br /> <br /> <br />3rd & Broadway, Santa Ana, CA <br />Volume 2 - Structural Calculations June 17, 2024 | Project # S21043.00 <br /> pg. 92 <br />5.3.3 MAT FOUNDATION DESIGN <br />The mat foundation design was performed using SAFE. The models were run using non -linear soil <br />springs in appropriate load combinations to take into account the inability of the soil to resist tension <br />forces. Perimeter foundation walls were included in the SAFE model, helping to ‘anchor’ the two <br />perimeter shear walls of the Hotel tower against base overturning. <br />The thickness of the mat was governed by the shear demand of the gravity columns and the lateral force <br />resisting elements. SAFE models were used to determine mat shear demand adjacent to columns, <br />shear walls and core walls. SAFE was also used to determine the flexural demand and required mat top <br />and bottom reinforcing at all locations. <br />Elevator pits within and adjacent to cores were modeled as 2 ft thick slabs, also checked for local shear <br />and moment demands. SAFE models with different widths of design strips were used to determine force <br />concentration and redirection occurring around the pits. <br />