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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. 25 <br />4.2.1 MODEL STIFFNESS <br />The stiffness of each structural component is listed in the table below. These values are determined <br />using the building code guidelines. <br /> <br />Table 4.2-3: ETABS Model Stiffness Parameters for DBE Analysis <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />The concrete modulus of elasticity is dependent on the concrete strength and is derived using the formula <br />57,000√(f’c) per ACI 318-14. <br /> <br /> <br /> <br />Element Serviceability <br />Core Walls Flexural: 0.7 Ig <br />Shear: 1.0 Av <br />Shear Walls Flexural: 0.7 Ig <br />Shear: 1.0 Av <br />Coupling Beams Flexural: 0.35 Ig <br />Shear: 1.0 Av <br />Diaphragms Flexural: 0.25 Ig <br />Shear: 1.0 Av <br />Concrete Columns <br />Flexural: 0.70 Ig <br />Shear: 1.0 Av <br />Axial: 1.0 Ag <br />