Laserfiche WebLink
<br /> <br /> <br /> <br /> <br /> <br />3rd & Broadway, Santa Ana, CA <br />Volume 2 - Structural Calculations June 17, 2024 | Project # S21043.00 <br /> pg. 59 <br />4.6.1 RESIDENTIAL BUILDING <br />Base Shear for Residential building Story Drift Check <br />The story drifts are checked for the unscaled modal base shear, Vt, per Section 12.9.1.4 of ASCE 7-16. <br />So the building drifts are checked using a response spectrum base shear of Vt scaled to gravity and <br />divided by R. <br />Story Drift Ratios for Residential building <br />The response spectrum base shear are applied to the structure through response spectrum cases for <br />earthquake along X and Y directions. Since building has Torsion Irregularity of Type 1a, the center of <br />mass displacements cannot be used for calculation of Story drifts per section 12.8.6. Instead, drifts must <br />be calculated at the location of maximum drift at any point on the floor plate. The following node was <br />selected for calculating story drifts as this points sees the greatest inter-story drift. <br />The story drift ratios are calculated for the node at each story. The elastic drift values are then magnified <br />by Cd / Ie = 5.0 as specified in ASCE 7-16 section 12.9.1.2 to reach the anticipated inelastic drift values. <br />The following figures present the inelastic story drift ratios, which satisfy the code limits. <br /> <br />Figure 4.6-1: Nodes for calculating inter-story drift ratio