Laserfiche WebLink
--Page-2-eft <br /> Comment#6: The response to the comment regarding using a perforated shear wall design indicates that a <br /> solid wall has a series of openings punched through solid wall. These walls, being part of the <br /> seismic force resisting system, are intended to be considered special concrete shear walls and <br /> subject to the provisions ofACI 314 18.10. These walls have individual wall piers between <br /> openings and beam-like elements that form above and below the openings. These wall piers <br /> and beam elements in the shear walls are subjected to the strength and detailing provisions <br /> per ACI318-14 Sec 18.10.7for coupling beams and Sec 18.10.8 for wall piers where the <br /> required, even if they are viewed as perforated walls. If these perforated walls are not <br /> intended to contain detailing for individual wall piers and/or coupling beams, it is assumed <br /> that the solid wall elements spanning floor-to-floor are acting as shear walls. Please clam <br /> and provide calculations and detailing for these wall piers or beam elements or indicate <br /> where full-height shear walls occur. Please update drawings, details, and shear wall <br /> calculations as required. <br /> Response:The RAM Structural System and RAM Concrete structural analysis model, <br /> and current typical wall reinforcing detailing shown on sheet S4.03,takes into account <br /> the fact that we are utilizing a continuous concrete wall with the openings designed as <br /> perforations within a continuous wall. Our analysis also takes into account the design <br /> requirements of ACI 318-14 Section 18.10 for the vertical wall segment design <br /> requirements.See added calculation sheets B211-B218 for information regarding <br /> Section 18.10.8.In the cases where the wall segments are long enough to be designed as <br /> walls,the reinforcing requirements indicated in detail 2/4.03 also complies with <br /> Ordinary Boundary Element requirements per ACI 318-14 as 6 is less than 0.2 f c.See <br /> the calculation sheets in section Shear Wall Analysis for additional information. <br /> We have made revisions to detail 1/S4.03 extending the length of the tie spacing to <br /> extend 18"beyond the top and bottom of openings and revised detail 2/S4.03 to comply <br /> with Section 18.10. <br /> Lochsa Engineering lochsa.com 1-866-606-9784 <br />