Laserfiche WebLink
Page 2 oft/ <br /> required. Additionally,please address how a redundancy factor of p = 1.0 is <br /> achieved in both directions for the wood framed levels and concrete podium <br /> levels. <br /> Response: Per Table 12.6-1, since we are performing a two stage analysis, <br /> and the upper portion utilizes of light frame construction and the lower <br /> podium structure is not exceeding 2 stories above the base, and the <br /> structure is in Risk Category II,we are permitted to use the Equivalent <br /> Lateral Force procedure. We have revised the Analysis procedure note to <br /> clarify that we are using the Equivalent Lateral Force procedure for each <br /> individual stage in the Structural Loads section of the General Structural <br /> Notes shown on sheet S0.03 <br /> In response to your question regarding accidental torsion and the <br /> accidental torsional amplification,we have included an amplified <br /> accidental torsional moment per ASCE 7-10 section 12.8.4.3 in our <br /> structural analysis.Please see added calculation sheet A16 for the <br /> accidental amplification factor. <br /> In response to your question regarding the use of p= 1.0 for the concrete <br /> podium and wood superstructure,according to ASCE 7-10 12.3.4.2,b.,if <br /> a structure is regular in plan and there are at least 2 bays of seismic <br /> force-resisting perimeter framing on each side of the structure in each <br /> orthogonal direction at each story resisting more than 35% of the base <br /> shear,then p= 1. <br /> Comment#4: For the concrete podium and wood framed structures,please provide the <br /> material stiffness properties utilized in the design for walls, diaphragms, and <br /> any other modeling elements contributing to the stiffness of the structural <br /> model. <br /> Response: In response to your question regarding material stiffness <br /> properties utilized in the design for walls, diaphragms, and any other <br /> modeling elements contributing to the stiffness of the structural model for <br /> the design of the concrete podium,Ram Structural Systems uses cracked <br /> concrete sections in conjunction with the wall lengths, thicknesses and <br /> includes wall openings in calculating wall stiffness when determining <br /> center of rigidity and distribution of lateral shear wall loads. The wood <br /> superstructure was analyzed using flexible diaphragm analysis,therefore <br /> a structural model was not implemented for rigid force distribution. <br /> Comment#5: Please provide diaphragm designs for the concrete podium and wood framing <br /> are not provided in the calculation package,please include items such as <br /> Lochsa Engineering www.iochsa.com 1-866-606-9784 <br />