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9/28/2011 <br />EMERGENCY PREPAREDNESS <br />STRUCTURES J <br />WIND LOAD <br />(CONTINUED) <br />Old Chapter 5 <br />Proposed Chapter 5 <br />Justification <br />Justification <br />The provision is <br />essentially a distillation <br />of the wind load <br />provision in American <br />National Standards <br />Institute (ANSI) A58. 1- <br />1972 and 1982. <br />section 2311 offers a <br />somewhat simplified <br />procedure and does <br />not make provisions <br />for dynamic effects. <br />ASCE standard provisions for <br />wind loads on typical low -rise <br />buildings (2005 version) <br />incorporate a factor of safety <br />to peak wind loads on <br />structural systems. <br />Present formula <br />outdated. <br />Proposed formula <br />based upon <br />recent data and <br />studies, including <br />topographic <br />maps. <br />National Standard <br />when FEMA <br />funding is <br />provided. <br />9/28/2011 <br />EMERGENCY PREPAREDNESS <br />STRUCTURES J <br />Current Chapter 5 <br />Proposed Chapter 5 <br />Justification <br />No Provision <br />Sets out special requirements <br />for Community Storm Shelters <br />in accordance with <br />ICC /NSSA -500. (section 421.2) <br />National Standard <br />when FEMA <br />funding is <br />provided. <br />9/28/2011 <br />