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9/28/2011 <br />COMPARISONS <br />BILL 270, DRAFT 3 <br />9/28/2011 <br />WIND LOAD <br />Current Chapter 5 <br />Proposed Chapter 5 <br />Justification <br />section 2311 BASE <br />Section 1609.1.1 <br />Present formula <br />WIND SPEED is the <br />Determination of wind loads. <br />outdated. <br />fastest -mile wind <br />Wind loads on every building <br />Proposed formula <br />association with an <br />or structure shall be <br />based upon <br />annual probability of <br />determined in accordance <br />recent data and <br />0.02 measured at a <br />with Chapter 6 of ASCE 7 -05. <br />studies, including <br />point 33 feet above <br />topographic <br />the ground for an <br />Section 1609.1.4. or W1010.2 <br />maps. <br />area having high <br />basic wind speed (3- second <br />exposure to category <br />gust), miles per hour. V3s =105 <br />C. v= 80mph... <br />(continued on next <br />slide) <br />mph. <br />(continued on next slide) <br />9/28/2011 <br />