Critical Appraisal ofGust FactorMethod forWind Loads as Per Indian Standard.
Journal Title: International Journal of Engineering and Science Invention - Year 2018, Vol 7, Issue 4
Abstract
Development Of Low Density High Strength Construction Materials, Advancement In Computation And Analysis Tools Have Resulted In Tall And Flexible Structures Which Are Susceptible To Dynamic Wind Loading Effects. Indian Wind Loading Codal Provisions In Its Second Revision, IS 875 (Part 3) 1987 Has Included Gust Factor Method To Account For Dynamic Nature Of Wind For Flexible Structures For The First Time As Codal Provisions Like Its Predecessor Are Based On Static Method And Basic Wind Speed Map Is Based On Statistical Analysis Of 3-Second Yearly Maximum Wind Speeds. Hourly Mean Wind Speeds Required In Gust Factor Method Have Been Recommended To Be Obtained From Peak Winds By Using Conversion Table Which Is Not Based On Indian Environmental Conditions.For Critically Examining The Gust Factor Method Incorporated In The Present Code Overall Effect Of Wind On Two Tall Buildings Has Been Computed. The Wind Loads Computed By Gust Factor Method Incorporated In The Code And Those Based On Statistical Analysis Of Hourly Mean Wind Speed Data And Taken From Literature Show Wide Variations In The Values. The Values Of Wind Forces Along Heights Of Buildings, Base Shears And Overturning Moments In All The Four Terrain Categories Obtained As Per Gust Factor Method Incorporated In The Code Are Consistently More Than Those Obtained By Using Hourly Mean Wind Speeds Based On Statistical Analysis Of Hourly Mean Wind Speed Data Used In Gust Factor Method Instead Of Those Obtained By Using Approximate Conversion Table.Perusal Of Results Shows That The Values Of Wind Forces, Base Shears And Base Moments As Estimated By Gust Factor Method Incorporated In The Code Are Overestimated To The Large Extent As Compared To Those Based On Statistical Analysis Of Hourly Mean Wind Speed Data Pertaining To Indian Environmental Conditions.
Authors and Affiliations
Er. Mayank Sharma, Dr. Shruti Sharma, Er. Bhupinder Singh, Er. Ritu Goyal
Keywords
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