Influence of Optimum Number of Sag-Rods and Sag-Rod Spacing on Deformations of Zee Profile

Kanchan S. Takale
2018 International Journal for Research in Applied Science and Engineering Technology  
An unbraced compression flange of any single-web flexural member tends to buckle laterally under vertical loading. Zee profile being point symmetric is more liable to lateral buckling because its shear centre and the its point of load application is different. Sag-rods is a widely and popularly adopted technique of bracing system to curb the lateral torsional buckling of Zee profile. Roof bracing system of sag rods is commonly installed in roof framing to curb the unbraced length of the Zee
more » ... ngth of the Zee purlin. It is a practical approach and diminutive solid theory is available for the suitability of number of sag rods. Sag-Rods are being used on a rule of thumb. It has practically proven to be effective in minimizing the lateral deformations by reducing the unbraced length of the Zee profile. This reduced unbraced length is adopted for design calculations. Also, the spacing in between the sag rods is considers to be in the range of L/3 to L/4. It is a dilemma to choose the optimum one. This paper discusses the deformations of Z purblind under various load combinations, positioning of sag-rods, requirement of number of sag-rods and their optimum spacing for a Zee profile.
doi:10.22214/ijraset.2018.5243 fatcat:xrrkn43ikvdixji2lfevzua75y