Wood I-Joists with Excessive Web Openings: An Experimental and Analytical Investigation
作者： Geoffrey C. Morrissey , David W. Dinehart , W. Gary Dunn
DOI: 10.1061/(ASCE)ST.1943-541X.0000013
关键词: Stress concentration 、 Tension (physics) 、 Ultimate failure 、 Shear (sheet metal) 、 Flange 、 Stress (mechanics) 、 Engineering 、 Structural engineering 、 Finite element method 、 Stiffness
摘要: Two series of tests with different depth wood I-joists were conducted to study the effects circular and square web openings placement steel angle retrofits at openings. Finite-element analysis all test configurations was used improve understanding how affect stiffness, stress distributions around openings, ultimate failure mechanisms. Test results show loads well above prescribed design loads; however, presence affected type modes. Control joists failed tension flange, whereas in shear through or by means directly attributable an opening. Ultimate capacity stiffness generally reduced a opening, located closer high areas producing worse results. Square lowered approximately 10% more than when same location. Steel improved if adequate retrofit length redistribute concentrations. models accurately predicted decreases due openings; predict improvement that not ascertained experimental
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