EFFECTS OF WEB WIDTH AND WEB POSITION ON SHEAR RESISTANCE PERFORMANCE OF UFC BEAMS

Abstract

 This study aims to clarify the shear resistance performance of UFC beams with various cross section. Static loading tests were conducted on 15 UFC beams whose parameters were web position, web width and taper slope. The results showed that, three types of the shear failure modes could be observed, where the failed area in the web, the compressive and tensile flanges were clearly different. Besides, the failure modes where the larger area of a specimen was failed, had also larger shear strength. Moreover, as lessing the width of one web, the shear strength tended to be enhanced due to the restriction of fiber orientation near boundary. Based on these, the empirical equation to evaluate the effect of a width of one web on the shear strength was proposed from the regression analysis. Finally, it can be clarified that from the verification of 24 beams including previous studies, this proposed equation shows fairly good accuracy as the correction factor of web width against the shear strength of UFC beams.