Effect of Detailing of Web Reinforcement on the Behavior of Bottle-shaped Struts

The effect of detailing of web reinforcement as per current design codes on the strength and serviceability behavior of bottle-shaped struts has been experimentally investigated, particularly in the context of codal minimum reinforcement requirements, by testing eleven scaled deep beams. The experimentally obtained efficiency factors of the bottle-shaped struts besides being significantly higher than the values given in the ACI 318-08 were also found to be sensitive to the amount of web reinforcement. The minimum web reinforcement requirements specified in current design codes were found to be adequate for controlling service load crack widths though the unreinforced bottle-shaped struts allowed in the ACI code were observed to violate the maximum crack width requirements. It has been shown that the transformation equation in the ACI code does not accurately represent the relationship between the strut efficiency factor and the amount of transverse reinforcement whereas a corrected version of the equation shows a clear dependence of the former on the latter.

[1]  Xxyyzz.  The Shear Strength of Reinforced Concrete Members , 1973 .

[2]  David Haldane.  Discussion of The Shear Strength of Reinforced Concrete Members by Joint ASCE-ACI Task Committee 426 on Shear and Diagonal Tension of the Committee on Masonry and Reinforced Concrete of the Structural Division, ASCE , 1974 .

[3]  James K. Wight,et al.  STRUT-AND-TIE MODEL FOR DEEP BEAM DESIGN , 2003 .

[4]  Bhupinder Singh,et al.  An appraisal of the ACI strut efficiency factors , 2009 .

[5]  Keun-Hyeok Yang,et al.  Application of plasticity theory to reinforced concrete deep beams: a review , 2008 .

[6]  Kang Hai Tan,et al.  Effect of Web reinforcement on high-strength concrete deep beams , 1997 .

[7]  Sang-Woo Kim,et al.  Composite Strut and Tie Model for Reinforced Concrete Deep Beams , 2009 .

[8]  K. N. Smith,et al.  Shear Strength of Deep Beams , 1982 .

[9]  F. Kong,et al.  WEB REINFORCEMENT EFFECTS ON DEEP BEAMS , 1970 .

[10]  Hiroshi Mutsuyoshi,et al.  Evaluation of Shear Crack Width in I-Shaped Prestressed Reinforced Concrete Beams , 2008 .

[11]  Keun-Hyeok Yang,et al.  Influence of Shear Reinforcement on Reinforced Concrete Continuous Deep Beams , 2007 .

[12]  Shyh-Jiann Hwang,et al.  SHEAR STRENGTH PREDICTION FOR DEEP BEAMS , 2000 .

[13]  James G. MacGregor,et al.  Design Of Reinforced Concrete Deep Beams , 1986 .

[14]  Liang Meng,et al.  Experimental Investigation on Shear Cracking Behavior in Reinforced Concrete Beams with Shear Reinforcement , 2009 .

[15]  Bryan E. Little,et al.  American Association of State Highway and Transportation Officials. Highway Drainage Guidelines American Association of State Highway and Transportation Officials. LRFD Bridge Design Specifications , 2000 .