Side-face blowout

ACI Committee 318 first approved the inclusion of Appendix D - Anchoring to Concrete in ACI 318/318R-02. It provided strength design requirements for anchorage to concrete that consider several potential failure modes such as steel strength, concrete breakout, anchor puUout, side-face blowout, and anchor pryout (shear) in accordance with the CCD Method. ACI 318-08 includes the following important enhancements to Appendix D ... 

Local concrete side-face blowout (lateral bursting) failure is caused by the quasi-hydrostatic pressure in the region of the anchor head (Eligehausen et al., 2006). 

When reinforcement is used to restrain side-face blowout and improve ductility related to side-face blowout, it should have suffieient strength and stiflhess in the direction of the lateral force causing the side-face blowout. 

IF TIES CENTERED AT THE BEARING SURFACE OF THE ANCHOR HEAD ARE INSUFFICIENT TO RESIST THE SIDE-FACE BLOWOUT FORCE, PLACE ADDITIONAL TIES WITHIN THIS REGION. 

Figure 3.9 Spiral Reinforcement at Anchor Head to Improve Side-face Blowout...

Chsckths side-face blowout resistance of anchor In tension (D.MI... 

Because of symmetry, only side-face blowout resistance on one face of the pedestal needs to be considered. 

Strength reduction factor for anchor governed by side-face blowout, assuming condition A (supplementary reinforcement Is provided to tie the failure prism) (f = 0.75 (D.4.4.(c))... 

RESULTANT OF TWE RADIAL HORIZONTAL COMPONENT OF DIAGONAL CONCRETE STRUTS, WHICH IS ASSUMED TO BE SIMILAR TO SIDE-FACE BLOWOUT FORCE, F... 

Fcor factor to modify the side-face blowout near a comer... 

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