Experimental study on mechanical anchoring performance of 630MPa heat treated ribbed high-strength steel bar
In order to study the mechanical anchoring performance of 630MPa heat treated ribbed high-strength steel bar,two groups of 60 specimens were subjected to pull-out tests,which were in the form of single side bonding anchorage and the end plug bonding anchor plate.The influence of concrete tensile strength,anchorage length,reinforcement diameter,thickness of concrete cover and stirrup ratio on mechanical anchoring performance under different anchoring conditions was studied.The results show that the mechanical anchoring specimens with 630MPa heat treated ribbed high-strength steel bar have three failure modes,namely concrete splitting,steel pulling out and steel yielding.The specimens of end plug bonding anchor plate has better anti-slip effect.The mechanical anchoring strength of specimens increases with the increase of concrete tensile strength,thickness of concrete cover and stirrup ratio.It decreases with the increase of anchoring length and reinforcement diameter.Based on the experimental results,a formula for calculating mechanical anchoring strength of 630MPa heat treated ribbed high-strength steel bar was established.The results show that the calculated values of the formula are in good agreement with the experimental values.
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