Calculation method of shear capacity of UHPC beams based on experimental database
To study the calculation method of shear capacity of reinforced UHPC beams,firstly,a shear test database of reinforced UHPC beams was collected and established.Secondly,the formulas of shear capacity in French NF P18-710 code,Swiss SIA 2052 guideline,Japanese JSCE—2006 guideline,GB 50010-2010,JGJ/T 465-2019 and DBJ 43/T 325-2017 were evaluated and analyzed.Finally,the modified formulas based on French NF P18-710 code were proposed.The result shows that the formula in the listed codes all conservatively predicts the shear capacity of reinforced UHPC beams.Among them,the ξm of UHPC beams without shear reinforcement is 1.71-2.71,and the ξm of UHPC beams with shear reinforcement is 1.52-2.09.Among the foreign specifications,the ξm of French NF P18-710 code is 1.52-1.71,with the smallest error in the predicted results and a more reasonable safety reserve.Compared with the prediction results of French NF P18-710 code,the ξm of Swiss SIA 2052 guideline is 1.70-1.95,and the prediction results are more conservative.The prediction results of Japanese JSCE—2006 guideline for UHPC beams without shear reinforcement are closer to those of French NF P18-710 code,whereas the prediction results for beams with shear reinforcement shows a large deviation.Among the domestic specifications,the prediction results of GB 50010-2010 are the most conservative,with ξm ranging from 2.13 to 2.71.JGJ/T 465-2019 and the DBJ 43/T 325-2017 consider the effect of steel fibers on the shear capacity based on the GB 50010-2010,and their prediction accuracies are improved.Among them,the ξm of JGJ/T 465-2019 is 1.59-1.74,and the ξm of DBJ 43/T 325-2017 is 1.66-1.81.Based on the error analysis of calculation models in codes,methods for determining the coefficients of UHPC matrix considering the influence of shear span ratio and coefficients of steel fibers considering the influence of steel fibers are proposed.The calculation formula of shear capacity in French NF P18-710 code is modified,which can better predict the shear capacity of reinforced UHPC beams.
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