Notes:

f_{cu} represents the compressive strength of the cubic concrete specimen. Considering the different conversion relationship between f_{cu} and f_{c} in reference [^{14}]and [^{5}],the calculations of f_{c} should refer to the corresponding reference.

When formula (7) is used to the calculate the specimens that filled with different strength of concrete, the calculation formula of f_{c}can be expressed as: f_{c}=(A_{c}_{1}f_{c}_{1}+A_{c}_{2}f_{c}_{2}) / (A_{c}_{1}+A_{c}_{2}).

, , respectively represents the value of the ultimate bearing capacity obtained by experiment, the value of the ultimate bearing capacity calculated by formulas, the ration of and . The rest parameters are the same as the preceding part of the text.
