此值被用来比较材料的强度，但是当设计计算时，要用一个安全系数，使工作应力低于比例限制。
This value is used to compare the strength of materials, but a safety factor is applied when making design calculations, to bring the working stress well below the limit of proportionality.
刚完工的半刚性基层材料不能达到设计龄期时的强度，以致于半刚性基层顶面施工弯沉检验值不能按设计龄期的强度计算。
Semi-rigid base can't reach the designed strength just after its finished, so the checking value of construction deflection can't be calculated by designed age strength.
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