对乌兹别克斯坦混凝土规范中强度概念的解析

Analysis on Strength Concept in Uzbekistan Concrete Codes

在乌兹别克斯坦的海外工程中,需要参考或使用乌兹别克斯坦相关混凝土规范,鉴于中乌两国规范之间存在差异,为了有助于理解乌兹别克斯坦规范中对混凝土的配制强度及强度等级等概念的规定,先从数理上对混凝土强度等级及配制强度的关系进行推导,然后介绍了两国规范对此的相关规定,进行横向对比,并着重对乌兹别克斯坦规范混凝土强度等级及配制强度的关系进行了解析。乌兹别克斯坦认为:乌兹别克斯坦混凝土标准对配制强度的规定本质上也是基于随机变量的正态分布,要求对混凝土强度等级应具有足够的保证率;混凝土配制强度与混凝土强度等级之间的计算公式在形式上与我国不同,但可以通过变换化为一致,其本质是一样的;指出乌兹别克斯坦相关机构对2个概念的理解和执行情况与我国有不同之处,需要引起注意。

During the construction of the overseas projects in Uzbekistan,relevant Uzbekistan concrete codes need to be referred to.However,there is some difference between Uzbekistan concrete codes and Chinese concrete codes.In the paper,the correlation between the concrete strength grade and the concrete preparation strength specified in Uzbekistan concrete codes is deduced mathematically,the regulations on the concrete strength grade and the concrete preparation strength specified in Uzbekistan concrete codes and those specified in Chinese concrete codes are presented and compared,and the correlation between the concrete strength grade and the concrete preparation strength are analyzed. Conclusions drawn are as follows：The specifications on the concrete preparation strength in Uzbekistan concrete codes are actually normal distribution based on random variables,which requires adequate guarantee rate for the concrete strength grade;The form of the conversion formula between the concrete preparation strength and the concrete strength grade provided in Uzbekistan concrete codes is different from that provided in Chinese concrete codes,but they can be converted into the same formula,because they are the same in nature;Relevant Uzbekistan organizations have different understanding on these two concepts from Chinese organizations and they also treat these two concepts differently,to which we should pay more attention.