中美规范钢筋和混凝土强度换算

CONVERSION OF STRENGTH FOR STEEL BAR AND CONCRETE BETWEEN CHINESE AND AMERICAN CODES

中国和美国的结构设计规范在计算方法、材料强度取值和保证率、试件尺寸形状以及构造要求不同,最后导致两者的计算结果有很大差异。要比较混凝土构件采用这两种规范计算的结果,必须先将相同的材料按各规范试验方法和取值方法进行换算。通过ACI 318M—11《美国房屋建筑混凝土结构规范及条文说明》与GB 50010—2010《混凝土结构设计规范》的基本假定和从材料强度保证率出发,分析比较两本规范在设计参数取值上的不同,推导出中国常用的钢筋和混凝土按美国规范取值强度指标的换算关系。最后换算出常用钢筋和混凝土按美国规范取值的强度指标。

The differences between Chinese and American codes for structural design lie in calculation methods, the design values and assurance factor of material strength,and the shapes,sizes and construction requirements of samples,and these result in great differences between the calculation results. To compare the results of concrete member calculated with Chinese code with those of American codes,the same material must be converted according to the test method and value-taking method of each code. Based on the basic assumptions and material strength assurance of GB 50010—2010 Code for Design of Concrete Structures( Chinese code)and ACI 318 M-11( American code),the differences between these two codes in design parameters are analyzed, the calculation formula of design parameters of steel bar and concrete commonly used in China according to the Americancode are deduced,and the strength index of steel bar and concrete commonly used in China according to the American code are calculated.