提出一种基于MATLAB的圆度评定方法，利用MATLAB优化工具箱，为采用最小区域圆法、最小二乘圆法、最小外接圆法和最大内接圆法实现圆度的评定提供了新的选择。

By using MATLAB optimization toolbox, the method has supplied a new selection to assess roundness with taking MZC, LSC, MCC and MIC as its reference circle.

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薄壁钢扁平箱梁正交异性板钢桥面系第二体系应力的计算方法主要有P - E法、等效格子梁法和有限元法等。

There are mainly three methods in the second system stress analysis of the orthotropic steel deck, P-E method, the equivalent girder beam method and the FEM.

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