正梁，是指架在屋架或山墙上面最高的一根横木。
它把一个连续斜梁桥的力学问题转化为连续正梁桥的力学问题。
It transformed the mechanic problem from the continuous skew beam bridge into the continuous straight beam bridge.
本文采用内聚力模型作标准来判别各种基于梁弯曲理论的方法，这些方法包括简单梁理论、修正梁理论和实验柔度法。
CZM is used as a benchmark to check the precision and applicability of beam-bending method, such as SBT (Simple Beam Theory), CBT (Corrected Beam Theory) and ECM (Experimental Compliance Method).
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