曲线梁的理论研究主要采用平衡法、能量法以及基于变分原理的虚功(位移)方法。

Theoretical studies of curved girders mainly adopted the methods of balanced method, energy method and variation-based method of virtual work (displacement).

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根据日照百分率日变程曲线的变化规律，对于日照百分率大于70%的地区，建议了一种新的日照百分率计算式。

According to the daily change law from curves for percentage insolation, this paper presents a new formula of the average insolation in the zones where the insolation is more than 70%.

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本文根据日照百分率年变程曲线类型，应用聚类分析方法，把全国划分为12个日照区。

By using the method of cluster analysis, the annual variation curve types of the sunshine percentage in China are divided into 12 divisions.

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