2 . based on the muller - breslau principle , formulars of equivalent nodal loads for the curved - and straight - beam element while occuring unit relative constrained displacement have been deduced . the influence surface of the internal force for grillage has been analyzed by combining kinematic method with finite element static method , using the superposition principle applied to little deformation 根據米勒-布雷斯勞原理,推導了曲梁、直梁截面發生單位強迫相對位移時的等效結點荷載計算公式,運用小變形的疊加原理,將梁格機動分析與梁格有限元靜力分析相結合建立了內力影響面。