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一、概述当预加力作用在静定的简支梁或单悬臂体系上,在结构内部引起弯矩M=-N_ye,结构本身产生“自由”的变形,如图1a所示。在静定结构中钢束重心线与预加力压力线吻合,不产生次反力,故不引起结构内力的变化。但在连续梁超静定结构中,由于预加力产生的变形受多余支承条件的约束而不能“自由”变形,只能产生如图1b所示的变形状态。
I. Overview When the preloading force acts on a static simply supported beam or a single cantilever system, the bending moment M = -N_ye is generated inside the structure, and the structure itself produces “free” deformation, as shown in FIG. 1a. In statically determinate structure, the centerline of steel beam coincides with pre-stressing pressure line, no secondary reaction force is generated, so it does not cause the change of internal force of structure. However, in the continuous beam statically indeterminate structure, the deformation caused by the pre-energizing force can not be “deformed” freely due to the constraint of the remaining supporting conditions, and only the deformed state as shown in FIG. 1b can be generated.