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本文利用支座升降来调整正交交叉平板网架结构的内力,使中部桁架的最大内力降低,边区桁架的内力值升高,使每个方向或两向同部位处构件的内力相等,从而减少节点类型、统一构件、节省材料,在安装过程中容易同步提升。 当交叉结构为四角点支承时,只要将边跨主要支承结构的刚度与跨中次要结构的刚度比值或对应各杆的截面面积比值按各自所承受的荷载的比值取值,在加载过程中,整个结构体系就会自行调整其内力,可获得同样的经济效果。文中附有实例。
In this paper, the internal force of the orthogonal cross-plane grid structure is adjusted by the support lifting and lowering, so that the maximum internal force of the central truss is reduced, and the internal force value of the edge truss is increased, so that the internal forces of the components at the same position in each direction or two directions are equal, thereby reducing Node types, unified components, and material savings can be easily enhanced in the installation process. When the cross structure is a four-corner point support, the ratio of the stiffness of the side-span primary support structure to that of the minor secondary structure or the ratio of the cross-sectional areas of the respective rods is taken as the ratio of the respective loads to which they are subjected, during the loading process. The entire structural system will adjust its internal forces and achieve the same economic results. Examples are attached here.