观音岩水电站缆机基础排架三维有限元结构计算

The 3-D Finite Element Structure Calculation of the Foundation Framed Bend for the Cable Cranes for Construction of the Guanyinyan Hydropower Project

观音岩水电站采用辐射式缆机进行坝体及厂房混凝土浇筑,其左岸缆机基础跨冲沟布置,为弥补地形缺陷及减少混凝土量,跨冲沟段采用排架式结构,最大高度29.5m,最大跨度70m。由于该结构为三维空间结构,无法简化成平面模型,结合缆机副车轮压分为垂向和水平向的荷载特点,须采用三维模型进行结构计算,以分析结构的位移及应力水平,并对高应力区进行配筋计算。目前,该结构已经过各项检验,运行良好。

The radial cable cranes were employed to perform concrete placement of both dam body and powerhouse for the Guanyinyan hydropower project, and the foundation for the cable cranes on the left bank was arranged crossing a gully. In order to remedy the topographical defects and to reduce the concrete quantity the framed bend structure with max. height of 29. 5m and max. span of 70m was adopted for the gully section. As the structure is a three--dimensional space structure it can not be simplified to be a plane model, it is necessary to use 3--D model to make structure calculation according to the characteristics of the cable crane side wheel pressure being composed of vertical and horizontal loads, thus both displacement and stress level of the structure could be analyzed and reinforcement calculation for the high stress area could be performed. At the present time the structure has undergone various tests and proved good in operation.