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天线杆、电灯杆以及烟囱等类的玻璃钢/复合材料管状塔桅结构形式已有出现,本文只就强度计算方面作一些阐述。 这类结构物基本上是下部为支承着的细长圆筒体或截锥筒体,中间或有一道或多道抗风缆索如天线杆常有多道缆索,烟囱有一、二道缆索,广场照明灯杆则由于受条件约束和美观要求,不宜使用缆索,它是固支于地上的悬臂梁。它们所承受的荷载主要是风载,间或在顶部还有其他荷载。 玻璃钢/复合材料与其他惯用材料的不同点之一是其性能具有可设计性,既可以设计成平面准各向同性的材料,也可以设计成一向强度极高而第二向强度几近于零的极度各向异性材料。因此在设计玻璃钢塔桅结构物时,不能象对金属材料一样只从主要荷载设计壁厚,也不能象厚壁钢筋混凝土杆件一样只确定纵向钢筋量,而应在设计好纵向纤维用量的同时,还要设计好周向纤维量。
Antenna rods, lampposts, chimneys, and other types of fiberglass/composite tubular truss structures have emerged. This article will only elaborate on strength calculations. This kind of structure is basically a slender cylindrical or truncated cone body supported on the lower part. There are one or more wind-resistant cables in the middle. For example, there are often multiple cables for a mast, one or two cables for a chimney, and square lighting. The light pole is not suitable for use due to the constraints of conditions and aesthetic requirements. It is a cantilever beam fixed to the ground. Their load is mainly wind load, and there are other loads at the top or at the top. One of the differences between FRP/composite materials and other conventional materials is that their performance can be designed. It can be designed as a plane quasi-isotropic material, or it can be designed with a very high strength in one direction and a near-zero strength in the second direction. Extremely anisotropic material. Therefore, in the design of fiberglass tower truss structures, it is not possible to design the wall thickness from the main load like the metal material, and it is not possible to determine the amount of longitudinal reinforcement like the thick-walled reinforced concrete bar, but it should be designed at the same time as the longitudinal fiber usage. , but also design the amount of circumferential fiber.