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扭壳屋盖是一种空间结构,与一般平面体系屋盖相比,可采用较大的柱网,建筑面积使用灵活,而且可以有效地利用建筑净空。扭壳的曲面是由平行于周边的直线两端各沿脊线和周边移动构成的(图1),曲面标高容易控制,可采用直模板和配置直钢筋,因而施工较其它壳体简便。扭壳屋盖在建筑音响方面也比其它壳体优越,不必专作声学处理。由于具有这些特点,扭壳已成为当代建筑中常用的壳型之一。大连海港仓库的双跨连续四块组合型扭壳屋盖建于1971年。仓库建筑总长191.7米,宽46.7米,建筑面积8,950米~2。其屋盖由16个四块组合型扭壳组成。每个扭壳的平面尺寸为23×23米,矢高3.834米,壳厚6厘米;边缘构件为跨度23米的人字形拉杆拱。壳面及边拱
Twisted shell roof is a kind of spatial structure. Compared with general flat roof, it can use larger column nets, flexible construction area, and can effectively use building clearance. The twisted shell’s curved surface is formed by moving both ends of the straight line parallel to the periphery along the ridgeline and the periphery (Fig. 1). The elevation of the curved surface can be easily controlled. The straight formwork and the straight steel bar can be used. Therefore, the construction is simpler than other shells. Twisted shell roofs are also superior to other housings in building acoustics and do not require special acoustics. Due to these characteristics, twisted shells have become one of the most commonly used shell types in contemporary architecture. The double-span, four-piece twisted shell roof of Dalian Harbour Warehouse was built in 1971. The warehouse building has a total length of 191.7 meters, a width of 46.7 meters, and a building area of 8,950 meters~2. Its roof consists of 16 four twisted shells. Each twisted shell has a plane size of 23 x 23 meters, a height of 3.834 meters, and a shell thickness of 6 centimeters; the edge member is a herringbone rod arch with a span of 23 meters. Shell face and side arch