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一、1980年5月的一天上午,西柏林会议厅的一侧屋盖倒塌。当时厅内正在举行一个新闻出版会议。由于建筑物事先有震动的预兆,使大多数人逃出,免遭厄运。该建筑呈卵形平面,马鞍形板壳屋盖,跨度约30米,挑出外墙数米。它从一对支座上伸出两条斜拱,形成受压环。斜拱之间是用悬索支承的薄壳屋面,混凝土厚约6.5厘米。一斜拱和壳板交接处屋面渗水整整23年,悬索严重锈蚀而断裂,
1. One morning in May 1980, the roof of one side of the West Berlin conference hall collapsed. At the time, a press conference was being held in the hall. Due to the harbingers of the building’s prior shaking, most people escaped from their bad luck. The building is an oval flat, saddle-shaped shell and shell roof spans about 30 meters, picking out a few meters of the outer wall. It extends two oblique arches from a pair of bearings to form a pressure ring. Between the oblique arches is a thin shell roof supported by a suspension cable, concrete about 6.5 cm thick. In a 23-year period of water seepage at the junction of an inclined arch and shell plating, the cables are severely rusted and fractured.