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82年7月前后,上海地区大雨、暴雨,持续多天;使不少旧式房屋的瓦片(主要是中瓦)含水率达到了饱和,屋面荷载明显增加,造成一些桁条断裂。但是,大雨暴雨只是促使桁条断裂的外部原因,实际上构件内部早己存在潜在危险。木结构构件的潜在危险是由多种原因引起的,有天然的缺陷,也有人为的因素,有的还可能同时存在于同一构件中。由于这种潜在危险的发展,使构件逐渐丧失承载能力,最后导致突然破坏。上海静安区从1981年8月到
Around July of the year of July 82, heavy rains and heavy rains in Shanghai lasted for many days; the water content of many old-style houses (mainly Zhongwa) reached saturation, and the roof load increased significantly, causing some purlins to break. However, heavy rain is only an external cause of the breakage of the purlin, and in fact, there is already a potential danger inside the component. The potential hazards of wood structural components are caused by a variety of causes, including natural defects, human factors, and some of the same components. Due to the development of this potential danger, the components gradually lost their bearing capacity and eventually caused sudden damage. Shanghai Jing’an District from August 1981 to