唐山、丰南一带发生的强裂地震,使天津的单层厂房遭到程度不同的破坏。Ⅱ型天窗的钢筋混凝土天窗架破坏比较普遍。轻者开裂,重者倒塌,危害较大。天津工程机械厂的铸铁和金工车间,天窗架倒塌和严重破坏的达百分之六十三;天津拖拉机厂的机修车间,天窗架严重破坏的达百分之六十一。调查的大量震例表明,Ⅱ型钢筋混凝土天窗架 The strong earthquakes in Tangshan and Fengnan caused the destruction of the single-floor factory buildings in Tianjin. The type II sunroof is more common in the destruction of reinforced concrete sunroofs. The lighter ones are cracked, and the heavy ones are collapsed and the damage is greater. Tianjin Casting Machinery Factory’s cast-iron and metalworking workshops, with 63% of the collapse and serious damage of sunroof frames; the repair workshop of the Tianjin Tractor Factory, the sunroof frame was severely damaged by 61%. A large number of earthquake investigations showed that Type II reinforced concrete sunroof