我国砖混结构住宅量大面广,防止砖混结构住宅大震倒塌的问题,是一个值得探讨的问题。地震实践证明,四层及四层以下砖混结构住宅在7度区,一般不致于倒塌,高于四层,或在大于7度区,这类结构抗倒塌能力就差了。唐山震害表明,虽然砖混结构倒塌率很高,但也确有一些砖混房屋裂而未倒。 China has a large number of brick-concrete-structured houses and it is a question worthy of discussion to prevent the collapse of large earthquakes in brick-concrete structures. Earthquake practice has proved that in the 7-degree zone, the four-story and four-story brick-concrete-structured dwellings are generally not collapsed. They are higher than the four floors, or in more than 7 degrees, and the collapse resistance of such structures is poor. The earthquake damage in Tangshan shows that although the collapse rate of the brick-concrete structure is high, some brick-concrete buildings have indeed been cracked and not collapsed.