预应力混凝土技术可以节省大量钢材,60年代初开始流行,当时在加州(为适应二次大战后出生的儿童)兴建的一批中小学校舍采用了这个技术。20年后,一所中学的礼堂屋顶坍塌,调查的结果发现是由于蠕变。预应力混凝土的蠕变比普通混凝土大,在设计施工中必须采取特殊的措施。中国在现代化建设中正在推广预应力混凝土技术,希望能从本文中吸取经验教训。 Prestressed concrete technology can save a lot of steel and became popular in the early 1960s, when a group of primary and secondary school buildings was built in California (to accommodate children born after World War II). Twenty years later, the roof of a high school auditorium collapsed and the results of the survey were found to be due to creep. Prestressed concrete creep than ordinary concrete, in the design and construction must take special measures. China is promoting prestressed concrete technology in its modernization drive and hopes to draw lessons from this article.