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60年代初期,美国在加州兴建一批中小学校舍采用了预应力混凝土技术。从1955年到1980年共建2000幢预制应力混凝土梁的房子,发现有小问题的24幢,有大问题而要封禁或临时顶撑的共8幢,严重的有屋顶坍塌,调查的结果发现是由于预应力混凝土梁蠕变造成的。预应力况凝土梁的蠕变比普通混凝土大,必须在设计和施工中采取措施。1、设计上采取在梁端翼板及两侧的架立钢筋巾增加钢筋网,这样对钢材增加了抗
In the early 1960s, the United States to build a number of primary and secondary school buildings in California using prestressed concrete technology. From 1955 to 1980, a total of 2,000 prefabricated concrete beams were built, 24 were found to have minor problems, 8 were major problems and were blocked or temporarily supported. There was a serious roof collapse and the investigation revealed that Is due to the creep of prestressed concrete beams. Prestressed concrete beams creep creep than ordinary concrete, must take measures in the design and construction. 1, designed to take in the beam end of the wing panels and both sides of the erection of reinforced steel mesh reinforcement, so that the steel increased resistance