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随着建筑向装配化方向发展,尤其是受到用地的限制,层次与高度亦逐渐增加,装配化多层建筑整根予制柱的长度亦逐步增长。为了减少由于吊装过程中增加的钢筋,因此由一点吊发展为二点、三点吊,但柱子在吊装过程中的弯矩一般是按照连续梁计算,这种计算方法有时与实际弯矩相差很大。某工程30米长的柱子采取三点吊,按照连续梁计算,但在吊装过程中发生空中突然折断事故,应该引起有关设计、教学、施工单位的重视,为此将连续梁与
With the development of the building towards assembly, especially due to the limited land use, the levels and heights have also been gradually increasing. The length of the prefabricated prefabricated columns of the assembled multi-storey buildings has also gradually increased. In order to reduce the increase of steel reinforcement during hoisting process, it is developed from one-point crane to two-point and three-point crane. However, the bending moment of the column during hoisting is usually calculated according to a continuous beam, which is sometimes different from the actual bending moment Big. A 30-meter-long column of a project takes three-point crane and is calculated according to a continuous beam. However, when a sudden break in the air occurs during the hoisting process, attention should be paid to the design, teaching and construction units. Therefore,