1962 年 11 巻 111 号 p. 790-796
Recently, a new typedlift-slab construction method with prestressed concrete girders has been devised by Mr. T. Okamoto.
An interesting aspect of this method is the prestressing of the connection of column to slabs and, as this result, we may obtain a higher rigid connection of column to slabs than that of flatslab typed-one.
Some static bending tests were carried out to obtain the fundamental data on the prestressing, rigidity, strength and so on of the connection of column to slabs using some tests specimens with various sectioned-prestressed concrete girders and variously prestressed connection of column to two girders.
As the tests results, the following aspects were obtained:
(1) Observed was the tendency that F, the coefficient of shear friction, becomes smaller as the prestressing force of the connection of column to two girders get larger.
But, in any test specimen, the value of F was larger than 0.45.
(2) Consequently, adopting 0.4 as the value of F and prestressing the connection of column to two girders with the prestressing force correspondent to the value of F, we can obtain the rigid connection of column to slabs.