GB440799A - Improvements in a steel floor construction - Google Patents

Abstract

440,799. Floors. WYLIE, A. R., 634, Hinman Avenue, Evanston, Illinois, U.S.A. April 3, 1934, No. 10099. [Class 20 (iv)] A structural steel floor comprises a plurality of rows of columns A, main girders 10, 11 supported in spaced relation from the columns and arranged in pairs as shown in Fig. 1, one on each side of each row of columns, and transverse beams 23, 24 connected between the main girders 10, 11. Transverse girders 12, 13, which are arranged in pairs, one on each side of each transverse row of columns, are connected with the girders 10, 11 at the points of intersection. The girders 10, 11, 12, 13, which are preferably I-beams, are formed in sections, such as 10<a>, 10<b>, 10<c>, connected together so as to provide continuity throughout the length of each girder. The sections of the girders 10, 11 are shown in Fig. 1 as extending for the length of two column spacings, and are secured together by plates B, arranged above and below the sections, and by angle members arranged on the webs of the sections. The girders 12, 13 are formed of sections such as 12<a>, 12b, 12<c>, 12<d> which are connected between the girders 10, 11 by the plates B and by plates C. The main longitudinal and transverse girders are adapted to divide the floor structure into a number of panels, such as that bounded by the sections 11<b>, 15<b>, 10<c>, 13<c>, each of which is of less area than the area formed by the rectangle bounded by four adjacent columns, and these panels are subdivided by the beams 23, 24. The sections of cross girders 15, 16, which are similar to the girders 12, 13 are connected together by plates C. The plates B secure together the meeting ends of four girder sections, and the plates C tie two cross girders 12, 13, 15, 16 where they stop on opposite sides of a girder section 10, 11. The girder sections 10<b>, 11<b> may extend 'for the distance between successive columns or for a multiple of this distance. The girder system is connected to the columns by brackets 17, 18 which are secured to the girder sections 12b, 13b by means of angle members 19 as shown in Fig. 5, the brackets 17, 18 being secured to the columns by angle members 20. In the modification shown' in Fig. 6, the sections of both the longitudinal and transverse girders 110, 111, 112, 113 are of a length equal to the column spacing, and are connected by plates C<1>. The wall columns A<2>, A<3>, Fig. 6, are connected by side girders 119, 120. In the modification shown in Fig. 9, each girder section 210, 211, 212, 213 is of a length equal to the column spacing, and the girders are equally spaced to form panels D, E, F ... and are connected by plates C<2>. The girder section 211, extends between two girders 212, and each of the panels is about one-fourth the area between four adjacent columns. All the beams and girders are of substantially the same depth throughout so that the resulting ceiling is flat. The steel structure is adapted to support a flooring of tiles or concrete, which may be cast in situ in the panels.