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公开(公告)号：US3903667A
公开(公告)日：1975-09-09
申请号：US48798174
申请日：1974-07-12
发明人： ZETLIN LEV
摘要： A structural floor system of precast, prestressed, reinforced concrete beams arranged longitudinally and transversely in a square-grid pattern. Yoke members separate the ends of adjacent beams and longitudinal and transverse tension rods extend through the respective beams and through each of the yoke members for integrally tying the structure together. Each beam comprises a pair of spaced stems defining an axial channel. The yoke member adjacent the end of the beam spans the distance between the stems but leaves uncovered a sufficiently large portion of the open end of the channel to accommodate a duct extending through said open end. Thus, ducts may change direction and/or branch off at any of the yoke locations throughout the structure while remaining within the dimensional height confines of the floor beams.
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公开(公告)号：US3591991A
公开(公告)日：1971-07-13
申请号：US3591991D
申请日：1969-06-17
申请人： LEV ZETLIN
发明人： ZETLIN LEV
摘要： A prefabricatable structural element particularly suitable for use as a cantilevered roof structure capable of spanning large areas and including an elongated curved, preferably hyperbolicparaboloidal, surface member extending between a linear tension member and a linear compression member not sharing a plane common to the tension member. A tensioned flexible member such as a cable connected at one end thereof to a longitudinally spaced portion of the compression member engages the hyperbolicparaboloidal surface member at a plurality of predetermined locations intermediate the said tension and compression members. The tensioned flexible cable member conforms at least partly to the curvature of said surface member and cooperates with the surface member and with the linear tension and compression members so as to provide control over the deflection and flutter characteristics of the structure.
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