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Prestress Of Steel Frame Oct 26, 2017

The mechanical properties of cable-supported large-span portal frames are similar to that of general prestressed structures. The rigid frame beam, the force state of the column reduces the internal force peak of the external load and the deflection of the rigid frame beam, so that the internal force and deformation of the prestressed rigid frame are decreased greatly, and the bearing capacity of the rigid frame is increased and the stiffness of the structure is increased. It is not difficult to see that the force of the three-stage load is the loading-unloading-reloading process of the cable-bearing rigid frame from the three stages of the bending moment of the beam-column joints and the beams.Steel Frame

The prestressing effect is more obvious than traditional prestressed portal frame, it is not difficult to see from the rigid frame that the steel cable is not only the tensile force to the top of the column, but also the uplift of the rigid frame with the traditional prestressed structure compared with the pole. The upward force can counteract a large part of the vertical external load, so after the prestressed cable support portal frame is subjected to external load, the Liang final bending moment decreases or even the inverse number. The internal forces of prestressed cables and rods vary with the application of external loads, and the internal forces of cables and rods are significantly increased under the action of vertical loads, which play a significant role in the whole rigid frame.Steel Frame

Compared with the traditional prestressed portal frame structure, the tensile cable with larger structural stiffness not only exerts prestress on the structure, but also becomes the chord rod of the rigid frame beam, which has more structural rigidity than the traditional method of chord the prestressed cable with the rigid frame beam. In addition, under the action of vertical load, the bracing rod and steel cable of the cable support rigid frame have the function of elastic support to the rigid frame beam and the column respectively, which enhances the stiffness of the rigid frame especially the beam.Steel Frame