The paper presents the impact tensile behaviors of two common building membranes (Ferrari 1002T2 membrane and XYD 300N membrane) in PVDF-coated-fabric membrane structures. The tests are conducted using the split Hopkinson bar test device. Typical forms of stress and strain are applied for comparing the stress-strain relationship between quasi-static and high strain rates. Besides, the failure mechanism and energy absorption at high strain rates are discussed. The results show that with the increase of strain rates, the growth rate of the stress of PVDF membrane decreases gradually, which is different from the stress-strain relationship in low strain rates. At high strain rates, the ultimate tensile strength increases linearly with the increase of strain rates. In addition, the energy absorption capacity of the material increases with the increase of strain rates. The results can provide an important basis for the design and analysis of membrane structures under the impact loads.
In recent years, some scholars suggested that the beam-end of beam-column joint of steel frame can be reinforced by fiber reinforced plastics (FRP) and filled with concrete. In this paper, the reversed cyclic behavior of this new kind of plastic hinge outward joint were studied by finite element analysis. The numerical study shows that, the plastic hinge can be successfully moved outside by reinforced beam-end as reinforced by FRP at the beam end and pouring concrete in the cavity. According to the parameter analysis, it can be found that, as the length of the FRP and the length of the concrete increased, the load carrying capacity and the initial stiffness of the joint increases, but the energy performance of the joint decreases slightly. The thickness of the FRP, paste FRP vertically or horizontally has slightly influence on the cyclic behavior of bolted beam-column joint with FRP reinforced at beam-end.
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