| Ordinary RC beam-column joint is the place where the longitudinal bars meet andcross each other, that sometimes make the joint very overcrowded. Furthermore, if thelongitudinal beam bars at the same level and they need to pass through the joint acrosseach other, some of them have to be transformed, which is very difficult when thediameter of the bars are big and make bad effect on the behavior of the component.However, hardly any research has been taken about this common phenomenon up now.In this paper, developed a new RC beam-column joint mode of construction,completed two pseudo-static tests of steel-hoop joint under low reversed cyclic loading,and establish the experimental joint’s models with the general finite element softwareABAQUS. The mechanical properties of specimens, development of the cracks,displacement ductility, energy dissipation capacity, core zone’s bearing capacity andsteel-hoop’s mechanical properties are analyzed. Main conclusions are as follows:①The experiment proved that this joint construction mode can prevent thelongitudinal bars of beam from being crowd in the core zone, to form a lot of voidwhich is very convenient for concrete placement.②The carrying capacity, displacement ductility and energy dissipation capacity ofspecimens increase together with the thickness of steel-hoop panel.③The shear-compression ratio of every specimen is below0.20, that is at themid-level, and the joints are not damaged, both have good carrying capacity.④There is a optimum height of steel-hoop panel. If the panel’s height is less thanthe optimum one, the joint combination won’t reach it’s designed bearing capacity. Onthe contrary, when the height is sufficient, the performance price ratio is low to increasethe height.⑤It is certain that steel-hoop with good mechanical properties can make thebearing capacity and displacement ductility of steel-hoop joint as good as ordinary joint. |
PDF Full Text Request