Experimental Study on Seismic Behavior of Y-shaped Steel Tubular With In-filled Concrete Column

In ordete inspect the anti-seismic performance of the columns in underground large space subuay station, the authors studied on a pseudo-static test for Y-shaped concrete-filled steel tubular column (CSTC) , which was used for underground space structure in a Beijing subway station equipment public area. The design, production, installation of the CSTC and test program, the process and results of the test were mainly introduced, and the authors gave the horizontal force-axial displacement hysteresis curve, skeleton curve, equivalent stiffness, equivalent damping ratio curve and the load- strain curve of the main location. The results and analysis of experiment show that Y-shaped cast steel component, round tubular column and top plate and other parts have a stable and reliable connection, which can ensure good work performance of the overall structure; Hysteresis loop of the specimens are full, and the equivalent viscous damping ratio of Y-shaped CSTC increases with the increase of the horizontal displacement, the energy consumption is stable, and specimen has very good elastic-plastic deformationcapacity and seismic performance. Through the measured strain, it is inferred that the weak parts probably are the bottom of the steel tubular column, the joint of the Y-shaped cast steel component and round tubular column, Y-shaped cast steel node bifurcation.