Experimental Research On The Effects Of Load-Bearing Performance About SRHC Beam-to-Column Interior Joint With Different Stirrup Ratios

Steel reinforced high strength concrete structure (SRHC) is a kind of composite structure which insert steel (S) in reinforced high strength concrete(RHC); Steel reinforced high strength concrete structure (SRHC) is the product of the combination of steel and high strength concrete, and it is a new way of the development of modern steel structure and concrete structure. Joint is the pivot of beam-to-column load transfer in frames, the weak link of frame, and the key position of bonding beam and column. The load of beam and column is transferred by the joint, so the safe reliability of the performance of joint is the premise to ensure normal work of the structure. If the joint is destroyed, no matter how strong the beam and column are, the structure is destined to fail even collapse. Therefore, enough attention should be paid to the design of the joint in high-rise frames, which must meet the design principle of strong-column and weak-beam and stronger-joint. However, there are still comparatively few researches on load-bearing performance of Steel reinforced high strength concrete beam-to-column joint in the present. The design of steel concrete in two industry standards called Specification for Design of steel reinforced concrete structures(YB9082-97) and Technical specification for steel reinforced concrete composite structures for steel concrete combined structures(JGJ138-2001)only involve concrete of C60. No further specification is provided on the steel concrete joint design with higher strength concrete. Therefore, to enhance the research on steel reinforced high strength concrete and to fill the space and shortage have much significance and practical value to spread its application in engineering.By conducting tests of 3 steel reinforced high strength concrete beam-to-column interior joint with concrete strength varies from 72.5MPa to 76.5MPa under low cyclic reversed loading, this paper mainly study the failure patterns, hysteretic curves, skeleton curves, ductile coefficients, energy dissipation, strength degeneration, deformation constituting rule and shearing performance of steel reinforced high strength concrete beams and columns under different core section stirrup ratios in the joint. Preliminary discussion is also made about the bonding stress distribution between steel and high strength concrete in the joint section.