Seismic Behavior of the Joints of Rectangular Steel Tubular Columns Filled with Steel-Reinforced Concrete and H-Shaped Steel Beam in Different Beam Strengths

Abstract

In this paper, the finite element analysis software ABAQUS is used to study the seismic performance of the joints of rectangular steel tubular columns filled with steel-reinforced concrete and H-shaped steel beam in different beam strengths, which are under the same axial compression ratio of 0.2. By the finite element simulation, we can get the load-displacement curves and skeleton curves from the end of H-shaped steel beam. According to the curves and dates, the seismic performance of the joints is analyzed. The shape of each restoring force curves presents for full square spindle, reflecting that the beam-column structure can effectively absorb the seismic energy; with the enhancement of H-shaped steel beam’s strength, the ultimate bearing capacity of the structure is gradually increasing, however, the stiffness and overall stability of the components become worse by degrees; the change of ductility property about the joints is not obvious, showing good seismic performance.

[Retracted] Study on Seismic Performance of Recycled Steel Fibers Locally Reinforced Cruciform Concrete Frame Beam‐Column Joint

“…e stiffness degradation of specimen SJ-4 was slower than that of SJ-2 and SJ-3. erefore, the increase of recycled steel fiber content does not significantly improve the bearing capacity of specimens [19] but has a relatively obvious improvement in the ductility and the delay of stiffness degradation of specimens [20]. (3) Specimen SJ-2 and specimen SJ-5 are used as comparison specimens; it can be seen that the bearing capacity and stiffness degradation capacity of specimen SJ-2 are slightly stronger than that of specimen SJ-5, and specimen SJ-2 has fewer cracks than specimen SJ-5, indicating that recycled steel fibers can improve the seismic performance of joint specimens better than normal steel fibers.…”

“…where α f is the influence coefficient of steel fibers on tensile strength of concrete matrix, combining with the test [30], taking α f � 0.53; f t is the tensile strength of concrete matrix; f ft is the tensile strength of recycled steel fiber-reinforced concrete, and its expression is shown in formula (19).…”

“…where ρ f is the volume content of steel fibers; l f /d f is the length-diameter ratio of steel fibers. Substitute formula (19) into formula (18) to obtain…”