Abstract
Steel reinforced concrete special-shaped column structural has all priorities of steel reinforced structure and special-shaped column structure. The design of steel reinforced concrete special-shaped column joints is of great importance to ensure that this new structural can be widely used in earthquake area. This research adopted the new joint design style, and the pseudo-static test is carried out on three joints (JD-1, JD-2 and JD-3) between the steel reinforced concrete special-shaped column and the reinforced concrete beam, and one joint (JD-4) between reinforced concrete special-shaped column and concrete beam. The working mechanism of joints and the function of steel in the shearing-resistant mechanism are analyzed. Based on the results of experimental research, this article put forward formulas on the cracking capacity and shearing resistant capacity of these joints with theoretical and applicative purposes. Take into account all these facts, the behavior of high resistant capacity and reliability of the joint design method has been manifested. Some conclusions derived from this research can be used as a reference for engineering practice.
Highlights
Comparing steel reinforced concrete (SRC) and normal RC, the Steel reinforced concrete (SRC) column structure has more advantages due to its high strength (Chen et al, 2020; He et al, 2019) and shear capacity (Xu et al, 2019; Jiang and Bai, 2020; Zhao, 2020)
The truss mechanism is applicable when the core zone is equipped with both horizontal stirrups and dense vertical reinforcement and when the joints are subjected to a large shear force, and a plurality of cracks are generated in the core area under repeated loading
The SRC was prepared in the core area of the joint, and there were few longitudinal steel bars in the special-shaped column
Summary
Comparing steel reinforced concrete (SRC) and normal RC, the SRC column structure has more advantages due to its high strength (Chen et al, 2020; He et al, 2019) and shear capacity (Xu et al, 2019; Jiang and Bai, 2020; Zhao, 2020). The pseudo-static test was carried out on three joints between the SRCSS column and the RC beam specimens JD-1, JD-2, and JD-3, and one joint between the RC special-shaped column and the specimen JD-4 Their performances under bidirectional low-cyclic reversed loading were compared. Applicable when the core zone is equipped with both horizontal stirrups and dense vertical reinforcement and when the joints are subjected to a large shear force, and a plurality of cracks are generated in the core area under repeated loading. The effect of the diagonal concrete struts was reduced, and most of the shear forces could be assumed by an imaginary truss mechanism In this test, the SRC was prepared in the core area of the joint, and there were few longitudinal steel bars in the special-shaped column. Where cs is the shear strain of section steel in the core area, cc is the shear strain of concrete in the core area, cso is the shear strain of the steel tube in the core area, and cco is the shear strain of concrete in the core area of the steel tube
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