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Sang ki Jang,Sung Gul Hong 대한건축학회 2004 Architectural research Vol.6 No.2
In this study, the strut-and-tie model for the coupling beam with plastic hinges is presented. The ultimate rotation of the coupling beams is obtained by using the geometric relationship between walls and coupling beams at ultimate state. Assuming the required plastic deformation at both ends of the coupling beam, the strut-and-tie model is constructed. To design earthquake-resistant shear-dominated RC coupling beams, it is important to consider shear strength deterioration with required ductility. This research proposes the method of estimating shear strength of the reinforced concrete coupling beams considering the strength degradation of the diagonally compressed concrete due to the strain in plastic hinges. The proposed method determines the plastic strain from required plastic deformations based on the elastic deformation of coupling beams and ultimate wall deformations. The estimated horizontal strain of beam is then used in calculating the strength of the diagonal strut of arch action with compatibility conditions. The deterioration of shear strength of the coupling beam depends on the decrease of arch action due to plastic deformations.
Deformation-based Strut-and-Tie Model for reinforced concrete columns subject to lateral loading
Hong, Sung-Gul,Lee, Soo-Gon,Hong, Seongwon,Kang, Thomas H.K. Techno-Press 2016 Computers and Concrete, An International Journal Vol.17 No.2
This paper presents a Strut-and-Tie Model for reinforced concrete (RC) columns subject to lateral loading. The proposed model is based on the loading path for the post-yield state, and the geometries of struts and tie are determined by the stress field of post-yield state. The analysis procedure of the Strut-and-Tie Model is that 1) the shear force and displacement at the initial yield state are calculated and 2) the relationship between the additional shear force and the deformation is determined by modifying the geometry of the longitudinal strut until the ultimate limit state. To validate the developed model, the ultimate strength and associated deformation obtained by experimental results are compared with the values predicted by the model. Good agreements between the proposed model and the experimental data are observed.