PSI - Issue 66

Jiaqi Li et al. / Procedia Structural Integrity 66 (2024) 221–228 Author name / Structural Integrity Procedia 00 (2025) 000–000

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plate to avoid buckling of the perforated plate under compression due to weakening, ensuring that the energy dissipation device can yield and dissipate energy under tensile and compressive loads.  Low yield point steel has a lower yield strength and requires more usage than ordinary steel to meet the same bearing capacity requirements. Due to its special connection type, the energy dissipation device itself is not the main load-bearing component, but only deforms together with the beam-column joint under dynamic load to achieve yield energy dissipation, reducing the use of low yield point steel, and lowering the cost.  The energy dissipation device has a simple structure, good overall integrity, low manufacturing cost, easy construction, and broad application prospects.

Fig. 1. Joint construction

Fig. 2. Connection type

3. Numerical simulation 3.1. Geometric construction and material property

In order to study the seismic performance of the energy dissipation joint, numerical simulations are conducted in this paper on the energy dissipation joints and ordinary reinforced concrete joint, the dimensions, reinforcement, and material strength of which are exactly the same except for the energy dissipation device. As shown in Fig. 3, the cross sectional dimensions of the concrete column are 350mm×350mm×1370mm, the diameter of the longitudinal reinforcement is 20mm, the diameter of the hoop reinforcement is 10mm, and the spacing is 76mm; The cross sectional dimensions of the concrete beam are 350mm×405mm×700mm, the diameter of the longitudinal reinforcement is 20mm, the diameter of the hoop reinforcement is 10mm, and the spacing is 50mm; The thickness of the concrete cover is 25mm. The thickness of both the perforated plate and the stiffeners is 10mm, the dowel spacing of the CL composite dowel is 100mm. Other dimensions are taken according to German Technical Approval. The concrete is simulated by concrete damaged plasticity constitutive model, and its material parameters are shown in Table 1. The compression hardening, tensile strengthening and their damage describing the compressive and tensile behavior of concrete in the CDP model are shown in Fig. 4. For reinforced concrete structures under cyclic load, the influence of bond slip behavior between steel bars and concrete on structural performance should be considered, which is the main reason for the "pinching" effect in hysteresis analysis. In this study, indirect simulation method is used to simulate bond slip behavior, and the modified Clough model considering bearing capacity degradation proposed by Su [15] is used to simulate the rebar, as shown in Fig. 5. The hysteresis characteristic of the rebar is described by using the ABAQUS subroutine to define the elastic modulus, yield strength, and hardening stiffness coefficient, with values of 2×10 6 MPa, 446MPa, and 0.001, respectively, in this paper. The material of the energy dissipation device is low yield point steel LYP160, and the material parameters are shown in Table 2. Due to the good hysteresis performance of low yield point steel, its cyclic stiffness degradation is not considered in this paper, and the bilinear constitutive model is used for simulation.