Experimental Study on Seismic Behavior of Precast Bolt-Connected Steel-Members End-Embedded Concrete (PBSEC) Beam-Column Connections
Abstract
:1. Introduction
- The structure is simple, and the force path is clear. Changing the thickness of the connecting steel plate can realize the controllable stiffness of the joint to optimize the structure’s seismic performance and repair the performance after structural damage by replacing the connecting steel plate;
- The damage to the structure is controllable. When the structure is subjected to an earthquake, the connecting steel plates of the joints resist the bending moment caused by the earthquake, while the beams and columns are still in an elastic state. When the connecting steel plate yields, the stiffness of the joint changes from semi-rigid characteristics to zero, which can be regarded as a hinge, the structure is in the ideal state of the hinged beam end, and the seismic capacity and collapse resistance of the structure is improved;
- There is no wet operation in the assembly process, and the all-dry construction method is adopted. The beams and columns are assembled with high-strength bolts during construction. There is no need to pour concrete and support formwork throughout the process, significantly improving construction efficiency.
2. Design of the Test Specimens
3. Processing of the Test Specimens
3.1. Manufacturing Process
3.2. Material Properties
4. Test Loading and Measurement Scheme
4.1. Test Loading Device
4.2. Test Procedure and Measurements
5. Analysis of the Test Results
5.1. Observations and Failure Modes
5.2. Strain–Displacement Curves
5.3. Hysteresis and Skeleton Curves
5.4. Evaluation of the Performance Indicators
5.4.1. Average Peak Load
5.4.2. Strength Degradation Ratio
5.4.3. Energy Dissipation Indicators
6. Conclusions
- (1)
- Component construction: This structure has a simple form and a clear force path. The material properties of the connecting steel plates are changed to optimize the seismic performance of the joints, and the performance repair after structural damage can be achieved by replacing the connecting steel plates. There is no wet work in the assembly process, and all-dry construction and assembly methods are used. During construction, only the beams and columns need to be assembled by high-strength bolts. There is no need to pour concrete and support formwork, which significantly improves construction efficiency, reflecting the convenience and efficiency of dry connection construction;
- (2)
- Failure mode: This paper observes and analyzes the failure mode of the PBSEC joints, the buckling failure of the connecting steel plate, which is the ideal failure mode. When the structure is subjected to earthquake action, the connecting steel plate of the joint resists the bending moment brought by the earthquake action, resulting in damage while the beam and column are still in an elastic state. When the connecting steel plate of the joint yields further and buckles, the stiffness of the joint changes from the semi-rigid feature to zero, which can be regarded as a hinge. The structure is in the ideal state when the beam end is hinged, and the seismic capacity and collapse resistance of the structure is obtained;
- (3)
- Seismic performance: The hysteresis curves of the PBSEC joints do not have slip characteristics. They are bow-shaped and full in shape, showing high energy dissipation capacity. The bearing capacity of the joints begins to rise rapidly at the initial loading stage and then decreases slowly after reaching the peak, which is an ideal shape. By summarizing the average peak load, strength degradation coefficient, loop energy per cycle, loop energy per level, cumulative energy and equivalent viscous damping coefficient, it is found that the energy dissipation capacity of joint J1-235-10 is better than other joints, reflecting its excellent energy dissipation performance, indicating that the joint using 10 mm thick Q235 steel can obtain the most suitable failure mode and obtain the best energy dissipation performance. When the strength of the steel plate material increases, the energy dissipation performance of the joint drops.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Specimen No. | Steel Strength | Steel Section/mm | Test Parameters |
---|---|---|---|
J1-235-10 | Q235 | 280 × 110 × 10 | Control group |
J2-160-10 | LY160 | 280 × 110 × 10 | Decrease the strength |
J3-345-10 | Q345 | 280 × 110 × 10 | Increase the strength |
J4-390-10 | Q390 | 280 × 110 × 10 | Increase the strength |
Grade | Diameter (mm) | fy (MPa) | fu (MPa) | Es (Gpa) |
---|---|---|---|---|
HRB500 | 10 | 552 | 756 | 201 |
HRB500 | 28 | 548 | 750 | 208 |
Grade | f7d (MPa) | f28d (Mpa) | fc (MPa) | Ec (Gpa) |
---|---|---|---|---|
C50 | 39.5 | 50.7 | 37.9 | 30.5 |
Grade | fy (MPa) | εy | fu (MPa) | εu |
---|---|---|---|---|
LY160 | 178.3 | 0.01959 | 316.4 | 0.26549 |
Q235 | 311.4 | 0.02069 | 408.9 | 0.18001 |
Q345 | 408.0 | 0.02173 | 562.3 | 0.17039 |
Q390 | 429.0 | 0.02043 | 549.0 | 0.16590 |
Specimens | Directions | Py (kN) | Δy (mm) | Pm (kN) | Δm (mm) | Δu (mm) |
---|---|---|---|---|---|---|
J1-235-10 | positive | 81.36 | 32.71 | 94.00 | 53.80 | 81.94 |
negative | −72.84 | −23.57 | −83.00 | −43.25 | −72.71 | |
J2-160-10 | positive | 61.69 | 59.86 | 68.05 | 128.00 | N/A |
negative | −50.45 | −51.38 | −59.78 | −105.20 | N/A | |
J3-345-10 | positive | 115.55 | 68.83 | 126.56 | 99.00 | 119.69 |
negative | −106.67 | −52.09 | −121.79 | −73.45 | −120.39 | |
J4-390-10 | positive | 120.39 | 72.05 | 130.70 | 95.50 | N/A |
negative | −113.99 | −52.24 | −127.52 | −74.17 | N/A |
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Wang, Z.; Feng, D.-C.; Wu, G. Experimental Study on Seismic Behavior of Precast Bolt-Connected Steel-Members End-Embedded Concrete (PBSEC) Beam-Column Connections. Buildings 2022, 12, 1652. https://doi.org/10.3390/buildings12101652
Wang Z, Feng D-C, Wu G. Experimental Study on Seismic Behavior of Precast Bolt-Connected Steel-Members End-Embedded Concrete (PBSEC) Beam-Column Connections. Buildings. 2022; 12(10):1652. https://doi.org/10.3390/buildings12101652
Chicago/Turabian StyleWang, Zhun, De-Cheng Feng, and Gang Wu. 2022. "Experimental Study on Seismic Behavior of Precast Bolt-Connected Steel-Members End-Embedded Concrete (PBSEC) Beam-Column Connections" Buildings 12, no. 10: 1652. https://doi.org/10.3390/buildings12101652