Abstract
A novel steel-box bridge-pier column with embedded replaceable energy-dissipating shell plates is proposed herein. The seismic performance of this new steel bridge column was investigated experimentally on eight unique steel-box pier samples with varying geometric and material features under vertical eccentric and horizontal cyclic loads. The experimental results were compared with numerical simulation results to validate the accuracy of the finite element method. The effects of fan-shaped stiffener spacing, eccentricity of vertical loading, ratio of axial compression, thickness of embedded shell, ratio of slenderness, and material strength of embedded shell plates and box wall plates on the seismic behaviour of the new steel-box bridge-piers are discussed. Results showed that installation of embedded energy-dissipating shell plates improved the ductility and strength capacity of the new type of steel bridge piers. The recommended fan-shaped stiffener spacing was one-third to half of the box cross-sectional dimension. If the spacing of the fan-shaped stiffeners is extremely small, the deformation of the embedded energy-consuming shells will be limited, resulting in a small fracture displacement of the specimen, accelerated stiffness degradation, and reduced deformation capacity and ductility. The eccentricity of the vertical loading results in asymmetrical skeleton curves. The decrease in axial compression ratio or the increase in embedded shell thickness can lead to a higher ultimate capacity and smoother post-yield hysteretic curve for the specimens, thereby affording better seismic performances. The increase in slenderness ratio can engender a reduced initial stiffness, ultimate load, and envelope area of the hysteresis loop for the specimen, thereby yielding a worse seismic performance. The increase in material strength in the box wall plates or embedded shell plates can yield a larger ultimate displacement and smaller stiffness degradation for the specimen, thereby suggesting an enhanced energy-consumption capacity and improved seismic performance for this new type of box bridge pier.
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Abbreviations
- N :
-
Eccentrically axial compressed load
- f y :
-
Yield strength of steel wall plate
- DS :
-
Spacing of fan-shaped stiffeners on embedded energy-consuming shells
- δ ye :
-
Lateral deformation on top of the specimen corresponding to nominal yield point
- θ y :
-
Deformation angle related to nominal yield point
- δ u :
-
Lateral deformation on top of the specimen related to the extreme point
- λ j :
-
Strength degradation coefficient
- e :
-
Eccentricity of axial load N
- P :
-
Lateral cyclic load
- σ y :
-
Yield strength of embedded shell plate
- δ :
-
Cyclic horizontal displacement
- μ :
-
Displacement ductility coefficient
- δ max :
-
Horizontal displacement at the top of the column corresponding to the peak point
- n :
-
Axial compression ratio
- θ max :
-
Displacement angle corresponding to the peak point
- θ u :
-
Displacement angle corresponding to the extreme point
- K j :
-
Secant stiffness
- h e :
-
Equivalent viscous damping coefficient
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Acknowledgements
This research work was supported by National Natural Science Foundation of China (No. 51778248), Natural Science Foundation of Fujian Province (No. 2018J01075), Promotion Program for Young and Middle-aged Teacher in Science and Technology Research of Huaqiao University (No. ZQN-PY312), and Research Trained Fund for Outstanding Young Researcher in Higher Education Institutions of Fujian Province. Besides, the first author would like to appreciate the China Scholarship Council for sponsoring the visiting at the University of New South Wales under the Grant No. (201807540009). The tests were completed in Key Laboratory for Structural Engineering and Disaster Prevention of Fujian Province. The support provided by the laboratory staff is gratefully acknowledged.
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Li, H., Lv, K. & Cui, R. Seismic behaviour of eccentrically compressed steel-box bridge-pier columns with embedded energy-dissipating shell plates. Bull Earthquake Eng 18, 3401–3432 (2020). https://doi.org/10.1007/s10518-020-00830-2
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DOI: https://doi.org/10.1007/s10518-020-00830-2