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.

中文翻译：

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嵌有消能壳板的偏心压缩钢箱桥墩柱的抗震性能

本文提出了一种具有嵌入式可更换耗能壳板的新型钢箱桥墩柱。在垂直偏心和水平循环荷载作用下，对八个具有不同几何和材料特征的独特钢箱墩样品，通过实验研究了这种新型钢桥柱的抗震性能。将实验结果与数值模拟结果进行比较，以验证有限元方法的准确性。扇形加劲肋间距，竖向荷载的偏心率，轴向压缩比，预埋壳体的厚度，细长比和预埋壳体板和箱壁板的材料强度对新型钢箱桥的抗震性能的影响讨论了码头。结果表明，嵌入式消能壳板的安装提高了新型钢桥墩的延性和强度。推荐的扇形加劲肋间距为盒子横截面尺寸的三分之一至一半。如果扇形加劲肋的间距非常小，则嵌入的耗能壳体的变形将受到限制，从而导致试样的断裂位移较小，加速的刚度退化以及变形能力和延展性降低。垂直载荷的偏心导致不对称的骨架曲线。轴向压缩比的减小或埋入式壳体厚度的增加可导致样品更高的极限承载力和更平滑的屈服后滞后曲线，从而提供更好的抗震性能。细长比的增加会降低样品的初始刚度，极限载荷和磁滞回线的包络面积，从而产生较差的抗震性能。箱形壁板或嵌入式壳板中材料强度的增加可以为标本带来更大的最终位移和较小的刚度退化，从而表明这种新型的箱形桥墩具有更高的能耗和抗震性能。