Steel rocking column bases with replaceable cover plates: Cyclic loading behaviour and practical design
Steel rocking column bases with replaceable cover plates: Cyclic loading behaviour and practical design
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DOI：
10.1016/j.engstruct.2022.114467
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发表时间：
2022-08
影响因子：
5.5
通讯作者：
Yan-Wen Li;Y. Koetaka
中科院分区：
文献类型：
--
作者：
Yan-Wen Li;Y. Koetaka
这项研究提出了一种钢摇柱底座，通过一对可更换的钢盖板来消散地震能量。设计了所提出的钢柱底座的三个样本，并在静态循环荷载下进行了测试。获得并讨论了柱底座的滞回响应、失效模式和能量耗散。然后建立了柱基的三维有限元模型并根据测试结果进行了验证。随后，采用分量法来预测柱底座的旋转刚度和承载力。采用屈服线理论预测了盖板的极限承载力和锚杆的轴向抗力需求。结果表明，所提出的柱基能够通过盖板的塑性弯曲来消散地震能量。抗弯矩能力随着盖板屈服强度、厚度和轴压比的增大而增大，其中轴压比影响最显着。所提出的设计方程可以以可接受的精度预测柱底座的旋转刚度和柱底座的极限承载力。此外，还提出了柱端的加固方法，以促进所提出的柱底座的实际设计。
This study proposed a steel rocking column base that dissipates seismic energy through a pair of replaceable steel cover plates. Three specimens of the proposed steel column base were designed and tested under static cyclic loading. Hysteretic response, failure modes, and energy dissipation of the column base were obtained and discussed. Then three-dimensional finite element model of the column base was built and validated against the test results. Later on, a component method was employed to predict the rotational stiffness and capacity of the column base. The Yield Line Theory was employed to predict the ultimate capacity of the cover plates and the demand of axial resistance of anchoring rods. It shows that the proposed column base is capable of dissipating seismic energy through the plastic bending of the cover plates. The moment resisting capacity increased with the increasing yield strength and thickness of cover plates and axial compression ratio, wherein the axial compression ratio has the most significant effect. The proposed design equations can predict the rotational stiffness of the column base and ultimate capacity of the column base with acceptable accuracy. Moreover, stiffening approaches for the column end were also presented to facilitate the practical design of the proposed column base.