Abstract Embedded Column Base (ECB) connections in seismically resistant steel moment frames are commonly designed to be stronger than the connected column, to protect them from inelastic actions. This relies on estimation of demands induced by the column and the strength capacity of the connections themselves. However, recent research indicates that prevalent approaches may be unconservative for both demand and capacity estimation, with the consequence of unintended damage/failure of the connection. Motivated by the above, this research (1) characterizes the seismic demands induced in ECB connections, and (2) evaluates various strength models for these connections, in support of improved design approaches. This is done through a virtual test program that uses validated continuum finite element simulations of interactive column-ECB subassemblies. The results suggest that the current design approaches for ECB connections are unconservative, i.e., they underestimate demands while also overestimating the ECB resistance, with the possibility of unintentional nonlinear behavior within the embedded portion of the ECB connection. This is undesirable, because the ECB connections are not usually detailed to provide plastic deformation capacity. A method is proposed to provide improved estimates of the anticipated flexural demands of non-dissipative ECB connections, along with recommendations regarding the strength models. To accomplish this, the method incorporates local cross-sectional slenderness, gravity-induced axial load demand in conjunction with load combinations imposed by current seismic design standards. The sensitivity to the steel column material grade, the imposed loading history, and axial load demands is studied, and limitations of the approach are outlined.

中文翻译：

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非耗散预埋柱基连接抗震设计

摘要 抗震钢框架中的嵌入式柱基 (ECB) 连接通常设计为比连接柱更坚固，以保护它们免受非弹性作用。这依赖于估计由柱引起的需求和连接本身的强度能力。然而，最近的研究表明，流行的方法对于需求和容量估计都可能是不保守的，从而导致连接的意外损坏/故障。受上述启发，本研究 (1) 描述了 ECB 连接中引起的抗震需求，以及 (2) 评估这些连接的各种强度模型，以支持改进的设计方法。这是通过一个虚拟测试程序完成的，该程序使用经过验证的交互式柱-ECB 组件的连续有限元模拟。结果表明，ECB 连接的当前设计方法是不保守的，即它们低估了需求，同时也高估了 ECB 电阻，在 ECB 连接的嵌入部分内可能会出现无意的非线性行为。这是不可取的，因为 ECB 连接通常没有详细说明以提供塑性变形能力。提出了一种方法来提供对非耗散 ECB 连接的预期弯曲需求的改进估计，以及有关强度模型的建议。为了实现这一点，该方法结合了局部横截面细长、重力引起的轴向载荷需求以及当前抗震设计标准施加的载荷组合。对钢柱材料等级的敏感性，施加的加载历史，