The baseplate upright connections of the steel storage racks are often attached to the concrete floor by anchor bolts possibly at an eccentric location. Currently available rack design specifications do not provide any guidelines to take account of the influence of eccentric anchor bolt location and do not consider the associated baseplate behavior in the design of such storage rack base connections. The first part of this paper experimentally established the flexural behavior of the baseplate upright connections with eccentric anchor bolts. The experiments considered an enhanced test setup and five groups of three nominally identical test specimens. Influencing parameters such as the baseplate thickness, anchor bolt size, the bracket thickness and the upright thickness were studied. The experimental observations revealed that the baseplate eccentric anchor bolt assembly plays a dominant role on the flexural behavior of the entire baseplate upright connections. The rotational stiffness, the failure mode and the moment capacity of the base connections are strongly intertwined with the eccentric anchor bolt location as well as the baseplate bending behavior. In order to further understand the behavior of such connections, in the second part of the paper, a component-based analytical model is established to predict the initial rotational stiffness and the progressive post yielding rotational stiffnesses of the baseplate upright connections. The moment capacity of the connections is also determined using a deformation limit-based method. The analytical model gives only a 3% underestimation of the initial stiffness and a 3% overestimation of the moment capacity compared with experimental results. The proposed model is suggested to be incorporated in future rack design specifications so that the model can be used by the rack designers to analytically determine the behavior parameters of the eccentric anchor bolted baseplate connections. The rack designers can also use the proposed model to identify the deformation contribution of each individual component and to develop a multi-linear moment-rotation relation of the baseplate upright connections without resorting to the physical experimental tests. Parametric studies were also performed using the proposed analytical model and the influence of relevant parameters had been quantified. Doubling of the baseplate thickness may result in a 11–37% increase in the initial rotational stiffness of the considered baseplate upright connections.

钢制储物架的底板直立连接通常通过地脚螺栓固定在混凝土地板上。当前可用的机架设计规范未提供任何准则来考虑偏心地脚螺栓位置的影响，并且在此类存储机架基座连接的设计中未考虑相关的底板性能。本文的第一部分通过实验建立了带有偏心地脚螺栓的基板直立连接的挠曲特性。实验考虑了增强的测试设置和五组三个名义上相同的测试样本。研究了诸如底板厚度，地脚螺栓尺寸，支架厚度和直立厚度等影响参数。实验观察表明，底板偏心地脚螺栓组件在整个底板直立连接的挠曲行为中起主要作用。基础连接件的旋转刚度，破坏模式和弯矩能力与偏心地脚螺栓的位置以及底板的弯曲性能密切相关。为了进一步了解此类连接的行为，在本文的第二部分中，建立了基于组件的分析模型，以预测底板直立连接的初始旋转刚度和逐渐屈服后的旋转刚度。连接的力矩能力也可以使用基于变形极限的方法来确定。与实验结果相比，分析模型仅给出了3％的初始刚度低估和3％的弯矩承载力高估。建议将建议的模型合并到将来的机架设计规范中，以便机架设计人员可以使用该模型来分析确定偏心锚定螺栓连接的底板连接的行为参数。机架设计人员还可以使用提出的模型来识别每个单独组件的变形贡献，并开发底板直立连接的多线性力矩-旋转关系，而无需进行物理实验测试。还使用建议的分析模型进行了参数研究，并且已量化了相关参数的影响。