Developing seismic design guidelines for pallet racks

存储架系统广泛用于仓库建筑物中的存储设施。本研究针对ARPAC公司生产的选择性托盘储存钢货架（SPSSR）进行设计。目前，在地震区设计这种结构还没有适当的指导方针。拟议的研究将通过实验研究机架结构的梁柱连接、支撑柱连接和底板柱连接的专有结构部件的行为，以及跨过道和过道方向的框架响应，并制定SPSSR的抗震设计指南。将对回弹试验和反向循环荷载试验进行评估，以确定各种连接的自然周期、刚度、荷载-位移响应、滞后阻尼和性能，这对于建立能够准确预测SPSSR响应的有限元模型至关重要。性能-基础设计正在成为抗震设计和结构评估的标准实践，以实现可靠和满意的性能水平。加拿大对SPSSR的抗震性能研究很少。本研究将探讨SPSSR系统不同组件之间的相互作用下增加的横向载荷，并评估各种损伤状态，失效机制，其崩溃行为。这将有助于确定适当的截面尺寸和连接细节。所开发的数值模型将首先与实验结果进行验证。然后利用该模型对不同结构的SPSSR的响应进行仿真。将按照FEMA P-695程序进行增量动态分析（IDA），以制定基于力的设计程序的力修正系数。IDA的结果也将被用来观察在不同的位移水平的损伤机制，提出基于位移的设计程序。这项研究将提供基于性能的设计解决方案的机架结构及其元素。这项研究的重要性是至关重要的，因为它直接有助于加拿大机架基础设施的安全和保障。

Storage rack systems are widely used for storage facilities in warehouse buildings. The proposed research deals with the design of Selective Pallet Storage Steel Racks (SPSSRs) manufactured by ARPAC. Currently, there are no proper guidelines for designing such structures in seismic regions. The proposed research will experimentally investigate the behavior of proprietary structural components of beam-to-column connections, brace-to-column connections, and baseplates-to-column connections of rack structures and the frame response in both cross-aisle and down-aisle directions and develop seismic design guidelines for SPSSRs. Snapback test, and reversed cyclic loading tests will be evaluated to determine the natural period, stiffness, load-displacement response, hysteretic damping, and behavior of various connections, which will be critical to establishing finite element models that can accurately predict the response of SPSSRs.Performance-based design is becoming a standard practice for seismic design and evaluation of structures to achieve a reliable and satisfactory level of performance. There has been little study on the seismic performance of SPSSRs in Canada. This study will examine the interaction among different components of the SPSSR systems under increased lateral loads and evaluate various damage states, failure mechanisms, and its collapse behavior. This will help determine adequate section sizes and connection details. The developed numerical models will be first validated with experimental results. Then the models will be utilized to simulate the response of SPSSRs with various configurations. Incremental dynamic analyses (IDA) will be performed as per FEMA P-695 procedure to develop force modification factors for force-based design procedure. The IDA results will be also utilized to observe the damage mechanism at various displacement levels to come up with the displacement-based design procedure. This study will provide performance-based design solutions for rack structures and their elements. The significance of this research is paramount as it directly contributes to the safety and security of Canadian rack infrastructure.