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Hybrid testing and modeling of a suspended zipper steel frame

机译：悬挂式拉链钢框架的混合测试和建模

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An analytical and experimental study has been conducted to evaluate the seismic performance of a three-story suspended zipper steel frame. The frame was concentrically braced and had zipper struts to transfer the unbalanced forces induced on the beams due to the buckling of the lower-story braces. The experimental study was conducted with the hybrid test technique, in which only the bottom-story braces of the three-story frame were physically tested, while the behavior of the rest of the frame was modeled using a general structural analysis software. The paper discusses issues pertinent to the calibration of the computer model for the analytical substructure as well as for the entire frame, including the selection of an appropriate damping matrix, and the modeling of the buckling behavior of the braces and bracing connections. The analytical model of the entire frame was validated with the hybrid tests and was able to accurately capture the material and geometric nonlinearities that developed when the braces yielded and buckled. This study has demonstrated the usefulness of hybrid testing in improving analytical models and modeling assumptions and providing information that cannot be obtained from an analytical study alone. The results have shown that the suspended zipper frame can distribute the brace nonlinearity over the first two stories as intended in the design and will not have catastrophic failure under the design-level earthquakes considered in this study, despite the significant inelastic deformations.
机译：已经进行了分析和实验研究，以评估三层悬挂式拉链钢框架的抗震性能。框架同心支撑，并具有拉链撑杆，以传递由于低层支撑屈曲而在梁上引起的不平衡力。使用混合测试技术进行了实验研究，其中仅对三层框架的底层支撑进行了物理测试，而其余框架的行为则使用通用的结构分析软件进行了建模。本文讨论了与分析子结构以及整个框架的计算机模型校准有关的问题，包括选择合适的阻尼矩阵，以及对支撑和支撑连接的屈曲行为进行建模。整个框架的分析模型已通过混合测试进行了验证，并且能够准确地捕获在支撑屈服和弯曲时产生的材料和几何非线性。这项研究证明了混合测试在改善分析模型和建模假设以及提供仅从分析研究中无法获得的信息方面的有用性。结果表明，悬挂式拉链框架可以按照设计中的预期在前两个楼层上分布支撑非线性，并且尽管存在显着的非弹性变形，但在本研究中考虑的设计水平地震下不会发生灾难性破坏。

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