SGER: Seismic Performance of Suspended Piping Systems -- From the Field to the Laboratory

摘要：SGER：悬挂管道系统的抗震性能-从现场到实验室，CMS提案0500225 PI：塔拉C。哈钦森，加州大学欧文分校这一小笔探索性研究（SGER）的赠款是作为一个小的扩展，以现有的实地实验项目进行了全面的建筑结构在洛杉矶地区。在现场项目中，在模拟地震和其他瞬态荷载情况下，测量了感兴趣建筑物内一些非结构元件的动态响应。这些实验的载荷由安装在建筑物屋顶上的质量偏心和线性振动器提供。在实验过程中特别感兴趣的是悬挂管道系统的就地动态特性。振动筛系统中的限制禁止大于约0.3g的输入运动进入结构。在现场测试之后，从建筑物中拆除了一些悬挂的管道系统，并收集起来用于实验室的未来特性测试。为了拓宽悬挂管道系统动态响应数据的参数空间，本文提出了一个小型实验室振动台测试程序，以利用该可用的管道硬件、来自先前现场实验的仪器以及所有相关的安装硬件。此外，一个合适的隔膜结构，从以前的非结构实验在加州大学欧文分校进行这些experiments.The拟议的实验室计划将允许在全尺寸的悬挂管道系统的研究，并考虑大振幅地震荷载，与所需的最小修改。将以系统的方式研究无法在现场研究的四个方面：（i）不同的管道布局（直管、45 °弯管和90 °弯管），（ii）充液（和不充液），（iii）输入运动的差异（与不输入运动的差异）和（iv）悬挂系统的类型（悬挂、支撑和延性增强）。后期的参数研究将涉及一个简单的延性增强装置的探索性开发，放置在悬架/支撑吊架，以纳入额外的地震能量耗散能力。这被设想为导致沿管道沿着并且特别是在其接头处的加速度需求降低，在接头处，过去观察到的大的需求已经导致弯曲处的断裂。探索的解决方案将是一个实用的，成本效益的性质，如一个简单的屈服钢构件。

Abstract for: SGER: Seismic Performance of Suspended Piping Systems - from the Field to the Laboratory, CMS proposal 0500225 PI: Tara C. Hutchinson, UC-IrvineThis small grant for exploratory research (SGER) is requested as a small extension to an existing field experiment project conducted on a full-scale building structure in the Los Angeles area. In the field project, the dynamic response of a number of nonstructural elements within the building of interest were measured during simulated seismic and other transient loading cases. Loading for these experiments was provided by mass eccentric and linear shakers mounted on the roof of the building. Of particular interest during the experiments was the in-place dynamic characterization of suspended piping systems. Limitations in the shaker systems prohibited larger than approximately 0.3g input motions into the structure. Subsequent to field testing, a number of suspended piping systems were removed from the building and collected for future characterization tests in the laboratory. To broaden the parameter space of suspended piping system dynamic response data, a small laboratory shake table testing program is proposed herein to capitalize on this available piping hardware, instrumentation from the previous field experiments, and all associated mounting hardware. In addition, a suitable diaphragm structure from previous nonstructural experiments conducted at UC Irvine is available for these experiments, with minimal modifications required.The proposed laboratory program will allow the study of suspended piping systems at full-scale, and considering large amplitude seismic loading. Four aspects will be investigated, that could not be studied in the field, in a systematic fashion: (i) varying piping layouts (straight, 45_bends, and 90_bends), (ii) liquid filled (and not), (iii) differential (versus not) input motions and (iv) type of suspension system (hung, braced, and ductility enhanced). The later parameter investigation will involve the exploratory development of a simple ductility enhancement device, placed at the suspension/brace hanger, to incorporate additional seismic energy dissipation capacity. This is envisioned to result in decreased acceleration demands along the pipe and particularly at its joints, where large demands observed in the past have resulted in fracture at bends. The explored solution will be of a practical, cost-effective nature, such as a simple yielding steelmember.