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：Tara C. Hutchinson，加州大学欧文分校 这项小额探索性研究资助 (SGER) 是对洛杉矶地区在全尺寸建筑结构上进行的现有现场实验项目的小型扩展。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许多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台提供。实验期间特别令人感兴趣的是悬挂管道系统的就地动态特性。振动台系统的限制禁止大于约 0.3g 的输入运动进入结构。现场测试后，许多悬挂管道系统被从建筑物中拆除并收集起来，用于实验室未来的特性测试。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，以利用可用的管道硬件、先前现场实验的仪器以及所有相关的安装硬件。此外，加州大学欧文分校之前进行的非结构实验中的合适隔膜结构可用于这些实验，只需进行最小程度的修改。拟议的实验室计划将允许对悬挂管道系统进行全尺寸研究，并考虑大幅地震载荷。将研究无法以系统方式在现场研究的四个方面：(i) 不同的管道布局（直管、45 弯和 90 弯）、(ii) 充满液体（和不充满液体）、(iii) 差分（与非）输入运动和 (iv) 悬架系统类型（悬挂、支撑和延展性增强）。后期的参数研究将涉及探索性开发一个简单的延展性增强装置，放置在悬架/支撑吊架上，以纳入额外的地震能量耗散能力。预计这将导致管道沿线的加速需求减少，特别是在其接头处，过去观察到的大量需求已导致弯曲处断裂。所探索的解决方案将具有实用性、成本效益的性质，例如简单的屈服钢构件。

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.