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， uc - irvine这项探索性研究（SGER）的小额赠款被要求作为对洛杉矶地区一个全尺寸建筑结构进行的现有现场实验项目的小型扩展。在现场工程中，在模拟地震和其他瞬态荷载情况下，测量了建筑物内许多非结构单元的动力响应。这些实验的载荷是由安装在建筑物屋顶上的质量偏心和直线激振器提供的。在实验中特别感兴趣的是悬浮管道系统的原位动态特性。激振器系统的限制禁止大于约0.3g的输入运动进入结构。在现场测试之后，一些悬挂的管道系统被从建筑物中移除，并收集起来供将来在实验室进行特性测试。为了扩大悬架管道系统动态响应数据的参数空间，本文提出了一个小型的实验室振动台测试程序，以充分利用现有的管道硬件、以前现场实验的仪器和所有相关的安装硬件。此外，从以前在加州大学欧文分校进行的非结构实验中获得的合适的隔膜结构可用于这些实验，只需进行最小的修改。拟议的实验室计划将允许对悬挂管道系统进行全面研究，并考虑到大振幅地震载荷。将以系统的方式调查在现场无法研究的四个方面：(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）差分（与不充液）输入运动和（iv）悬挂系统类型（悬挂、支撑和增强延性）。后期的参数研究将涉及一种简单的延性增强装置的探索性开发，该装置放置在悬架/支撑吊架上，以增加额外的地震耗能能力。这将降低沿管柱的加速度要求，特别是在接头处，过去观察到的大加速度要求导致了弯曲处的断裂。探索的解决方案将是实用的，具有成本效益的性质，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.