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

摘要：SGER：悬挂管道系统的地震性能-从现场到实验室，CMS提案0500225 PI：Tara C.Hutchinson，加州大学欧文分校这笔小额探索性研究拨款(SGER)是对洛杉矶地区现有的现场实验项目的小型扩展，该项目对洛杉矶地区的一个全尺寸建筑结构进行了研究。在现场项目中，在模拟地震和其他瞬时荷载的情况下，测量了感兴趣的建筑内的一些非结构构件的动力响应。这些试验的载荷是由安装在建筑物屋顶上的质量偏心和线性振动器提供的。在实验期间，特别感兴趣的是悬浮管道系统的就地动态表征。振动筛系统的限制禁止向结构中输入大于约0.3g的运动。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，以便将来在实验室进行特性测试。为了扩大悬空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，以利用现有的管道硬件、以前现场试验的仪器以及所有相关的安装硬件。此外，加州大学欧文分校以前进行的非结构实验中的合适的横隔板结构可用于这些实验，只需最小的修改。拟议的实验室计划将允许在全尺寸和考虑大幅度地震荷载的情况下研究悬挂管道系统。将研究四个不能在现场系统研究的方面：(I)不同的管道布局(直管、45弯和90弯)，(Ii)充液(和不充液)，(Iii)不同的输入运动和(Iv)悬挂系统的类型(悬挂、支撑和延展性增强)。后面的参数调查将包括探索性地开发一种简单的延性增强装置，放置在悬挂/支撑吊杆上，以纳入额外的地震能量耗散能力。这预计将导致管道沿线的加速需求减少，特别是在其连接处，过去观察到的大需求会导致弯头处断裂。探索的解决方案将是一种实用的、具有成本效益的解决方案，例如一种简单的屈服钢构件。

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.