Cyclic Load Protocol for Anchored Nonstructural Components and Systems

Abstract

This work is motivated by the need to investigate the cyclic load response of restrained (via anchorage or other) nonstructural components and systems (NCSs). For this purpose, a load protocol is developed for capturing the behavior of the restraining element when subjected to seismic loading. The protocol incorporates numerical analyses of buildings designed to respond nonlinearly under design earthquake events, analysis of secondary systems located in these buildings and rainflow counting of time history results extracted from these analyses. Secondary system response results are used to develop tension and shear load protocols. Protocol statistics are presented and envisioned to be useful in anchor or other restraint system qualification tests.

Development and validation of European guidelines for seismic qualification of post-installed anchors

“…Therefore the obtained tension and shear loading protocol developed for nonstructural components are conservative (higher cycle count) for anchors used in structural anchorage applications. Additional details about the load protocol can be found in [45]. In what follows, we expand on the details of the numerical investigation and ensuing data processing steps articulated in Figure 1.…”

“…Subsequently, the hazard deaggregation is used to guide the selection of ground motion records. Details on the suite of 21 selected motions obtained from the Pacific Earthquake Engineering Research Center Next Generation of Ground-Motion Attenuation Models (PEER-NGA) strong motion database [52], and their subsequent scaling to the design acceleration spectrum over a range of periods, can be found in [45]. We note however that the magnitudes and distance pairs of the selected ground motions represent 94 % of the deaggregated contributions with ground motions of a peak ground acceleration above 0.51 g.…”

Behavior of Post-Installed Anchors Tested by Stepwise Increasing Cyclic Load Protocols

“…Load controlled cyclic load protocols: a) Cyclic tension tests; b) Cyclic shear tests (after Hutchinson and Wood 25 ).…”

“…The stepwise-increasing load cycling protocols developed at the University of California, San Diego (UCSD) 25 for example reflect an effort to lay the foundation for improved investigations of seismically loaded anchors. To further characterize seismic performance of post-installed anchors and to support the development of qualification tests representing the loading conditions relevant for seismic applications, an extensive research program was carried out at the Institut für Werkstoffe im Bauwesen, Universität Stuttgart (IWB).…”

Performance of Suspended Nonstructural Components and Their Anchorage during Shake Table Tests

“…The earthquake motions for these analyses were selected from the PEER database (2010) and scaled using the geometric mean method to a specified design spectrum covering the fundamental periods of interests. Detailed information regarding the selected ground motions, methodology and scaling procedures is given in Hutchinson and Wood (2013) and Wood and Hutchinson (2013). Building periods for the five building types are given in Table 1.…”