ABSTRACT
Current studies concerned with CHS connections focused on ultimate static capacity as their main target. Some work has considered inelastic dynamic behavior in response to extreme wave events, however, it has consisted mostly of high cycle elastic loads to test fatigue behavior. On the other hand, although limited studies have been carried out on seismic performance of CHS unstiffened connections (Kurobane 1998, Soh et al. 2001, Wang & Chen 2007, Chen & Zhao 2007, Yin et al. 2009) and CHS brace to gusset plate connections (Saucedo et al. 2008) under axial loads, there have been no research found on the cyclic behavior of
1 INTRODUCTION
Single-layer reticulated shells have become a particularly popular choice for the large-span roof systems of steel structures because of their light weight, appealing architectural appearance and rapid erection. Circular Hollow Sections (CHS), more commonly used in offshore structures, are a common selection for primary load-carrying members of this type of onshore structure. Box section girders are frequently adopted in the periphery to provide additional stiffness and strength to the single-layer reticulated shell structures subjected to wind or earthquake loading, thus forming CHS stiffened connections to box section girders (CCBG). The distributed load on the CHS members, especially in the event of an earthquake, may generate significant Out-of-Plane Bending (OPB) moments on the X-connections (as highlighted
CCBG under OPB. Because of the lack of test evidences, the seismic detailing of this connection remains unclear and requires further investigation.
