PERFORMANCE OF PRECAST CONCRETE CLADDING SYSTEMS UNDER IN-PLANE CYCLIC LOADING

PERFORMANCE OF PRECAST CONCRETE CLADDING SYSTEMS UNDER IN-PLANE CYCLIC LOADING A BAIRD, A PALERMO, S PAMPANIN Department of Civil and Natural Resources Engineering, University of Canterbury SUMMARY In order to investigate the seismic performance of precast concrete cladding an experimental programme has been undertaken by performing in-plane, quasi-static cyclic tests of a moment resisting frame sub-assembly clad with a precast concrete panel. The contribution of the cladding to the strength and stiffness of the frame was monitored along with the performance of the cladding system through increasing drift levels. Various tie-back rod and slotted cladding connections were tested along with innovative dissipative connections to ascertain the effect they had upon the claddings performance and interaction with the frame. INTRODUCTION The performance of precast concrete claddings in earthquakes is invariably mixed. Many systems appeared to have survived the recent Canterbury earthquakes showing only minor cosmetic damage or no damage at all. Other systems show much greater damage with a small number failing completely (Baird et al., 2011). Even when no damage or failure was explicitly visible, later inspection often found that the cladding connections had been damaged to some degree. One inspection revealed that the cladding connections had actually failed and the panels were only still remaining on the structure due to being wedged between the beams of the structure. Shown in Figure 1 are some examples of damage to precast concrete cladding from the 22 nd February 2011 earthquake. Figure 1. Examples of damage to precast concrete cladding and its connections from 22 nd February 2011 earthquake (Baird et al., 2011) Explaining the reason for this difference in performance is critical for three reasons; firstly, to assess the residual capacity of damaged systems; secondly, to identify vulnerable systems that require increased strength, ductility or redundancy and finally, in the design of new cladding systems. In order to better understand the performance of precast concrete cladding systems, an experimental programme has been undertaken at the University of Canterbury using a full- scale test of a precast concrete panel attached to a concrete moment resisting frame. The

PERFORMANCE OF PRECAST CONCRETE CLADDING SYSTEMS UNDER IN-PLANE CYCLIC LOADING

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