Improved detailing of precast concrete panel to foundation connections to withstand out-of-plane earthquake loads

Abstract

Concerns have previously been raised regarding the seismic performance of slender precast panel to foundation connections, in particular the apparent lack of a viable load path when the connection is subjected to an out-of-plane opening moment. Previous testing in 2014 showed that current New Zealand standard practice regarding the use of threaded inserts in precast panels led to less than optimal performance when subjected to out-of-plane loading. To address the concerns raised during these tests, a second series of tests has been planned to investigate the out-of-plane response of modified panel to foundation connection details, including threaded insert details and details using conventional cast-in reinforcement starter bars. Details of the 16 planned experimental tests are described followed by preliminary results from the two panels tested to date.