LONG-TERM MONITORING OF PRE-STRESS INTRODUCED TO THE EXTERIOR SUPPLEMENTAL STEEL BRACE FOR SEISMIC RETROFIT

Abstract

There is a great demand to the exterior supplemental steel brace for seismic retrofit, in order to complete the construction work while the building space is in service. The pre-stress is used as an installation method of steel braces, and the authorized design guideline is available. The reliability of this seismic retrofit method strongly depends on the existence of the pre-stressing force. There was an opportunity to adopt an exterior supplemental steel brace and the pre-stressing force was monitored in site for more than nine years. The reliability of this seismic retrofit scheme was confirmed.