Strengthening Method for Precast Concrete Join Structure and Reliability Test After Strengthening

Abstract eng:
In 2012 Indonesia revised its seismic code, previously based on UBC 1997 to be based on ASCE 7-10. This revision indicates that existing building structures do not meet requirements stipulated in the new code. The UBC 1997 code allows intermediate reinforced concrete moment frame (IMRF) to be applied in moderate seismic area, but according to ASCE 710, this is no longer aplicable to sesimic design category D and E. Instead, ASCE 7-10 stipulates the use of special reinforced concrete moment frame (SMRF) for sesimic design category D and E. One strategy that can be adopted to make buidings originally design as IMRF meet the new code is to strengthen the joints by using additional ductile components, such that the structure mimic SMRF behavior. Joint strengthening using steel jacketing has been implemented in some existing precast concrete structural systems in Indonesia, primarily in the period of 2012-2015. Reliability of the buildings strengthened as such, has been commenced by performing tests with respect to gravity loading and tests with respect to lateral stiffness by microtremor testing. The test results demonstrated the success and effectiveness of the strengthening method in improving seismic resistance of existing buildings.

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