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Title: Investigation of Mechanical Splices for Titanium Alloy Bars

Author(s): Mahesh Acharya

Publication: Web Session

Volume: ws_S22_MaheshAcharya1.pdf

Issue:

Appears on pages(s):

Keywords:

DOI:

Date: 3/28/2022

Abstract:
There has been a lack of mechanical splicing systems for pseudo-threaded Titanium Alloy Bars (TiABs). Mechanical splicing is a preferred method of joining conventional rebars instead of lap splicing. There are many types of mechanical splicing systems available for conventional and high-strength steels. In this research, experimental work is carried out to identify some of these commercially available mechanical splicing systems for splicing of TiABs. Mechanical splices from a producer in the United States are considered for this research. Three different types of mechanical couplers are investigated for splicing of #5 and #6 pseudo-threaded TiABs. The reason behind selecting #5 and #6 TiABs is that they are preferred instead of larger bars. TiABs that are larger in diameters are more expensive and harder to bend. Tensile testing is carried out on a number of #5 and #6 spliced TiABs in accordance with ASTM A1034 to investigate suitability of each splicing system. Observations from testing showed that only one type of splicing system was able to achieve failure of TiABs at a location away from the spliced region. The other two splicing systems encountered premature pullout or failure of the coupler itself. Testing results suggest that the successful coupler/splicing system was in close compliance with the requirements of AASHTO LRFD that require mechanical splices to achieve more than 125% of the yield strength of the bar. Given the lower strain hardening of TiABs (1.1) compared to conventional steel (1.5), the coupler system identified in this research is concluded to be adequate for mechanical splicing of #5 and #6 TiABs subjected to monotonic tensile stresses.