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In this study, the strength of welds connecting steel plate and steelcoupler is investigated. A total of 88 specimens, including partial penetration groove welds with single-J bevel and fillet welds, using #10 steel coupler are tested. Test results show that:(1) AWS prequalified partial penetration groove welds with single-J bevel is suitable for assemblage of couplers and steel. (2) The formula suggested in chapter 4 gives a good estimation of the weld strength of partial penetration groove welds with single-J bevel couplers, (3) In the practical range, the thickness combination of box column plate and diaphragm does not influence the strength of welds. (4) Eccentricity, between coupler and diaphragm, smaller than 7 mm, does not decrease the strength of welds.
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