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A total of 137 ultimate strength tests on simple T, Y, DT, and K tubular joints is used as a basis for development of new ultimate capacity formulas. The data are taken from a variety of sources and only relatively large geometries are considered. Axial tension, axial compression, in-plane bending, and outof-plane bending loads are represented. The failure condition is taken as the minimum of either maximum load, first crack load, or load at an excessive deformation limit.Several formulas are recommended to predict the capacity of the different joint and load types. The accuracy of these formulas is then studied in a statistical manner. Predictions of past and present API RP 2A formulas are compared to the same data base. It is found that the new equations are more consistent in their level of prediction and result in less scatter. The new equations are also relatively simple in format. This paper does not suggest how to incorporate the new equations into design practice. The safety factor and other issues such as load interaction (10, 22) should be addressed prior to design use. PRELIMINARY CONSIDERATIONS Data Base ValidityComparisons of joint capacity test results with the predictions of existing capacity equations generally show extensive scater (10, 11). There are a number of likely sources of the scatter. First, many of the tests were conducted on very small joints; the chord diameters were less than 75 mm (3 in.). With small models it is difficult to properly scale the weld and local behavior, particularly where fracture is involved. Second, for many tests the 113 14. Novikov, V., et al., "Oirect Joining of Tubular 25.

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