Modified Stub‐Girder Floor System: Full‐Scale Tests

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Abstract
This paper summarizes the results of load tests on two full‐size stub‐girders. The first, specimen M‐1, had a conventional girder‐to‐column connection and the second, specimen M‐2, featured a modified connection in which an extended end stub was connected to the column support. The modified end details offer some economic advantages, greater convenience for the erection and for installation of services. The test specimens were designed as spandrel stub girders for a typical office floor loading and consisted of three continuous spans. The concrete slab was continuous over the end supports of the interior span. The test results indicated that the stub girder with the modified end details is structurally as efficient as the conventional system. Specimen M‐1 failed by shear yielding of the steel girder, while specimen M‐2 failed by crushing of the concrete slab. The measured ultimate loads were 1.58 and 1.81 times the design factored load for specimens M‐1 and M‐2, respectively. Specimen M‐2, with the modified girder‐to‐column connection, exhibited a 14% increase in the observed ultimate strength over specimen M‐1.

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