The purpose of this test report is to substantiate a more cost-competitive alternative to “box beam” and “back-to-back” headers by expanding upon the Lheader testing program that was previously conducted at the NAHB Research Center, Inc. Previous testing of double L-shaped headers indicated that these headers could be a viable alternative to the existing box-beam or back-to-back headers in lightly loaded applications. The higher capacity of the previously tested L-headers was mainly due to the fact that there is an added benefit from the top track that may be neglected in the design process. However, the application of these previous tests were limited to double L-headers. Single L-headers for short openings were tested in this report and span tables were developed for residential building that comply with the applicability limits of the Prescriptive Method for One and Two Family Dwellings. This report starts by providing a literature review of existing tests and/ or design procedures for single L-headers. A list of single L-headers that were tested in this report is then tabulated. Test configuration and test procedures are described. Test results are tabulated and a prescriptive table is developed.
Civil, Architectural and Environmental Engineering
Department of Housing and Urban Development
Steel Framing Alliance
Wei-Wen Yu Center for Cold-Formed Steel Structures
01 Feb 2003
NAHB Research Center, "Testing of steel single l-headers" (2003). CCFSS Library (1939 - present). 52.