Flexure Capacity of Compression Chord
Two joist thicknesses were considered in this study, 0.046 in and 0.035 in. Table 1 summarizes the mechanical properties of the sheet steels used to fabricate the joists. To preclude failure of the
Fig. 5. Typical clinch failure.
Table 3. Flexure test results.
compression web, as occurred in the clinch study, the web was reinforced or embossed as shown by Figure 3. Clinches were of type “R” spaced three inches on center.
A total of six tests were performed in this study as summarized in Table 3. Figure 6 shows a typical joist failure. The tested capacity, wtest, was compared with the computed capacity, wcomp, where the computed capacity was based on the AISI specification (North, 2001). On the average, the flexure capacity of the joist was achieved for both thicknesses of joist. Also, the tests verified that the joist behavior is best modeled as a beam and not a truss.