Flexural strength of cold-formed steel panels using high-strength, low-ductility steel

摘要

Ninety-three cold-formed deck panel specimens were tested using the Structural Grade 80 of ASTM A653 steel (formerly ASTM A446 Grade E steel) to evaluate the flexural strength of the deck panels and their performance as affected by high-strength and low-ductility of the steel. The panels were tested in both two-point and one-point loading conditions. The test results indicated that for the panel specimens with small wit ratios, the tested yield moments were reached and are compared reasonably well with the calculated effective yield moments. However, for the panel specimens with large wit ratios, the tested ultimate moments are lower than the calculated effective yield moments, but much larger than the calculated moments using the specified value of 60 ksi (414 MPa). A modified yield strength reduction factor was developed for the design of flexural strength of members with yield strength exceeding 80 ksi (552 MPa).