Open channel sections manufactured from high-strength
steel (HSS) were tested. The sections were bent about the
axis of symmetry of the cross sections. The roll formed
test profiles, one U, two C and one hat cross section
with yield stresses of 565 - 655 N/mm2 and material
thicknesses of 4 6 mm were taken from normal
production. Also one point symmetric Z profile of lower
grade steel was included in the test series.
Tests were made for bending and eccentric compression.
Bending tests for short and long beams (12 tests) were
made to determine the cross sectional properties and
lateral buckling resistance of the beams respectively.
The eccentric compression tests (12 tests) studied the
interaction between compression and bending resistance.
The test results together with other test results from
literature are compared with the design resistance
determined according to the proposed design method. The
simplified method is a combination of the Eurocode
3/Annex A and AISI 1989 codes. The elastic buckling
stresses are calculated using the full, unreduced
dimensions, while actual section strength is determined
with the effective dimensions. The method is satisfactory
for normal design, although in some cases it is found to
be too conservative.
Comparison with the other test results confirmed that the
accuracy of the design rules do not depend on the yield
strength or wall thickness. Some non linear FEM analyses
indicated the feasibility also in this loading case.
|Place of Publication||Espoo|
|Publisher||VTT Technical Research Centre of Finland|
|Number of pages||82|
|Publication status||Published - 1993|
|MoE publication type||Not Eligible|
|Series||VTT Tiedotteita - Meddelanden - Research Notes|
- steel structures
- steel construction
- high strength steels
- structural steels
- cold working
- bending properties
- bending stress
- compression tests
- cross sections
- beams (supports)