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This experiment investigates the collapse behaviors and deformation capacity of beam-to-column connections of the steel rigid frames. Eight specimens of connections with box beam and column are tested up to the failure under the condition of monotonic and cyclic loadings. Test results show that the deformation capacity of connections is significantly affected by the elasto-plastic deformation of shear panels and instability caused by local buckling which develops in the beam and column near connection due to bending and torsion. The collapse modes of beam-to-column connections can be classified into three different types i.e., shear, bending and torsion as shown below.

JPEG PICTURES:

1. Built-up of test specimen with box cross-section beam and column by welding[14kB]
2. Specimen before test[26kB]
3. Testing device for beam-to-column connection by 500kN servo actuator[24kB]
4. Shear type collapse with shear buckling of panel zone[24kB]
5. Bending type collapse with flange plate buckling[19kB]
6. Torsion type collapse with torsional buckling of beam or column member[22kB]