universal beams amp columns channels ub beam beamclamp 250 ub26 steel south auckland north h 250x125x29 6 jis g 3192 arbed solved question 3 beam shear stress ub gb t 11263 2017 cross section revit structure learning curve january roll lifting beam h 250x125x29 6 jis g 3192 arbed h 250x125x29 6 jis g 3192 arbed ub gb t 11263 2017 cross section 250 ub column dimensions fast delivery