Abstract：
In order to provide reliable designing parameters for steel scaffold, anti-slipping tests are carried out on right angle couplers and swivel couplers, including single coupler and parallel-mounted double swivel couplers, with five grades of working tighten-torque on belts of couplers. When tighten torque is below 50 N·m, the anti-slipping load bearing capacity ascends with torque. When the tighten torque is greater that 60N·m, some couplers rapture suddenly. The working tighten-torque of couplers should be 40~50 N·m. At this stage, the load bearing capacity of coupler is at its peak.
