EXPERIMENTAL STUDY ON STABILITY OF COUPLER STEEL TUBE FALSEWORK

To study mechanical properties of coupler steel pipe falsework,it was conducted a series of full-scale researches on the spatial structure of the falsework,and it was obtained that the ultimate bearing capacity of the falsework under different conditions,the destruction pattern and the load-displacement curve of the top-level node.It can be seen that in the 5 working conditions,the working condition 1 without cross bridging causes its supporting capacity to be the smallest;a reduction of step pitch,makes the bearing capacity of condition 4 increase by 13.8% as compared with working condition 3,but the reduction of the horizontal distance makes stability of working condition 5 enhance by 3% than that of working condition 4.Instability of the falsework belongs to the overall instability,the arrangement of the bridging to the support has an important influence to its instability mode,in the following researches,it still need to determine the standard structure of the falsework and then carries out a series of experiments and the fundamental researches on it.The falsework belongs to the steel structure category,it is suggested that when designing and calculating,the sway frames theory should be used and the semi-rigid node should be considered.