This experimental study analyzed the reduction of the load capacity of the system support according to the uninstall bracing members by loading the ultimate load to the 3 - story system support assembly with the presence of bracing members as the key parameter. The load capacity of the 3-story specimen without bracing members is 38.4% of that of the 3-story specimen with bracing members. It is necessary to accurately reflect the installation plan of the bracing members and examine the structural safety of the system support assembly, not a single member, because there is a significant decrease in the load capacity of the system support assembly according to the uninstall of the bracing members.

This paper analyzed the effects of rotational stiffness of wedge connection between vertical and horizontal members of system supports. By simulating the connection condition both a hinge connection, which is considered in the design stage, and a spring with the rotational stiffness reflecting the actual behavior, the critical buckling load and the maximum combination stress ratio are compared. The results show that hinge condition somewhat underestimate the actual behavior of vertical members of system supports. However, it is also noted that the horizontal member represents the increased stress due to the rotational stiffness of the connection.

This study suggests a PM interaction curve as a management element to prevent collapse of system supports. the FE analysis result show the element buckes when the element is beyond the PM curve. Since the system is able to resist a certain flexural strengths it is determined that the PM curve is suitable for a management element.

Temporary structures are essential elements in the high-rise structures. They are various and one of them, prefabricated shoring system is very useful. Because it is easy to install prefabricated shoring system. But collapse disaster of prefabricated shoring system occurs every year. In most situations, design deficiency and lacking in strength of vertical member give rise to the collapse. In this study, buckling stability of prefabricated shoring system was analyzed in the design phase.