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: This study examined the effects of the minimum horizontal load on the structural behaviors and safety of system supports. The minimum horizontal load was frequently ignored in the design of system supports even though the level of that load was spec ified in the code and guide in Korea such as ‘Standard Specification in Temporary Construction’ and ‘Guide to Installation of Shores for a Concrete Bridge’ . To examine the effects of considering the minimum horizontal load, the finite element analysis were performed for various system supports. By varying installing parameters of system supports such as the vertical member spacing, the installat ion height, and the thickness of slab, the maximum combined stress ratios were estimated to investigate the structural safety of system sup ports. The results showed similar axial stress in vertical members but an increase in bending stress with a consideration of the horizontal load. The combines stress ratios are remarkably increased due to the consideration of the horizontal load. Consequently, the system suppo rts, which were initially estimated to be safe when only the vertical loads were considered, were changed to be unsafe in most cases by th e effects of the both the vertical and horizontal stresses. Therefore, the minimum horizontal load following the code and the guide is an es sential load that could control the structural safety of system supports.

Effects of Minimum Horizontal Load on Structural Safety of System Supports