EXPERIMENTAL STUDIES OF LOAD CAPACITIES OF DOUBLE-LAYER SHORING SYSTEMS

Abstract

The most common shoring system used in mid-headroom buildings in Taiwan is the double-layer shoring system made of wooden shores or adjustable steel-tube shores or a combination of both. This study identifies the causes of shoring system collapse and proposes solutions that ensure the safety and stability of double-layer shoring systems. The test results show that the load capacity is the largest for a double-layer shoring system set by the lateral supports along the four sides. In terms of connections of horizontal stringers, the failure models of and double are extremely similar. The shoring members in the system tend to move toward the overlap position after loading. The single butt connection is recommended to replace these two overlapping connections in construction sites since the former provides higher load capacity in shoring systems. In terms of the eccentric load, load capacity when shoring arrangements of the top and bottom stories are not directly symmetrical is lower than that of the top and bottom stories with a directly symmetrical arrangement. The load capacity is increased considerably when a shoring system is reinforced with V-shaped inclined braces. The load capacity of a shoring system with a setup combining wooden shores and adjustable steel-tube shores is higher than that of a system reinforced with wooden shores only.