Abstract
The influence of the prying action upon the strength of bolted counections, which are subjected to tensile force, are investigated by experiments, using various types specimens of T-stub connection. The main conclusions are as follows : when the thickness of T-flange is small, the strength of the connection is greatly influenced by prying action. Prying force is approximately quantified according to beam theory on the assumption, that T-flange is regarded as a beam, and prying force is considered as a concentrated load. The main factors, which are concerned with prying action, are the thickness of T-flange and the distance between the bolt and T-web. This approximate theory is also applied to unsymmetric T-stub connection as it is. The prying force coefficient (which means the ratio of the prying force to the external tensile force) at ultimate state is approximately a half of the coefficient at separation. When the thickness of T-flange is very small, bending of the plate prevails. The ductility of the connection is very little, while the fracture of bolts prevails. This Tendency gets evident, as T-flange gets thicker and the connection gets stronger. The thickness of flange plate of H-member, which is connected to T-flange, has little influence upon the statical characteristics of the connection, so for as our experiments concern (the thickness varies from 12mm to 25mm, while the diameter of bolt remains 19mm).
