The clamping of torque shear high strength bolt is induced when the pin-tail is broken. Sometimes the clamping forces on slip critical connections do not meet the required tension due to torque coefficient dependent on conditions such as outdoor temperature, moisture and dust. From this study, the clamping forces of torque shear bolts at indoor conditions were compared with actual data investigated from 24 construction sites last five years. Similarly to foreign literature results, torque shear bolts showed that torque coefficients were fluctuated greatly by temperature conditions. The range of torque coefficient at indoor conditions was analyzed from 0.126 to 0.158 while tensions were indicated from 179 to 192 Nㆍm. Instead, the range of torque coefficient at site conditions was analyzed from 0.118 to 0.152. Based on this test, the variable trends of torque coefficient subjected temperature can be traced via statistic regressive analysis. In case of indoor conditions, it was showed that the variable of torque coefficient was 0.13% per 1℃, while the variable at actual site conditions reached 2.73% per 1℃.

Difference of two standards, AISC N690 and KEPIC SNG, for the in-plane shear strength was experimentally investigated. In AISC N690, unlike KEPIC SNG, the tie system should be applied to the entire surface of the faceplate. However, using many tie systems is impractical and ineffective due to technical challenges such as difficulty of welding and maintenance. Thus, reducing the number of tie systems is needed, by replacing them with studs. In this study, we experimentally investigated distribution effect of in-plane shear strength connector such as stud and tie bar.

In this study, by comparing the current steel structure design equations find out the problems, we will utilize to make the pipe-gusset joint equations. Representative equations CIDECT and AIJ-02 consider unreinforced and reinforced. As a result, there is some difference. therefore current equations decrease in reliability, in order to propose more accurate design equations need additional testing experimentation through finite element analysis

Finite analysis of tower structure using beam element and shell element. Investigation of collapse mechanism including local and global failure. Verification of analysis model through comparison with actual collapsed tower structure. Propose of analytical ultimate strength of member based on nonlinear analysis of local and partial finite element model.

Finite element analysis using Tower of the beam element. Investigate the mechanisms leg buckling of tower parts. Characterization of the role and behavior of aids and aids to optimize the use of the present one square Envoy maximize workability and economy. The proposed square Envoy existing triangle to reveal that more than reasonable and the absence of nodal wind load compared to the size of history.