The Failure Analyses of Shear Tab Connections at High Temperatures
碩士 === 國立成功大學 === 土木工程學系碩博士班 === 97 === This thesis utilized a three-dimensional nonlinear finite-element program to study the failure modes and strength variations of the commonly used shear tab connections in steel framing at high temperatures. Due to the catenary effect of steel beam members in...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2009
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| Online Access: | http://ndltd.ncl.edu.tw/handle/10821597740826974889 |
| Summary: | 碩士 === 國立成功大學 === 土木工程學系碩博士班 === 97 === This thesis utilized a three-dimensional nonlinear finite-element program to study the failure modes and strength variations of the commonly used shear tab connections in steel framing at high temperatures. Due to the catenary effect of steel beam members in the temperature rising process and the shrinkage effect of steel beam members in the temperature decreasing process, the shear tab connections are subjected to the forces different from the vertical shear forces at ambient temperature and having the failure modes different from those at ambient temperature. This research studied the strength and failure mode variations of the shear tab connections at various high temperatures and various force angles of tensile loads, and also compared the high temperature structural behaviors of shear tab connections using fire-resistant steel and normal structural steel. The three-dimensional nonlinear finite-element results will be compared with the results computed from AISC-LRFD formulas to examine the feasibility of using AISC-LRFD formulas to evaluate the strengths of shear tab connections subjected to the tensile loads of various force angles at high temperatures. The force angle-strength diagrams show that the strengths and failure modes of shear tab connections change with the force angles, and the force angle corresponding to the maximum or minimum strength in the force angle-strength diagrams is usually the angle of failure mode transition.
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