| 摘要 |
<P>PROBLEM TO BE SOLVED: To easily analyze elastic-plastic action of a steel beam during a fire with high accuracy and to greatly reduce an analysis time, a computer load and work labor. <P>SOLUTION: A quaternary simultaneous equation having an equation showing respective balances of axial force and a moment at an axis of member orthogonal cross section of a material end of a steel beam, an equation showing a displacement conformity condition in an axis of member direction at the material end of the steel beam, and an equation showing a yield condition at the axis of member orthogonal cross section of the steel beam made plastic by a temperature rise is created. An unknown solution of the quaternary simultaneous equation is calculated by solving the quaternary simultaneous equation. Axial force N, a plastic area length l<SB POS="POST">p</SB>, and temperature histories of compressive strain ε<SB POS="POST">c</SB>and tensile strain ε<SB POS="POST">t</SB>are calculated by integrating the solution of the quaternary simultaneous equality by temperature T. <P>COPYRIGHT: (C)2013,JPO&INPIT |
