| 摘要 |
PROBLEM TO BE SOLVED: To propose a buckling bearing force calculation method in a fire of a concrete column.SOLUTION: The buckling bearing force calculation method comprises temperature grasping work S1 for grasping the temperature distribution of a cross section of the concrete column in the fire, modeling work S2 for modeling the cross section of the concrete column into an aggregate of a plurality of elements, Young's modulus calculation work S3 for calculating an instantaneous Young's modulus of the respective elements. flexural rigidity calculation work S4 for calculating the whole flexural rigidity being flexural rigidity of the whole cross section by integrating the flexural rigidity calculated by multiplying the instantaneous Young's modulus by the cross-sectional secondary moment by the whole cross section and buckling stress calculation work S5 for calculating buckling bearing force by substituting the whole flexural rigidity in an Euler buckling formula. Axial force strain of the respective elements is calculated by making a thermal stress analysis by assuming that thermal expansion strain and transitional strain are set as the whole strain in addition to the axial force strain, and that the whole strain of the respective elements becomes equal in the Young's modulus calculation work, so that the instantaneous Young's modulus corresponding to the axial force stain is calculated. |
