| 摘要 |
PROBLEM TO BE SOLVED: To obtain a calculation method, in which a beam spring can be analyzed properly so as to match with an actual state, by using a joint part, in which joint faces on side faces in the ring direction of block pieces regarding identical rings as a rotating spring, and analizing the beam spring by using a rotating spring constant expressed by a specific expression. SOLUTION: A plurality of longitudinal ribs 9 are installed so as to be stridden in corresponding parts on inside faces of opposite main beam plates 6, and reinforcing bars for crack prevention are arranged at the inside of hearting concrete plates 7. In addition, rod-shaped protrusion couplings 10 are installed near butt joint plates on outside faces of the main beam plates 6. Then, when a butt joint part in which joint faces are butted is used as a rotating spring so as to analyze a beam spring, a rotating spring constant Kθ(tf.m/ rad) is calculated by using an expression. In the expression, N represents an axial force (tf) acting on a butt face, M represents a bending moment (tf.m) acting on the butt face, E' represents a conversion elastic coefficient (tf/m2) in a joint contact part, and b' represents a contact with (m) on the joint face.
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