1990 Fiscal Year Final Research Report Summary
Effect of Joint Gaps and Partial Plastic Deformation on Stiffness in Timber Construction and its Probability Evaluation
| Project/Area Number |
01460232
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
林産学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
ARIMA Takanori The University of Tokyo, Faculty of Agriculture, Associate Professor, 農学部, 助教授 (10144057)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAMURA Noboru The University of Tokyo, Faculty of Agriculture Assistant professor, 農学部, 助手 (30180384)
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| Project Period (FY) |
1989 – 1990
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| Keywords | timber construction / gap / friction / damping / pressure sensitive adhesive / semi-rigid joint / rotation spring factor / expansion spring factor |
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| Research Abstract |
Timber construction has clearance and gap between holes and fastener in the joint. In this project the behavior of joint with gaps and structural frame were experimentally and theoritically evaluated. The results obtained were as follows.
1) A wide distribution of gaps leads to a large variance in the stiffness of joints. When the number of units which compose joint increases, the average of stiffness per unit decreases, but the variance tends to be small.
2) The modulus of elasticity of beam with pressure sensitive adhesive is small, but its dynamic elasticity is equal to those with resorcinol adhesive and nail joints. The damping constant and impact absorptive energy to failure of beam is a little larger than those of other joints.
3) Horizontal load and dynamic test for wood bearing wall with braces was carried out and analyzed by models using elastic spring and rotation spring for joint. It shows that deformation of joint could strongly contribute to the total deformation of wall.
4) Truss construction using ball-joint was applied to static and dynamic horizontal load and was analyzed by modal analysis method. Data indicated that this method could be applied in the analysis for struss construction with gaps.
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