1994 Fiscal Year Final Research Report Summary
The Analysis of the Post Peak Behaviors of R.C.Structures
| Project/Area Number |
05452227
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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 |
土木材料・力学一般
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| Research Institution | Nagoya University |
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Principal Investigator |
TANABE Tadaaki Nagoya University, School of Engineering, Professor, 工学部, 教授 (50144118)
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| Co-Investigator(Kenkyū-buntansha) |
HIGAI Takeshi Yamanashi University, School of Engineering, Professor, 工学部, 教授 (70115319)
NIWA Junichiro Nagoya University, School of Engineering, Associate Professor, 工学部, 助教授 (60164638)
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| Project Period (FY) |
1993 – 1994
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| Keywords | Maximum Load Point / Sudden Change of Displacement / Tangential Stiffness Matrix / Eigenvalue / Bifurcation Point / Failure Mode / Bridge Pier / Jump Condition of Constitutive Equation |
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| Research Abstract |
For the important facility such as nuclear power stations, it is exceedingly important to know the maximum load point or the point where the deformation will change suddenly. To achieve this goal, the bifurcation point, which was found to be an important index, was searched out by investigating the eigenvalue of the structural tangential stiffness matrix, and at the same time, the jump condition of the tangential stiffness matrix was analyzed and the relation between each failure mode was studied. As a result, it has been made clear that the structural failure and the sudden change in deformation take place when one or more of the eigenvalues cease to be positive. After numerically analyzing many R.C.bridge piers, the equation for the ductility was derived out.
Corresponding to the jump condition of the tangential stiffness matrix, the plastic potential function of the Drucker-Prager type constitutive relation was obtained by analyzing plain concrete specimen with a rectangular section such that the experiment coincide with the analytical results. For the actual structures such as R.C.shear wall, column and the other kind of structures made of composite material, the similar analysis have been carried out to identify their failure modes analytically. It is thought that those knowledge have some special importance in the problem of earthquake engineering and are strongly desired to be developed more in the future.
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