1990 Fiscal Year Final Research Report Summary
Earthquake-proof of Concrete Stave Silos with Structural Discontinuity
| Project/Area Number |
63460149
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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 |
土木構造
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| Research Institution | Hokkaido University |
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Principal Investigator |
YOSHIMURA Jin Hokkaido University, Fac. of Engineering, Professor, 工学部, 教授 (20001133)
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| Co-Investigator(Kenkyū-buntansha) |
SASAKI Yasuhiko Hokkaido Univ., Fac. of Eng. Assistant., 工学部, 助手 (10125320)
MIKAMI Takashi Hokkaido Univ., Fac. of Eng. Assistant., 工学部, 助教授 (00002303)
NIRASAWA Noriyoshi Hokkaido Univ., Fac. of Eng. Assistant, Pro.,, 工学部, 助教授 (50002035)
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| Project Period (FY) |
1988 – 1990
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| Keywords | Concrete / Stave silo / Tower Silo / Earthquake - Proof / Dynamics / Seismic Response |
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| Research Abstract |
Concrete stave silos are segmental silo structures which are cylindrically assembled from precast concrete blocks called "staves" and held together by exterior adjustable steel hoops.
A series of shaking table tests was performed using a 1/8- scale stave sile model and a cylindrical shell model. The effects of the joints of staves and of a stored material on the dynamic behavior are also investigated. The experimental results reveal that the hysteretic restoring force characteristics of concrete stave silos are caused by not only the damping effect of a stored material but also their structural discontinuity.
For dynamic analysis of concrete stave silos with such structural discontinuity, a new discrete model called "stave silo element" is developed. A method for determining spring stiffness in stave silo elements is also proposed : at first, the equivalent spring stiffness to the continuous cylindrical shell are calculated and then a reduction factor of the equivalent stiffness is estimated. To verify the validity of stave silo elements and the method of the equivalent stiffness and its reduction factor, seismic response analyses of a stave silo model are carried out and compared with its experimental results. A good agreement was obtained.
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