1992 Fiscal Year Final Research Report Summary
Development of a new wonder frame constriction by applying posts and beams with follow core
| Project/Area Number |
02556020
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| Research Category |
Grant-in-Aid for Developmental 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 |
OKUMA Motoaki Univ. of Tokyo, Fac. of Agr., Professor, 農学部, 教授 (80011906)
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| Co-Investigator(Kenkyū-buntansha) |
FURUSAWA Shin Ichijo Construction Co. Researc, 研究員
HIRANO Shigeru Ichijo Construction Co. Researc, 主任研究員
NAKAMURA Noboru Univ. of Tokyo, Fac. of Agr. Instructor, 農学部, 助手 (30180384)
SHIDA Satoshi Univ. of Tokyo, Fac. of Agr. Instructor, 農学部, 助手 (00201541)
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| Project Period (FY) |
1990 – 1992
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| Keywords | Glue-lam / LVL / Axial bolt / Hollowed post / Finger joint / Long span beam / Bearing wall |
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| Research Abstract |
Studies were divided into following two subjects.
I. Shearing properties of wall frameworks composed of LVL posts with hollow cores Shearing tests of wall frameworks fixed with long bolts were conducted.
Experimental results are summarized as follows:
* The rising of the post where the lateral load was applied and sinking of the opposite side was so small that the rotation of the wall was almost equal to zero.
* When a post was subjected to lateral loading, the post remained straight and did not bend. Consequently, the post resistance to the lateral load may have been due to the partial compression strength generated at the bottom of the post towards the horizontally attached sill and girder. For this reason, the shearing strength was smaller than expected.
II. End jointing of glue-lam beam and bending properties of the jointed beams. Larch glue-lams with two or four holes longitudinaly on the cross section were end jointed by finger jointing and fastened with long bolts. These end jointed beams were tested by four points bending. The MOE was shown to be increased by the moment at the both ends of the beam which generated by the tensile stress of the bolts. Also, the MOR of the jointed beam increased. After the failure of finger jointing, the beam still keeps a load bearing capacity to a certain extent on account of the existence of bolts. This system is recognized to be safe and very reliable.
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