Simulation-Based Fracture Control Design of Knock-Off Bolts for Bridges
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- SHOJI Hiroto
- Graduate School of Engineering, Osaka University
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- HAYAMIZU Toshihiro
- Graduate School of Engineering, Osaka University (Present address: Komatsu Ltd.)
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- MORI Koki
- Graduate School of Engineering, Osaka University (Present address: JGC CORPORATION)
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- OZAKI Kento
- Takadakiko Co. Ltd.
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- NAGAKI Hayato
- Takadakiko Co. Ltd.
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- OHMAE Toru
- Takadakiko Co. Ltd.
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- SAGOU Dai
- Takadakiko Co. Ltd.
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- OHATA Mitsuru
- Graduate School of Engineering, Osaka University
Bibliographic Information
- Other Title
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- 橋梁用ノックオフボルトのシミュレーションベース破壊制御設計
Abstract
The purpose of this study is to develop a simulation method for predicting the effect of shape and dimension on shear strength, deformability and fracture behavior of knock-off bolts with circumferential notch and axial hole. Shearing tests for four types of knock-off bolts with various notch depth and axial hole diameter for constant cross-sectional area are conducted. Shear strength of these bolts is almost same value due to same cross-sectional area. On the other hand, the knock-off bolt with a shallower notch has larger deformability. Ductile cracking from notch of knock-off bolts unloaded at maximum load is observed. It is necessary for predicting shear strength and deformability of knock-off bolts to consider ductile crack initiation and growth. Stress states near notch tip of knock-off bolts depend on the angle to loading direction and are influenced by notch depth. The tensile/shear combined stress state dependent ductile damage model is proposed for predicting ductile crack initiation and growth from notch of knock-off bolts. The shear strength and deformability predicted by simulation based on the proposed ductile damage model present good agreement with experimental results. The effect of shape and dimension of knock-off bolt on shear strength and deformability is estimated by means of the developed simulation method. It is demonstrated that cross-sectional area and ratio of notch depth to bolt radius are dominant factor for shear strength and deformability, respectively.
Journal
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- QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY
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QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 40 (4), 175-185, 2022
JAPAN WELDING SOCIETY
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Details 詳細情報について
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- CRID
- 1390012501256774400
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- ISSN
- 24348252
- 02884771
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- Text Lang
- ja
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- Data Source
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- JaLC
- Crossref
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- Abstract License Flag
- Disallowed