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Applicability of finite element method to collapse analysis of steel connection under compression

有限要素法による接合部の崩壊分析

Zhou, Z.; 西田 明美; 桑村 仁*

Zhou, Z.; Nishida, Akemi; Kuwamura, Hitoshi*

鋼部材接合部の構造力学的性能の研究には、接合部の崩壊挙動を詳細に検討する必要がある。本研究では、有限要素法と実験により、圧縮荷重を受ける角錐-角筒ソケット接合部の限界荷重を検討した。有限要素法解析においては四節点のシェル要素を使って接合部をモデル化し、三種類の解析、すなわち線形座屈解析,非線形座屈解析とRiks法解析を実施した。線形座屈解析では、座屈が起きる直前までは線形状態であることを前提とし、圧縮荷重は直接加えた。非線形座屈解析では、座屈前までは非線形解析を行い、材料非線形と大変形を考慮した。Riks法解析では、非線形と大変形を考慮し、Riksメソッドを使用した。これら有限要素解析の結果と実験結果と比較したところ、Riks法解析の結果と実験結果の一致は良好であり、鋼部材接合部の崩壊分析に適用できることがわかった。

It is often necessary to study the collapse behavior of steel connections. In this study, the limit load of the steel pyramid-to-tube socket connection subjected to uniform compression was investigated by means of FEM and experiment. The steel connection was modeled using 4-node shell element. Three kinds of analysis were done:linear buckling analysis, nonlinear buckling analysis and Riks method analysis. For linear buckling analysis uniform pressure was loaded directly. For nonlinear buckling analysis uniform pressure was loaded gradually and nonlinear material properties and large displacement were considered. For Riks method analysis uniform pressure was loaded by using the modified Riks method, and nonlinear material properties and large displacement were considered. The results of FEM analysis were compared with the experimental results. It can be concluded that arc length analysis is most suitable for collapse analysis of steel connection under compression.

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