3-dimentional pseudo-dynamic experiment on steel bridge piers and their hysteretic models

钢桥墩三维拟动力试验及其滞回模型

• 批准号: 14350242
• 负责人: GOTO Yoshiaki
• 金额: $ 6.46万
• 依托单位: Nagoya Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350242/
• 关键词: steel bridge pier; bi-directional load; hysteresis; seismic design; FEM; hysteretic model; cyclic load; local buckling; 耐震設計; 擬似動的実験; 多方向載荷; 疑似動的実験

The objective of the present research is to develop a hysteretic model of thin-walled steel bridge piers subjected to 3D earthquake excitations. Firstly, 3D loading and measuring systems along with the control programs were developed for a 3D pseudo-dynamic experiment. Secondly, by using the 3D experiment system, bi-directional cyclic loading experiments were conducted to investigate the hysteretic behaviors of circular and rectangular steel piers. Thirdly, utilizing these results, the accuracy of the nonlinear FEM shell analyses with the 3-surface constitutive model was examined. It was observed that the accuracy of the analysis gets a little worse when the steel piers are subjected to large plastic deformations. To improve the accuracy, the original 3-surface constitutive model developed by authors was modified by introducing a concept of effective equivalent plastic strain as an internal variable instead of the conventional equivalent plastic strain. Fourthly, extensive nonlinear FE … More M analyses were conducted to assess the effects of structural parameters on the hysteretic behaviors of steel piers under bi-directional cyclic loads. These results were used to derive empirical formulas for the strength and ductility of circular and rectangular steel piers in one principal direction. Lastly, a unidirectional hysteretic model was proposed on the basis of these empirical formulas. This model implicitly considers the effect of the bi-directional cyclic loads and can be directly applicable to the convectional seismic design where the safety of bridge piers is examined by unidirectional earthquake waves. In addition, a multiple spring model was proposed. This model consists of a concentrated mass and a rigid bar with multiple springs located at the pier base. The constitutive relation of each spring is determined by the unidirectional hysteretic behavior of steel piers. Numerical results confirmed that the multiple spring model is an acceptable alternative to the FEM shell analysis for practical purposes. Less

预言的目的是开发3D地震激发的钢桥墩的滞后模型。进行了双向循环载荷，以研究这些结果的圆形钢墩和圆锥形垫子。通过引入等效塑性应变的概念，而不是转换塑性应变。圆形和矩形钢墩在一个主要方向上，根据这些经验公式，提出了单向滞后模型。桥梁的设计是地震波。该模型是由单向温源模型确定的。

项目成果

Effect of displacement control on the errors of multi-directional pseudo-dynamic experiment

位移控制对多向拟动力实验误差的影响

• 发表时间: 2005
• 作者: Obata;M. and Goto;Y.
• 通讯作者: Y.

Experimental and analytical study on stability and ductility of thin-walled columns under bidirectional cyclic load

双向循环荷载作用下薄壁柱稳定性及延性试验与分析研究

• 发表时间: 2005
• 期刊: Proceedings of ICASS05 Vol.1
• 作者: Goto;Y.;Jiang;K.S.;Obata;M.
• 通讯作者: M.

Stability and ductility of thin-walled circular steel columns under cyclic biaxial bending (invited paper)

循环双轴弯曲下薄壁圆钢柱的稳定性和延性（特邀论文）

• 发表时间: 2004
• 期刊: Proc. of The Second International Conference on Steel & Composite Structures, Seoul, Korea, September 2-4, 2004
• 作者: Y.Goto;Kunsheng Jiang;M.Obata
• 通讯作者: M.Obata

Experimental and analytical study on stability and ductility of thin-walled columns under bidirectional cyclic load (invited paper)

双向循环荷载作用下薄壁柱稳定性与延性试验与分析研究（特邀论文）

• 发表时间: 2005
• 期刊: Proc.ICASS05, Shanghai, China, 2005 (to appear)
• 作者: Goto;Y.;Jiang;K.S.;Obata;M.
• 通讯作者: M.

2方向繰り返し荷重を受ける薄肉円形断面鋼製橋脚柱の履歴特性

两个方向循环荷载作用下薄圆截面钢墩柱的滞回特性

• 发表时间: 2005
• 期刊: 土木学会論文集 780/I-70
• 作者: 後藤芳顯;江坤生;小畑誠
• 通讯作者: 小畑誠