A Study of Estimation for Steel Bridge Piers considering torsion effects

考虑扭转效应的钢桥墩估算研究

• 批准号: 12450183
• 负责人: USAMI Tsutomu
• 金额: $ 9.6万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12450183/
• 关键词: Steel Bridge Piers; Local Buckling; Torsional deformation; Seismic Performance; Elasto-plastic Analysis; Cyclic loading tests; Out-of-plane deformation; Serviceability; 弾塑性有限変立解析

The present study is aimed at an estimation of steel bridge piers subjected to out-of-plane cyclic loading. For this purpose, Elastoplastic analysis was carried out at fast considering torsion effect Next, these numerical results were verified by the seismic performance tests of Inverted L-shaped steel bridge piers. Finally, the experimental functions estimating the strength and deformation capacity for steel bridge piers subjected to out-of-plane cyclic loadings are developed. The following conclusions can be obtained :1) With the increase in eccentric distance, the loading-carrying capacity of the columns is greatly reduced.2) Comparison of the buckling modes indicates that the out-of-plane bending moment dominates the hysteretic behavior of the columns, and the inward deformation on the eccentric side is attributed to the effect of the cyclic twisting moment.3) The seismic performance testing system for inverted L-shaped steel bridge piers was developed.4) The eccentricity ratio e/r is selected as 0, 2 and 3, and its influences on the inelastic behavior, ultimate strength and ductility are investigated. It is found that the Inverted L-shaped steel bridge pier deformaed largly in the in^plane direction although the pier was loaded in the out-of-plane direction.5) From the analytical results, it is realized that the eccentric vertical load and cyclic loading pattern will cause a significant in-plane displacement, and in the case of inverted L-shaped piers, strength deterioration is greater than that of T-shaped piers.6) An extensive parametric analysis is performed to propose empirical formulas in order to evaluate strength and ductility of inverted L-shaped box-section steel bridge piers.

本研究的目的是估计受到面外循环载荷的钢桥墩。为此，考虑到扭转效果，在快速考虑的情况下进行了弹性塑料分析，通过反向L形钢桥墩的地震性能测试验证了这些数值结果。最后，开发了估计经面外循环载荷的钢桥墩的强度和变形能力的实验函数。可以得出以下结论：1）随着偏心距离的增加，柱的负载能力大大降低。2）屈曲模式的比较表明，平面外弯矩占主导地位圆柱以及偏心侧的内部变形归因于环状扭曲力矩的效果。3）开发了倒置L形钢桥墩的地震性能测试系统。4）选择了偏心率E/R由于0、2和3，研究了对非弹性行为的影响，最终的强度和延展性将被研究。发现倒的L形钢桥码头在^平面方向大大变形，尽管码头是在平面外方向上加载的。5）从分析结果中，可以意识到偏心的垂直载荷和循环载荷模式将导致显着的平面位移，在倒L形墩的情况下，强度劣化大于T形墩的较高。6）进行广泛的参数分析以提出经验公式以提出经验公式以便进行经验公式评估倒置L形盒式钢桥墩的强度和延展性。

项目成果

Chusilp, P., Usami, T., Ge, H.B.: "Analytical study on strength and ductility of stiffened box-shaped steel members subjected to shear loading"Journal of Structural Engineering,JSCE. (掲載予定). (2002)

Chusilp, P.、Usami, T.、Ge, H.B.：“受剪切载荷作用的加劲箱形钢构件的强度和延展性的分析研究”，结构工程学报，JSCE（即将出版）。

青木微彦, 錦木真一, 渡辺俊輔, 鈴木森晶, 宇佐美勉, 葛漢彬: "面外繰り返し水平力を受ける逆L型鋼製箱形断面橋脚の強度と変形能に関する実験的研究"土木学会論文集. No.724/I-62. 213-223 (2003)

Mihiko Aoki，Shinichi Nishikiki，Shunsuke Watanabe，Akira Suzuki Mori，Tsutomu Usami，Akira Katsuran：“反复平面外水平力作用下倒L形钢箱形截面桥墩的强度和变形能力的实验研究”论文集日本土木工程师学会第 724/I-62 (2003) 号。

葛漢彬, 高聖彬, 宇佐美勉: "鉛直荷重が偏心して作用する鋼製橋脚の操り返し弾塑性挙動に関する数値解析的研究"土木学会論文集. No.654/I-52. 271-284 (2000)

Akira Katsuran、Akira Taka、Tsutomu Usami：“偏心垂直荷载作用下钢桥墩回弹弹塑性行为的数值分析研究”日本土木工程师学会会刊第 654/I-52（2000 年）。

Liu, Q., Kasai, A., Usami, T.: "Two hysteretic models for thin-walled pipe-section steel bridge piers"Engineering Structures. Vol.23. 186-197 (2001)

Liu, Q., Kasai, A., Usami, T.：“薄壁管型钢桥墩的两种滞回模型”工程结构。

葛漢彬, 渡辺俊輔, 宇佐美勉, 青木徹彦: "面外繰り返し外力を受ける逆L形鋼製箱形断面橋脚の耐震性能に関する解析的研究"土木学会論文集. (登載予定).

Akira Katsuran、Shunsuke Watanabe、Tsutomu Usami、Tetsuhiko Aoki：“反复受平面外外力作用的倒 L 形钢箱形截面桥墩的抗震性能分析研究”，日本土木工程学会论文集。 （待发布）。