A Study on Development of Ultimate Earth quake-Resistance Design and Retrofit Methods for Steel Bridge Piers

钢桥墩极限抗震设计及改造方法的研究进展

• 批准号: 07555142
• 负责人: USAMI Tsutomu
• 金额: $ 6.08万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555142/
• 关键词: Steel bridge pier; Seismic design; Ultimate Strength; Ductility; Failure; Buckling; Seismic response analysis; Restoring force model; ハイブリッド実験; 充填コンクリート

The present study is aiming at developing ultimate earthquake-resistance design and retrofit methods for steel bridge piers. For this purpose, elasto-plastic behavior of steel bridge piers is investigated analytically and experimentally. Based on the results obtained from both the analysis and test, the findings can be summarized in the following aspects.1) Strength and ductilityTo improve the seismic performance (i.e., strength and ductility) of steel bridge piers, two ways are considered : (1) to specify certain limits tothe structural parameters such as plate slenderness ratio, column slenderness ratio, and stiffener's rigidity, (2) to fill concrete into the section near the base so as to prevent or delay buckling of plate panels. As for the concrete-filled steel bridge piers, we proposed an ultimate earthquake-resistance design method based on a large numbers of tests and numerical analyzes. In the proposal, a push-over analysis is employed to compute the load-displacement relation … More of the pier. The strength and ductility computed with the proposed method are compared with experimental results. Moreover, a similar analytical investigation on the strength and ductility of steel octagonal section columns is also carried out. Furthermore, the application of the present proposal is extended to generalized commercial software such as MARC and ABAQUS for practical design.2) Pseudo-dynamic TestsSteel box column specimens modeling steel bridge piers are tested pseudo-dynamically using the accelerograms obtained during the Hygoken-nanbu earthquake that struck Kobe area on Jan.17,1995. The results indicate that the natural period and presence of the filled-in concrete have a significant effect on the seismic response (maximum displacement response and residual displacement response) of steel piers. A relation between the maximum displacement response and residual displacement response is proposed on the basis of the test results, and verified by an extensive elasto-plastic seismic response analysis. On the other hand, the validity of the proposal for designing high ductility steel bridge piers is verified by the pseudo-dynamic test.3) Elasto-plastic Seismic Response AnalysisFrom the results of static and quasi-static tests, a hysteresis model of the steel bridge pier is constructed. The developed model named 2-Parameter Model is verified using the pseudo-dynamic test results, and applied to clarify the seismic behavior of steel bridge piers under the Hyogoken-nanbu carthquake. The results show that the JMA accelerogram is a tremendously severe wave for short piers or those with low natural periods. Also, a hysteresis model is constructed for the concrete-filled steel bridge piers.4) Elasto-plastic Cyclic AnalysisElasto-plastic Behavior of steel bridge piers with box or pipe sections under cyclic loading is studied using the ABAQUS program with the inclusion of the modified two-surface model developed at Nagoya University. Comparison between the analytical and experimental results indicates that the modified two-surface model can be used to predict the inelastic cyclic behavior of steel structures with good accuracy. From the parametric study some empirical formulas are proposed to predict the strength and ductility of such piers. Less

本研究旨在发展钢桥墩的极限抗震设计和加固方法。为此，对钢桥墩的弹塑性性能进行了理论分析和试验研究。根据分析和试验的结果，可以将研究结果总结为以下几个方面：1）强度和延性为了提高抗震性能（即，考虑了两种方法：（1）对板件伸长比、柱件伸长比、加劲肋刚度等结构参数进行一定的限制;（2）在靠近基底的截面中填充混凝土，以防止或延缓板件的屈曲。针对钢管混凝土桥墩，在大量试验和数值分析的基础上，提出了一种极限抗震设计方法。在该建议中，推覆分析被用来计算荷载-位移关系 ...更多信息 的码头。用该方法计算的强度和延性与试验结果进行了比较。此外，还对八角形截面钢柱的强度和延性进行了类似的分析研究。拟动力试验利用1995年1月17日科比地区发生的日本兵库县南部地震的加速度记录，对模拟钢桥墩的箱形钢柱试件进行了拟动力试验。结果表明，自振周期和填充混凝土的存在对钢桥墩的地震反应（最大位移反应和残余位移反应）有显著影响。根据试验结果，提出了最大位移反应与剩余位移反应之间的关系，并通过大规模弹塑性地震反应分析进行了验证。通过拟动力试验验证了高延性钢桥墩设计方案的有效性。3）弹塑性地震反应分析根据静力和拟静力试验结果，建立了钢桥墩的滞回模型。利用拟动力试验结果对所建立的模型进行了验证，并将其应用于研究兵库县南部地震作用下钢桥墩的抗震性能。结果表明，对于短桥墩或自振周期较低的桥墩，JMA加速度记录是一种非常强烈的波。4）弹塑性循环分析采用名古屋大学开发的改进的双面模型，利用有限元软件ABAQUS对箱形和圆管形钢桥墩在循环荷载作用下的弹塑性性能进行了研究。分析结果与试验结果的对比表明，修正的双曲面模型可以较好地预测钢结构的弹塑性循环性能。通过参数研究，提出了一些经验公式来预测这种桥墩的强度和延性。少

项目成果

Yoshizaki, K., Usami, T., and Saizuka, K.: "Components of Earthquake Waves Causing Severe Damage to Steel Bridge Piers" J.of Struct.Mech.and Earthquake Eng., JSCE. No.584/I-42. 125-134 (1998)

Yoshizaki, K.、Usami, T. 和 Saizuka, K.：“造成钢桥墩严重损坏的地震波成分”J.of Struct.Mech.and Earthquake Eng.，JSCE。

才塚邦宏・宇佐美勉・芳崎一也・鈴木森晶: "兵庫県南部地震観測地震波を用いたハイブリッド地震応答実験による鋼製橋脚の激震時挙動" 土木学会論文集. No.556/I-38. 119-129 (1997)

Kunihiro Saizuka、Tsutomu Usami、Kazuya Yoshizaki 和 Akira Suzuki Mori：“基于使用兵库县南部地震观测到的地震波进行的混合地震响应实验，研究强震期间钢桥墩的行为”，日本土木工程师学会学报，第 2 期。 .556/I-38 .119-129 (1997)

葛西昭・天野麻衣・宇佐美勉・葛 漢彬・岡本真悟・前野裕文: "コンクリート部分充填鋼製橋脚の非線形解析と実験" 鋼製橋脚の非線形数値解析と耐震設計に関する論文集. 153-160 (1997)

Akira Kasai、Mai Amano、Tsutomu Usami、Akira Kuzu、Shingo Okamoto、Hirofumi Maeno：《部分填充混凝土钢桥墩的非线性分析与实验》钢桥墩非线性数值分析和抗震设计论文集（1997）。

鈴木森晶・水越秀和・宇佐美勉: "鋼製橋脚の非線形動的解析" 鋼製橋脚の非線形数値解析と耐震設計に関する論文集. 245-252 (1997)

Akira Suzuki Mori、Hidekazu Mizukoshi、Tsutomu Usami：《钢桥墩的非线性动力分析》钢桥墩非线性数值分析和抗震设计论文集 245-252 (1997)。

葛 漢彬・高 聖彬・宇佐美 勉: "鋼製補剛箱形断面橋脚の繰り返し解析と耐震性評価" 鋼製橋脚の非線形数値解析と耐震設計に関する論文集. pp.85-92 (1997)

Hanbin Kuzu、Kiyoaki Ko 和 Tsutomu Usami：“钢加强箱形截面桥墩的重复分析和抗震评估”关于钢桥墩非线性数值分析和抗震设计的论文集，第 85-92 页（1997 年）。