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

本研究旨在开发钢桥墩的极限抗震设计和改造方法，为此，根据分析和试验的结果，对钢桥墩的弹塑性行为进行了研究。研究结果可概括为以下几个方面。 1）强度和延性为了提高钢桥墩的抗震性能（即强度和延性），可以考虑两种方法：（1）规定一定的限值根据板的长细比、柱的长细比、加劲肋的刚度等结构参数，（2）在靠近底座的截面内填充混凝土，以防止或延缓板面板的屈曲。我们提出了一种基于大量试验和数值算法的极限抗震设计方法，该方法采用推覆分析来计算桥墩的荷载-位移关系。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，并将本建议的应用扩展到了通用商业软件，例如MARC。 2）拟动力测试利用Hygoken-nanbu地震期间获得的加速度图对模拟钢桥墩的钢箱柱样本进行拟动力测试1995年1月17日神户地区的研究结果表明，自然周期和填充混凝土的存在对钢桥墩的地震响应（最大位移响应和残余位移响应）之间的关系有显着影响。在试验结果的基础上提出了位移响应和残余位移响应，并通过广泛的弹塑性地震响应分析进行了验证。另一方面，通过高延性钢桥墩设计方案的有效性得到了验证。 3）弹塑性地震响应分析根据静态和准静态试验的结果，建立了钢桥墩的滞回模型，并使用伪动态试验验证了所开发的模型，即二参数模型。结果表明，JMA 加速度图对于短桥墩或低桥墩来说是非常剧烈的波。并建立了钢混凝土桥墩的滞回模型。4)弹塑性循环分析利用ABAQUS程序研究了循环荷载作用下箱形或管形钢桥墩的弹塑性行为。名古屋大学开发的修正两表面模型的分析结果与实验结果的比较表明，修正两表面模型可以很好地预测钢结构的非弹性循环行为。参数研究提出了一些经验公式来预测此类桥墩的强度和延性。

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)

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）。

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）。