Study on Seismic Characteristics of Partially Concrete-Filled Steel Bridge Piers with Thin-Walled Stiffened Cross Section

薄壁加筋断面部分混凝土钢桥墩抗震特性研究

• 批准号: 07455186
• 负责人: NAKAI Hiroshi
• 金额: $ 4.99万
• 依托单位: Osaka City University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 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-07455186/
• 关键词: Composite column; Bridge pier; Partially encased concrete; Ultimate strength; Ductility; Cyclic loading; Cyclic loading of gradual increase; Hybrid test

(1)The concrete-filled steel column specimen consisting of stiffened plates with the width-thickness parameter R=0.7 had about 1.2 times the ultimate strength, 1.9 times the ductility, and 2.7 times the hysteresis energy of the corresponding steel column specimen with the same steel cross section and without encased concrete.(2)The deterioration of the strength of a bridge pier under cyclic loading becomes significant at the loading levels where a component stiffened plate in the pier buckles, and then a crack occurs in welding part at the corners of the cross section or the column base.(3)The height of the encased concrete in the concrete-filled steel bridge piers should be determined according to the distributions of the applied and resistance bending moments.(4)Longitudinally stiffened plates can effectively be used in the concrete filled steel bridge piers, because the local buckling of the longitudinal stiffeners are prevented by the encased concrete.(5)The steel bridge piers with … More stiffened plates of R=0.7 may be seriously damaged by such strong inland type earthquakes such as the Hyogo-Ken Nambu Earthquake.(6)Local buckling occurred in stiffened plate with R=0.7 in the upper steel part of the steel column specimen filled partially with concrete in the lower quarter of the column height by using studs, when it was subjected to large horizontal displacement in one direction. The effect as a composite column can not be expected in the case of this failure mode in the steel part.(7)The maximum response acceleration of the bridge piers under consideration is about 1.3 times the maximum seismic acceleration at their pier bases.(8)The ultimate strength of the steel column specimen with stiffened plates having R=0.7 decreased substantially at a few number of loading cycles because of a longitudinal crack at a corner of the cross section occurred, while a transverse crack occurred at welding part on the column base in the case of the steel column specimen consisting of the stiffened plates of R=0.35. Welding of thess parts should, therefore, be designed and fabricate against not only strength but also adequate ductility.(9)The ultimate strength and ductility of steel bridge piers consisting of the stiffened plates of R=0.35 does not decrease substantially, even after the action of such strong earthquakes such as the Hyogo-Ken Mambu Earthquale.(10)The seismic design method in the Japanese Specification for Highway Bridges is apt to conservative one against the inland type earthquakes of level 2 and type II. Less

（1）宽厚比为R=0.7的加劲板钢管混凝土柱试件的极限承载力、延性和滞回耗能分别是相同截面的无外包混凝土柱试件的1.2倍、1.9倍和2.7倍。（2）在反复荷载作用下，当桥墩中的构件加劲板发生弯曲时，桥墩的强度劣化变得显著，然后在截面角部或柱脚的焊接部分出现裂纹。（3）钢管混凝土桥墩外包混凝土的高度应根据作用弯矩和抵抗弯矩的分布情况确定。（4）纵向加劲肋可以有效地应用于钢管混凝土桥墩中，因为外包混凝土可以防止纵向加劲肋的局部屈曲。（5）钢桥墩， ...更多信息 R=0.7的加强板可能被诸如兵库县南部地震的强烈内陆型地震严重损坏。（6）在柱高的下1/4部分填充混凝土的钢柱试件中，当上部钢筋部分的R=0.7的加劲板在单向水平位移作用下发生局部屈曲。在钢件出现这种破坏模式的情况下，不能预期组合柱的效果。（7）有关桥墩的最大反应加速度约为桥墩底部最大地震加速度的1.3倍。（8）R=0.7的加劲板钢柱试件的极限强度在几个荷载循环次数下大幅下降，因为在横截面的角部处出现纵向裂纹，而在由R=0.35的加劲板组成的钢柱试件的情况下，在柱脚上的焊接部分处出现横向裂纹。因此，这些部件的焊接设计和制造不仅要考虑强度，还要考虑足够的延展性。（9）由R=0.35的加劲板构成的钢桥墩的极限强度和延性即使在诸如兵库县曼布地震这样的强烈地震的作用下也不会显著降低。（10）日本公路桥梁规范中的抗震设计方法对内陆型地震2级和II型地震倾向于保守。少

项目成果

中井 博・北田俊行・中西克佳・渡邉浩延・大東和徳: "補剛箱形断面を有する部分合成橋脚柱の地震時挙動に関する実験的研究" 土木学会関西支部平成9年度年次学術講演会概要集. I-7-1-I-7-2 (1997)

Hiroshi Nakai、Toshiyuki Kitada、Katsuyoshi Nakanishi、Hironobu Watanabe、Kazunori Daito：《带有加劲箱形截面的部分组合桥墩柱抗震性能的实验研究》日本土木工程学会关西分会1997年学术年会摘要集.I-7-1-I-7-2 (1997)

Watanabe, H., Nakai, H., Kitada, T.and Nakanishi, K.: "Experimental Study on Ductility of Partially Composite Bridge Piers Filled with Concrete in Their Lower Part" Proceedings of Annual Conference of JSCE. Vol.51, No.1A. 40-41 (1996)

Watanabe, H.、Nakai, H.、Kitada, T. 和 Nakanishi, K.：“下部填充混凝土的部分组合桥墩延性的实验研究”日本混凝土学会年会论文集。

Watanabe, H., Nakai, H., Kitada, T., Nakanishi, K.and Daitoh, K.: "Experimental Study on Ductility of Partially Composite Bridge Piers with Stiffened Box Cross Section under and after Earthquake" Proceedings of Annual Conference of JSCE. Vol.52, No.1A. 16

Watanabe, H.、Nakai, H.、Kitada, T.、Nakanishi, K.和 Daitoh, K.：“地震作用下和震后部分复合材料桥墩延展性的实验研究”年会论文集

中井博: "コンクリートを基部のみに充填した合成橋脚柱の耐震性に関する実験的研究" 土木学会関西支部 平成8年度年次学術講演会講演概要集. I-136 (1996)

Hiroshi Nakai：“仅在底部填充混凝土的复合桥墩柱的抗震性实验研究”日本土木工程师学会关西分会 1996 年度学术讲座摘要（1996）。

中井博: "薄膜補剛箱形断面を有する鋼製・合成橋脚柱の耐荷力と変形性能とに関する実験的研究" 構造工学論文集. Vol.43A(印刷中). (1997)

Hiroshi Nakai：“薄膜加筋箱形截面钢和复合材料桥墩柱的承载能力和变形性能的实验研究”《结构工程杂志》第 43 卷（出版中）。