Seismic experimental study on a concrete pylon from a typical medium span cable-stayed bridge
Seismic experimental study on a concrete pylon from a typical medium span cable-stayed bridge
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典型中跨斜拉桥混凝土桥塔抗震试验研究
DOI：
10.1007/s11709-018-0464-8
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发表时间：
2018-05
影响因子：
3
通讯作者：
Ji Dongbing
中科院分区：
文献类型：
--
作者：
Xu Yan;Zeng Shijie;Duan Xinzhi;Ji Dongbing
我国现行桥梁抗震设计规范要求斜拉桥在强震作用下保持弹性。然而，近年来的地震破坏揭示了桥塔塑性行为的可能性。由于对桥塔的非线性抗震性能缺乏应有的注意，导致对这种广泛建造但经历过较弱地震的结构的抗震性能的理解模糊。针对这一问题，设计了一座1/20缩尺的中跨斜拉桥索塔混凝土模型，并进行了纵向振动台试验。通过对索塔动力响应和抗震性能的测试、评估和比较，揭示了索塔的薄弱环节和非线性抗震性能。结果表明，混凝土桥塔大部分结构在很强的激励下仍保持弹性，这意味着目前的桥塔纵向设计有足够的安全裕度。塔柱最脆弱的部位首先出现在塔柱底部区域，在试验过程中观察到塔柱底部裂纹张开和闭合，然后扩展到下支柱周围的下柱和中柱。
According to the current seismic design codes of bridges in China, cable-stayed bridges have been usually required to remain elastic even subjected to strong earthquakes. However, the possibilities of pylon plastic behavior were revealed in recent earthquake damages. The lack of due diligence in the nonlinear seismic behavior of the pylon has caused a blurry understanding about the seismic performance of such widely built though less strong earthquake experienced structures. In light of this point, a 1/20 scaled concrete pylon model which from a typical medium span cable-stayed bridge was designed and tested on the shaking table longitudinally. The dynamic response and seismic behavior of the pylon were measured, evaluated and compared to reveal its vulnerable parts and nonlinear seismic performance. The results show that most parts of the concrete pylon remain elastic even under very strong excitations, which means a sufficient safety margin for current pylon longitudinal design. The most vulnerable parts of the pylon appeared first at the pylon bottom region, cracks opening and closing at the pylon bottom were observed during the test, and then extended to the lower column and middle column around the lower strut.
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影响因子：
3.6
作者：
W. He;A. Agrawal;K. Mahmoud
通讯作者：
W. He;A. Agrawal;K. Mahmoud
影响因子：
3.6
作者：
Kuei-Chung Chang;Y. Mo;C. C. Chen-C.;L. C. Lai;C. Chou
通讯作者：
Kuei-Chung Chang;Y. Mo;C. C. Chen-C.;L. C. Lai;C. Chou
影响因子：
3.1
作者：
H. Thai;Seung-Eock Kim
通讯作者：
H. Thai;Seung-Eock Kim
DOI：
10.1061/(asce)0733-9399(2001)127:9(968
发表时间：
2001-09
期刊：
Journal of Engineering Mechanics-asce
影响因子：
--
作者：
S. Sture
通讯作者：
S. Sture
影响因子：
5.5
作者：
A. Chandler
通讯作者：
A. Chandler