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Seismic behaviour of hybrid-fibre reinforced concrete shear keys in immersed tunnels

机译：混杂纤维混凝土剪力键在沉管隧道中的抗震性能

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摘要

This study aims to develop hybrid fibre reinforced concrete (HFRC) for shear keys used in conjunction with immersed tunnels in the Hong Kong-Zhuhai-Macau megaproject. First, HFRC was developed for shear keys, and its mixture proportions were optimised. Second, a testing programme was carried out with 15 specimens, to investigate the seismic behaviours of shear keys with the developed HFRC. The test results reported the failure mode, displacement with respect to the load, energy dissipation capacity, and the ductility of the shear keys with HFRC in the presence of horizontal hysteretic loads. The influences of different material parameters on the seismic behaviours of shear keys were analysed and discussed. Analytical models were also developed to predict the ultimate load-carrying capacity of the shear keys by regression based on the test results. Validations of the predictions from the developed analytical models confirmed their accuracy when compared with test results.
机译：这项研究旨在开发用于剪力键的混合纤维增强混凝土（HFRC），与香港-珠海-澳门大型项目的沉管隧道配合使用。首先，为剪切键开发了HFRC，并优化了其混合比例。其次，用15个样本进行了测试程序，以研究开发的HFRC剪切键的抗震性能。测试结果报告了在存在水平滞后载荷的情况下，HFRC剪切键的失效模式，相对于载荷的位移，能量耗散能力以及延性。分析并讨论了不同材料参数对剪力键抗震性能的影响。还开发了分析模型，以根据测试结果通过回归来预测剪切键的最终承载能力。与测试结果相比，从已开发的分析模型中进行的预测验证证实了其准确性。

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