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Present Status and Prospects of Research on Flexible Joint Models of Immersed Tube Tunnels
(1 Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015；2 College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058)
Abstract The flexible joint of an immersed tube tunnel, which has large flexibility, can adapt to the uneven settle? ment caused by soft riverbed and meet the aseismic requirements and so has been widely used in practical engineering.However, it is difficult to build a model since there are many parts for the flexible joint and the functions are complex, thus the results of static and dynamic analysis are not accurate. In this paper, the types of joints and basic structures of flexible joints of the immersed tube tunnel were introduced, relevant review and summarization of the present status of research on flexible joint models both at home and abroad were presented with respects to theoretical calculation models and numerical calculation models, the function mechanisms of various kinds of models for flexible joints were described and the rationality and disadvantages were analyzed, finally some suggestions were proposed regarding the research of flexible joint model. Specifically, the model test of joints may be taken to make the results to be more intuitive; the main joint parts were considered and reasonable initial conditions were input,the stiffness of flexible joints was described by numerical solution; the reliability of joint models was verified by contrastive analysis with various research methods or models.
Abstract：
The flexible joint of an immersed tube tunnel, which has large flexibility, can adapt to the uneven settle? ment caused by soft riverbed and meet the aseismic requirements and so has been widely used in practical engineering.However, it is difficult to build a model since there are many parts for the flexible joint and the functions are complex, thus the results of static and dynamic analysis are not accurate. In this paper, the types of joints and basic structures of flexible joints of the immersed tube tunnel were introduced, relevant review and summarization of the present status of research on flexible joint models both at home and abroad were presented with respects to theoretical calculation models and numerical calculation models, the function mechanisms of various kinds of models for flexible joints were described and the rationality and disadvantages were analyzed, finally some suggestions were proposed regarding the research of flexible joint model. Specifically, the model test of joints may be taken to make the results to be more intuitive; the main joint parts were considered and reasonable initial conditions were input,the stiffness of flexible joints was described by numerical solution; the reliability of joint models was verified by contrastive analysis with various research methods or models.
2019, Vol. 56 