TY - JOUR
T1 - Dynamic behavior of a long-span cable-stayed bridge with floating towers after the sudden failure of tethers and cables under irregular waves
AU - Jang, Minseo
AU - Lee, Yunwoo
AU - Kim, Seungjun
AU - Kang, Young Jong
N1 - Funding Information:
This research was supported by a grant(20SCIP-B140606-04) from Smart Civil Infrastructure Research Program funded by Ministry of Land, Infrastructure and Transport of Korean government.
Publisher Copyright:
© 2020 National Taiwan Ocean University. All rights reserved.
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2020
Y1 - 2020
N2 - Cable-supported bridges with floating towers do not require fixed piers at the seabed. Therefore, innovative conceptual models have been continuously developed to overcome the limitations of conventional bridges in deep waters. The main floating tower that supports superstructures using stay cables is balanced by the buoyancy of floaters moored by tethers. The applicability of floating bridges should be verified by evaluating the overall stability considering the tether design. Here, various cases of the sudden failure of tethers and stay cables under the environmental conditions of a 100-year return period are simulated in a time-domain. The floating cable-stayed bridges are subjected to constantly changing environmental loads such as wind, waves, and current. The dynamic analysis of these loads was performed, applying the irregular wave load generated by the Joint North Sea Wave Project (JONSWAP) spectrum model. The structural responses of the floating bridges were evaluated via hydrodynamic analysis after the sudden failure was simulated. In this study, various cases were evaluated considering the number of failed tethers and stay cables. When the four tethers suddenly failed in the 100-year return period wave conditions, some of them exhibited structural stress exceeding the yield stress, and others even suffered compression. The effects of the sudden failure of the tethers and stay cables on the change in structural responses and states were directly compared in an intensive parametric study. According to the analytical study, the sudden failure of the tethers induces a significant increase in the dynamic responses of the floating bridges.
AB - Cable-supported bridges with floating towers do not require fixed piers at the seabed. Therefore, innovative conceptual models have been continuously developed to overcome the limitations of conventional bridges in deep waters. The main floating tower that supports superstructures using stay cables is balanced by the buoyancy of floaters moored by tethers. The applicability of floating bridges should be verified by evaluating the overall stability considering the tether design. Here, various cases of the sudden failure of tethers and stay cables under the environmental conditions of a 100-year return period are simulated in a time-domain. The floating cable-stayed bridges are subjected to constantly changing environmental loads such as wind, waves, and current. The dynamic analysis of these loads was performed, applying the irregular wave load generated by the Joint North Sea Wave Project (JONSWAP) spectrum model. The structural responses of the floating bridges were evaluated via hydrodynamic analysis after the sudden failure was simulated. In this study, various cases were evaluated considering the number of failed tethers and stay cables. When the four tethers suddenly failed in the 100-year return period wave conditions, some of them exhibited structural stress exceeding the yield stress, and others even suffered compression. The effects of the sudden failure of the tethers and stay cables on the change in structural responses and states were directly compared in an intensive parametric study. According to the analytical study, the sudden failure of the tethers induces a significant increase in the dynamic responses of the floating bridges.
KW - Floating cable-stayed bridge
KW - Irregular wave
KW - Sudden failure analysis
KW - Tether arrangement
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U2 - 10.6119/JMST.202012_28(6).0014
DO - 10.6119/JMST.202012_28(6).0014
M3 - Article
AN - SCOPUS:85102405185
SN - 1023-2796
VL - 28
SP - 593
EP - 601
JO - Journal of Marine Science and Technology
JF - Journal of Marine Science and Technology
IS - 6
ER -