TY - JOUR
T1 - Risk-based optimization of seismic mitigation devices constrained by user-defined components importance
AU - Zhong, Jian
AU - Zhu, Yuntao
AU - Pang, Yutao
AU - Yuan, Xinzhe
AU - Dong, You
AU - Dang, Xinzhi
AU - Xu, Kewen
N1 - Funding Information:
This work is funded by the National Key Research and Development Program of China (2019YFE0112300), National Natural Science Foundation of China (52178135). The supports are gratefully acknowledged.
Publisher Copyright:
© 2023 Institution of Structural Engineers
PY - 2023/4
Y1 - 2023/4
N2 - The system optimization of complex structures is to achieve the overall best behaviour, however, specifications and engineers often pay more attention to the seismic performance of critical components. To comprehensively consider the requirement from theoretical research and practical engineering, a constrained optimization method of seismic mitigation devices for complex structures is proposed in this study, considering the user-defined importance of critical components. The seismic damage probability of individual components is defined as constrained functions (CFs). The overall probabilistic seismic performance of the bridge system is formulated as the objective function (OF) to carry out optimization analysis within the admissible region obtained by CFs. The surrogate functions between the variables and OF/CFs are formulated by the proposed Hazard-related Response Surface Method (H-RSM). A three-dimensional long cable-stayed bridge with a mitigation device of the fluid viscous damper (FVD) is constructed as the case-study model via FEM. Three constrained conditions are imposed by restricting the CFs less than a user-defined threshold to satisfy different safety requirements of the pylon, bearing and FVD. Different protection levels of the pylon are investigated to compare the constrained and unconstrained optimization methods. The influence of the maximum displacement of FVD on the optimal variables is also investigated.
AB - The system optimization of complex structures is to achieve the overall best behaviour, however, specifications and engineers often pay more attention to the seismic performance of critical components. To comprehensively consider the requirement from theoretical research and practical engineering, a constrained optimization method of seismic mitigation devices for complex structures is proposed in this study, considering the user-defined importance of critical components. The seismic damage probability of individual components is defined as constrained functions (CFs). The overall probabilistic seismic performance of the bridge system is formulated as the objective function (OF) to carry out optimization analysis within the admissible region obtained by CFs. The surrogate functions between the variables and OF/CFs are formulated by the proposed Hazard-related Response Surface Method (H-RSM). A three-dimensional long cable-stayed bridge with a mitigation device of the fluid viscous damper (FVD) is constructed as the case-study model via FEM. Three constrained conditions are imposed by restricting the CFs less than a user-defined threshold to satisfy different safety requirements of the pylon, bearing and FVD. Different protection levels of the pylon are investigated to compare the constrained and unconstrained optimization methods. The influence of the maximum displacement of FVD on the optimal variables is also investigated.
KW - Cable-stayed bridges
KW - Constrained optimization
KW - Seismic mitigation devices
KW - Seismic risk
KW - User-defined threshold
UR - http://www.scopus.com/inward/record.url?scp=85149744671&partnerID=8YFLogxK
U2 - 10.1016/j.istruc.2023.02.124
DO - 10.1016/j.istruc.2023.02.124
M3 - Journal article
AN - SCOPUS:85149744671
SN - 2352-0124
VL - 50
SP - 1857
EP - 1867
JO - Structures
JF - Structures
ER -