A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Seismic assessment of a benchmark highway bridge equipped with optimized shape memory alloy wire-based isolators
In this paper, an evolutionary multi-objective optimization algorithm named NSGA-II was used to determine the optimum radius for shape memory alloy (SMA) wires employed in conjunction with the lead rubber bearing (LRB), referred to as an SMA-LRB isolator. This algorithm simultaneously minimizes the mid-span displacement and the base shear force. Then, the optimized SMA-LRBs were implemented in a benchmark bridge to reduce excessive displacements. The results obtained from the nonlinear dynamic analysis show that the implemented approach could effectively optimize the SMA-LRBs. These improved smart isolators can noticeably reduce the maximum displacements and residual deformations of the structure; meanwhile, the base shear and deck acceleration remain less than those of the non-isolated benchmark bridge. This isolator can reduce the maximum mid-span displacement of the bridge by up to 61%, and the mid-span residual deformations by up to 100%, compared to an uncontrolled isolated bridge under different ground motions. This optimized passive system was compared with nonlinear dampers, passive SMA dampers, and a negative stiffness device. The results indicate that the optimized SMA-LRB isolators are generally more successful in reducing and recovering displacements than the other controllers.
Seismic assessment of a benchmark highway bridge equipped with optimized shape memory alloy wire-based isolators
In this paper, an evolutionary multi-objective optimization algorithm named NSGA-II was used to determine the optimum radius for shape memory alloy (SMA) wires employed in conjunction with the lead rubber bearing (LRB), referred to as an SMA-LRB isolator. This algorithm simultaneously minimizes the mid-span displacement and the base shear force. Then, the optimized SMA-LRBs were implemented in a benchmark bridge to reduce excessive displacements. The results obtained from the nonlinear dynamic analysis show that the implemented approach could effectively optimize the SMA-LRBs. These improved smart isolators can noticeably reduce the maximum displacements and residual deformations of the structure; meanwhile, the base shear and deck acceleration remain less than those of the non-isolated benchmark bridge. This isolator can reduce the maximum mid-span displacement of the bridge by up to 61%, and the mid-span residual deformations by up to 100%, compared to an uncontrolled isolated bridge under different ground motions. This optimized passive system was compared with nonlinear dampers, passive SMA dampers, and a negative stiffness device. The results indicate that the optimized SMA-LRB isolators are generally more successful in reducing and recovering displacements than the other controllers.
Seismic assessment of a benchmark highway bridge equipped with optimized shape memory alloy wire-based isolators
Hosseini, Reyhaneh (R20179) (author) / Rashidi, Maria (R18339) (author) / Hedayati Dezfuli, Farshad (author) / Karbasi Arani, Kamyar (R20178) (author) / Samali, Bijan (R17646) (author) / Institute for Infrastructure Engineering (Host institution)
2020-01-01
Applied Sciences--2076-3417 Vol. 10 Issue. 1 No. 141
Article (Journal)
Electronic Resource
English
Seismic Resilience Assessment of Highway Bridges Equipped with Shape Memory Alloy Isolation Bearings
| Springer Verlag | 2024
Incremental Dynamic Analysis of Highway Bridges with Novel Shape Memory Alloy Isolators
| Online Contents | 2014
Incremental Dynamic Analysis of Highway Bridges with Novel Shape Memory Alloy Isolators
| British Library Conference Proceedings | 2014
Incremental Dynamic Analysis of Highway Bridges with Novel Shape Memory Alloy Isolators
| SAGE Publications | 2014