Seismic analysis and parametric study of SDOF lead-rubber bearing (LRB) isolation systems with recentering shape memory alloy (SMA) bending bars

2016 ◽  
Vol 30 (7) ◽  
pp. 2987-2999 ◽  
Author(s):  
Jong Wan Hu
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Parametric Study ◽  
Seismic Analysis ◽  
Rubber Bearing ◽  
Lead Rubber Bearing ◽  
Isolation Systems

scholarly journals Seismic Assessment of a Benchmark Highway Bridge Equipped with Optimized Shape Memory Alloy Wire-Based Isolators

2019 ◽  
Vol 10 (1) ◽  
pp. 141 ◽  
Author(s):  
Reyhaneh Hosseini ◽  
Maria Rashidi ◽  
Farshad Hedayati Dezfuli ◽  
Kamyar Karbasi Arani ◽  
Bijan Samali
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Nonlinear Dynamic Analysis ◽  
Base Shear ◽  
Nsga Ii ◽  
Rubber Bearing ◽  
Lead Rubber Bearing ◽  
Negative Stiffness Device ◽  
Residual Deformations ◽  
Benchmark Highway Bridge

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.

Response of Bridges Isolated by Shape Memory–Alloy Rubber Bearing

2016 ◽  
Vol 21 (3) ◽  
pp. 04015071 ◽  
Author(s):  
Sudib K. Mishra ◽  
Sourav Gur ◽  
Koushik Roy ◽  
Subrata Chakraborty
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Rubber Bearing

Development of an Evaluation Method for Seismic Isolation Systems of Nuclear Power Facilities: Part 6 — Scaled Tests to Obtain Basic Characteristics of Lead Rubber Bearing

2014 ◽  
Author(s):  
Tsutomu Hirotani ◽  
Ryota Takahama ◽  
Masaki Yukawa ◽  
Hiroshi Hibino ◽  
Yuji Aikawa ◽  
...  
Keyword(s):  
Nuclear Power ◽  
Seismic Isolation ◽  
Evaluation Method ◽  
Loading Test ◽  
Rubber Bearing ◽  
Lead Rubber Bearing ◽  
Basic Characteristics ◽  
Isolation Systems ◽  
Seismic Isolation Systems ◽  
Hysteresis Characteristics

This paper provides a series comprising the “Development of Evaluation Method for Seismic Isolation Systems of Nuclear Power Facilities”. Part 6 presents scaled tests for Lead Rubber Bearing (LRB) newly developed for this project. Following tests are performed to obtain the basic characteristics of LRB,. (1) Horizontal and Vertical Simultaneous Loading Test: LRBs with diameter of 250mm are tested dynamically under simultaneous axial and lateral loading. The hysteresis characteristics is not changed under compressive load although it is changed under tensile load. (2) Basic Break Test: LRBs with a diameter of 800mm are tested statically under various combinations of axial and lateral forces. The hysteresis characteristics model of LRB is determined by this test. It is confirmed that the breaking strain of LRB under compression load exceeds 450%. (3) Horizontal Hardening and Vertical Softening Test: For LRBs with a diameter of 1200 mm, 75% scale of actual LRB are tested statically for horizontal hardening and vertical softening regions. It is confirmed that the hysteresis model which is developed by smaller LRBs is applicable to these large scale models.

Control of underground blast induced building vibration by shape-memory-alloy rubber bearing (SMARB)

2017 ◽  
Vol 24 (10) ◽  
pp. e1983 ◽  
Author(s):  
Papiya D. Mondal ◽  
Aparna D. Ghosh ◽  
Subrata Chakraborty
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Rubber Bearing ◽  
Underground Blast
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