Pounding Mitigation of Highway Bridges with Shape Memory Alloy Pseudo-rubber
Pounding between adjacent components and structures has become one important cause to make struc tures damage or even collapse under large earthquakes.Shock absorber devices (SAD) are often used to connect the separation gap to reduce the pounding force.However, some shock absorber devices may have residual deformation and need to be repaired or replaced after strong impacts.A novelshock absorber with re sidual deformation seff-recovery ability, martensitic nickel titanium (NiTi) shape memory alloy pseudo-rub ber shock absorber devices (SMAPR-SADs), is fabricated in this study.Then, the mechanical properties of SMAPR-SADs at room temperature were investigated.The results of mechanical tests show that SMAPR-SAD is strain hardening and rate-independent which is suitable for using as shock absorbers.Subsequently, poun ding mitigation analysis of highway bridges with SMAPR-SADs is investigated.A series of shaking table tests on a 1 : 30 scaled steel highway bridge model are performed to investigate the control effects of SMAPR SADs on pounding between adjacent superstructures.Additionally, structural responses and pounding mitiga tion effect are also simulated and analyzed by using the established analytical model and compared with the shaking table test results.Two energy-based efficiency indexes representing energy dissipation abilities of SMAPR-SADs called energy absorption ratio and energy dissipation ratio are also proposed, respectively.Results show that SMAPR-SAD has stable energy absorption ability and could obviously reduce the accelera tions and pounding forces of superstructures by about 90%.
Suchao Li Anxin Guo Chenxi Mao Hui Li
School of Civil Engineering, Harbin Institute of Technology, Harbin, China Institute of Engineering Mechanics, China Earthquake Administration, Harbin, China
国际会议
哈尔滨
英文
580-586
2013-07-06（万方平台首次上网日期，不代表论文的发表时间）