传统桥墩支座缺乏抗大载荷（车辆撞击、爆炸、地震等）冲击的能力，是桥梁结构安全体系中最薄弱环节。本课题提出一种新型智能复合式桥墩支座-阻尼系统，该系统用可变刚度的磁流变弹性材料做支座主体调节结构强度和共振频率，以可调阻尼的磁流变脂器件抑制墩梁移位，可在有限范围内缓减墩梁结构的冲击载荷并达到减灾防护的效果。通过对磁流变智能材料单元瞬态磁力微尺度建模和梁-支座-墩冲击振动传递的宏观尺度建模的研究，在不定力和磁场的耦合下揭示支座系统刚度阻尼可调的缓冲隔振机理，探索失效安全与能耗降低的机械与磁路结构优化设计原理，研制适合于该系统的新型磁流变弹性体和磁流变脂智能材料,基于无量纲理论提出小尺度复合式桥墩支座-阻尼系统的设计方法。利用仿真与小尺度台架实验结合，验证与评估该新型支座-阻尼系统抗冲与隔振的效果。该课题的成功完成，可望为我国发展抗冲击载荷破坏的先进桥梁缓冲隔振装置提供理论探索和技术储备。

Conventional bridge pier bearing is lack of capabilities in preventing bridge from large shock impacts such as vehicle hammerblow, blast, earthquake, etc. It is the weakest link in the bridge security system.In this project, a new smart assembled pier bearing-damping system is proposed to improve the performance and enhance the capability of bridge pier-deck structure for buffering reduction in a certain lever. This system consists of a magneto-rheological (MR) elastomer bearing and an MR grease damper. The former with variable stiffness as the main body of bearing can adjust structure intensity and resonance frequency during impact loadings, and the latter with variable damping is used to suppress pier-deck displacement.A micromechanical model considering transient magnetic forces in a unit volume of MR material will be proposed and studied in the project. And a macroscopic model considering shock and vibration dynamics of the bridge pier-MR bearing-deck system will be studied as well. The mechanism of this assembled bearing system for shock and vibration isolation will be addressed based on coupling uncertain force and magnetic field. A fail safe and optimization design principle for mechanical and magnetic structure with small energy consume are also discussed. A new MR materials including MR elastomer and MR grease which are suitable for this assembled bearing -damping device will be developed. A design methodology for this new small scale bridge bearing-damping system is proposed based on a dimensionless analysis theory.At last, simulations and lab experiments are combined to validate and evaluate its performance.The results of this proposal could afford theory preparation and technology support for developing advanced shock and vibration isolation equipment of bridge pier-deck to defense uncertain large destroying loads.