摘要
通过超弹性形状记忆合金(shape memory alloy,简称SMA)拉伸试验研究,建立了SMA四折线本构模型．利用SMA超弹滞回耗能特性．提出一种拉压型SMA阻尼器,并给出其最大输出控制力的计算公式．针对某七跨连续刚构桥,分析了桥梁伸缩缝在无限位器、安装钢棒限位器和安装超弹性SMA阻尼器3种情况下的地震位移．结果表明:安装SMA阻尼器后,伸缩缝处相对位移降低80．3％,中跨跨中水平位移和竖向位移分别降低78．8％和65．9％．因此,SMA阻尼器可以有效控制桥梁结构地震位移,对桥段相对位移的控制效果优于钢棒限位器．
Based on the mechanical experiment of shape memory alloy (SMA) wire, a four-line constitutive relation was achieved. A new SMA passive damper, based on the super-elasticity and energy dissipation, was designed. The equations of output force were also presented. The simulation analysis on seismic response of seven continuous rigid-framed bridges at the three states-without control, with restrainer control, and with SMA dampers control, was carried out. The results show that the peak displacement at expansion joint is reduced by 80. 3%, the peak horizontal displacement and the peak vertical displacement are reduced by 78.8%, 65. 9%. It is verified that this kind of SMA damper can effectively control the seismic displacement of bridge, whose control effect for expansion joint's displacement is better than that of steel restrainer.
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
2006年第z1期94-98,共5页
Journal of Dalian University of Technology
基金
国家杰出青年科学基金资助项目(50425824)
国家自然科学基金资助项目(50178047).
