• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Materials Engineering and Performance >Numerical Studies on the Seismic Retrofit of Bridges Using Shape Memory Alloys
【24h】

Numerical Studies on the Seismic Retrofit of Bridges Using Shape Memory Alloys

机译：形状记忆合金桥梁抗震加固的数值研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Recent earthquakes have highlighted the seismic vulnerability of bridges due to excessive movements at the joints (in simply supported deck bridges) or concentration of seismic forces in a few piers (in multi-span continuous deck bridges). Steel-based seismic restrainers and viscous shock transmitters are used to limit the joint openings in simply supported deck bridges or to redistribute the seismic force among all piers in continuous deck bridges, respectively. Currently used devices, however, have some limitations such as large dimensions, no energy dissipation, possible large residual displacements, bad control of the force transmitted to the substructure (steel restrainers), large dimensions, difficulty of installation in existing structures, need of maintenance, and sensitivity to the earthquake characteristics (viscous shock transmitters). Shape memory alloys (SMAs) with superelastic behavior show the potential to overcome the limitations involved in the current technologies. In this article, a multi-performance seismic device based on superelastic SMA wires is proposed for the seismic retrofit of multi-span simply supported and continuous deck bridges. The effectiveness of the SMA devices is assessed through a number of nonlinear time-history analyses on two bridge structures representative of existing Italian highway bridges. Results are compared to the seismic response of the bridges in the as-built configuration.
机译：最近的地震突显了桥梁的地震脆弱性，这是由于节理处的过度运动（在简单支撑的桥面桥梁中）或地震力集中在几个墩台中（在多跨连续桥面桥梁中）。钢制减震器和粘性减震器分别用于限制简单支撑的桥式桥梁的接缝开口或在连续桥式桥梁的所有墩之间重新分配地震力。然而，当前使用的装置具有一些限制，例如大尺寸，无能量耗散，可能的大残余位移，对传递到下部结构（钢制约束器）的力的控制不良，大尺寸，难以安装在现有结构中，需要维护，以及对地震特性的敏感度（粘性冲击变送器）。具有超弹性行为的形状记忆合金（SMA）具有克服现有技术局限性的潜力。本文提出了一种基于超弹性SMA钢丝的多功能抗震装置，用于多跨简支连续桥的抗震改造。通过对代表意大利现有公路桥梁的两座桥梁结构进行多次非线性时程分析，评估了SMA设备的有效性。将结果与建成状态下桥梁的地震响应进行比较。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号