• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Engineers Society of Western Pennsylvania Annual International Bridge Conference; 20070604-06; Pittsburgh,PA(US) >Post fatigue evaluation for existing steel bridges rehabilitation and strengthening
【24h】

Post fatigue evaluation for existing steel bridges rehabilitation and strengthening

机译：现有钢桥修复和加固的疲劳后评估

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

Recently many existing steel bridges were strengthened or retrofitted in order to improve the limit load capacity or extend the service lifespan in China. However, the bridge owners and bridge management departments do not know how the effectiveness of bridge rehabilitation and strengthening or retrofit is. The effective or ineffective rehabilitation and strengthening methods can be investigated by post-evaluation. Therefore, post fatigue evaluation is very necessary for existing steel bridge rehabilitation and strengthening or retrofit in order to make their continued safe use possible while at the same time avoiding unnecessary repairs or replacements. The case study structure, Wubao Yellow River Bridge, a highway continuous steel truss bridge built in 1969 was strengthened by bolted plate in 2003, and the reinforced concrete deck was retrofitted in 2002. In this paper the post fatigue evaluation model of this bridge is presented. In details, the following aspects are investigated: Firstly, the 3-dimensional finite element models for before and after strengthening structures are established through the calibration with the in-situ measured values. Secondly, the traffic situation of the bridge is investigated, and the stress histogram and stress spectrum are simulated by means of the Monte-Carlo Method. Thirdly, the fatigue life and damage of all the vital tension members for before and after strengthening structures is calculated with the fracture mechanics model. Finally, according to the post fatigue life evaluation results the strengthening effectiveness and maintenance strategy are determined.
机译：最近，为了改善极限载荷能力或延长中国的使用寿命，对许多现有的钢桥进行了加固或翻新。但是，桥梁所有者和桥梁管理部门不知道桥梁修复和加固或翻新的效果如何。有效或无效的康复和加强方法可以通过事后评估进行调查。因此，疲劳后评估对于现有的钢桥修复和加固或翻新非常必要，以便使其能够继续安全使用，同时避免不必要的维修或更换。案例研究结构-五宝黄河大桥，于1969年建成的公路连续钢桁桥，于2003年用螺栓板加固，并在2002年进行了钢筋混凝土面板的改造。本文提出了该桥的后疲劳评估模型。 。详细而言，研究了以下方面：首先，通过现场测量值的校准，建立了加固结构前后的三维有限元模型。其次，研究了桥梁的交通状况，并通过蒙特卡洛方法模拟了应力直方图和应力谱。第三，利用断裂力学模型计算了结构加固前后所有重要受拉构件的疲劳寿命和损伤。最后，根据疲劳后寿命评估结果，确定了加固效果和维护策略。

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