• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Structural behaviour and design criteria of under-deck cable-stayed bridges subjected to seismic action
【24h】

Structural behaviour and design criteria of under-deck cable-stayed bridges subjected to seismic action

机译：地震作用下桥面斜拉桥的结构特性和设计标准

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

Under-deck cable-stayed bridges are very effective structural systems for which the strong contribution of the stay cables under live loading allows for the design of very slender decks for persistent and transient loading scenarios. Their behaviour when subjected to seismic excitation is investigated herein and a set of design criteria are presented that relate to the type and arrangement of bearings, the number and configuration of struts, and the transverse distribution of stay cables. The nonlinear behaviour of these bridges when subject to both near-field and far-field accelerograms has been thoroughly investigated through the use of incremental dynamic analyses. An intensity measure that reflects the pertinent contributions to response when several vibration modes are activated was proposed and is shown to be effective for the analysis of this structural type. The under-deck cable-stay system contributes in a very positive manner to reducing the response when the bridges are subject to very strong seismic excitation. For such scenarios, the reduction in the stiffness of the deck because of crack formation, when prestressed concrete decks are used, mobilises the cable system and enhances the overall performance of the system. Sets of natural accelerograms that are compliant with the prescriptions of Eurocode 8 were also applied to propose a set of design criteria for this bridge type in areas prone to earthquakes. Particular attention is given to outlining the optimal strategies for the deployment of bearings.
机译：甲板下斜拉桥是非常有效的结构系统，在实时荷载作用下，斜拉索的强力作用使得其可以设计非常细长的桥面，以应对持续荷载和瞬态荷载。本文研究了它们在受到地震激励时的行为，并提出了一组设计准则，这些准则与轴承的类型和布置，支柱的数量和配置以及斜拉索的横向分布有关。通过使用增量动态分析，已经彻底研究了这些桥梁在受到近场和远场加速度影响时的非线性行为。提出了一种强度度量，该强度度量反映了当激活多个振动模式时响应的相关贡献，并被证明对这种结构类型的分析有效。当桥梁受到非常强烈的地震激励时，甲板下的斜拉系统以非常积极的方式有助于降低响应。对于这种情况，当使用预应力混凝土甲板时，由于裂缝的形成而导致的甲板刚度的降低会动员电缆系统并增强系统的整体性能。还使用了符合Eurocode 8规定的一组自然加速度图，以针对易地震地区的这种桥梁类型提出一套设计标准。特别注意概述轴承部署的最佳策略。

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