• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Bulletin of earthquake engineering >Refinements to the Silvestri's theory for the evaluation of the seismic actions in flat-bottom silos containing grain-like material
【24h】

Refinements to the Silvestri's theory for the evaluation of the seismic actions in flat-bottom silos containing grain-like material

机译：Silvestri理论的改进，用于评估包含颗粒状材料的平底筒仓中的地震作用

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

The seismic behavior of flat-bottom silos containing grain-like material still presents strong uncertainties and current design codes tend to provide too conservative formulations for the estimation of the seismic actions. Over the years, some researchers focused on the dynamic behavior of such silos mainly through numerical investigations. Analytical formulations for the evaluation of the pressures exerted by the ensiled grain on the silo wall under seismic excitation were developed by Younan and Veletsos (J Struct Eng ASCE 124(1):62-70 1998) and, more recently, by Silvestri et al. (Bull Earthq Eng 10(5):1535-1560 2012). Experimental shaking-table tests were performed on silo specimens (Silvestri et al. EESD 2015, submitted), which showed good agreement with the Silvestri's analytical formulations, even if some theoretical limits of validity were not satisfied. This has encouraged a complete revision and refinements of the theoretical framework, which is the object of this paper. In detail, the static and the dynamic actions exchanged between different grain portions and between the grain and the silo wall are idealised in a more physically consistent way. The analytical developments are carried out by means of simple free-body dynamic equilibrium equations. The refinements yield to a significant extension of the theoretical limits of validity and to a new set of analytical formulas for the wall pressures and for the wall shear and bending moment. A comparison of the analytical formulas with (i) the consolidated Janssen (Zeitschrift des vereines deutcher Ingenieure 39:1045-1049 1895) and Koenen (Centralblatt der Bauverwaltung 16:446-449 1896) theory for static design of silos and (ii) with the Eurocode 8 provisions for seismic design of silos and with the experimental results is also performed in order to (i) check the updated theoretical model in static conditions and (ii) verify the reliability of the different formulations in accelerated conditions, respectively. The refined theory confirms that the portion of ensiled material that interacts with the silo wall is significantly smaller than the effective mass suggested by Eurocode 8.
机译：包含颗粒状材料的平底料仓的抗震性能仍然存在很大的不确定性，当前的设计规范倾向于为估算地震作用提供过于保守的公式。多年来，一些研究人员主要通过数值研究来关注这种筒仓的动态行为。由Younan和Veletsos（J Struct Eng ASCE 124（1）：62-70 1998）以及最近由Silvestri等人开发了用于评估地震激发下青贮谷粒对筒仓壁施加压力的分析公式。 。 （Bull Earthq Eng 10（5）：1535-1560 2012）。对筒仓标本进行了实验性振动台测试（Silvestri等人，ESDD，2015年提交），即使不满足某些理论上的有效性限制，也表明与Silvestri的分析公式具有很好的一致性。这鼓励了对理论框架的完整修订和完善，这是本文的目的。详细地，以更物理上一致的方式理想化在不同谷物部分之间以及谷物与筒仓壁之间交换的静态和动态作用。通过简单的自由动力平衡方程进行分析开发。这些改进极大地扩展了理论上的有效性极限，并为壁压力以及壁的剪切和弯矩提供了一套新的解析公式。分析公式与（i）筒仓静态设计的综合Janssen（Zeitschrift des vereines deutcher Ingenieure 39：1045-1049 1895）和Koenen（Centralblatt der Bauverwaltung 16：446-449 1896）理论的比较以及（ii）与还执行了Eurocode 8关于筒仓抗震设计的规定并提供了实验结果，以便（i）在静态条件下检查更新的理论模型，以及（ii）分别在加速条件下验证不同配方的可靠性。完善的理论证实，与仓壁相互作用的青贮材料的部分明显小于欧洲规范8所建议的有效质量。

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