...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials and structures >Effect of early age drying shrinkage on the seismic response of RC structures
【24h】

Effect of early age drying shrinkage on the seismic response of RC structures

机译：早期干燥收缩对RC结构抗震响应的影响

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

Reinforced concrete (RC) damage over time can cause severe structural problems (e.g. Morandi Bridge in Italy). Many factors contribute to concrete deterioration (thermal conditions, chemical attacks, shrinkage, creep, carbonation, corrosion, etc). Reinforced concrete deterioration starts at early-age and continues with structure aging. Early-age shrinkage, creep and thermal conditions or initial cracks can have a significant impact on the dynamic behavior of concrete structures. The CEOS.fr National program for instance showed that the natural frequency of a RC beam subjected to early-age restrained shrinkage is highly affected. In order to quantify the impact of early-age drying shrinkage on the dynamic behavior of structures, the GEOMAS Lab at INSA Lyon has conducted a research project combining both numerical modeling and pseudo-dynamic tests on two types of RC portal frames. The first one was kept in endogenous conditions (by covering it using a plastic sheet to stop water exchange with the surrounding environment) during its early age period in a way to limit drying effects leading to cracks, while the second one was kept in non-endogenous conditions (water exchange was possible) similar to construction site conditions, which induced cracks apparition. Both RC portal frames were subjected after their early age period to the same seismic loading. The present paper focuses on the experimental part of the project based on the use of pseudodynamic tests in order to evaluate the behavior of such structures under a seismic loading. The portal frames were instrumented using optical fiber sensors, displacement and load sensors and velocimeters. Image correlation was also used in order to monitor the structures.
机译：随着时间的推移，钢筋混凝土（RC）损伤会导致严重的结构问题（例如意大利的Morandi Bridge）。许多因素有助于混凝土劣化（热条件，化学攻击，收缩，蠕变，碳酸，腐蚀等）。钢筋混凝土劣化开始于早期性，并持续衰老。早期收缩，蠕变和热条件或初始裂缝可能对混凝土结构的动态行为产生显着影响。例如，CEOS.FR国家计划表明，经过早期抑制收缩的RC光束的自然频率受到高度影响。为了量化早期干燥收缩对结构动态行为的影响，Insa Lyon的Geomas Lab在两种类型的RC门户框架上结合了数值模拟和伪动态测试的研究项目。第一个在其休眠期间保持内源性条件（通过使用塑料片覆盖它以阻止与周围环境的水交换），以限制导致裂缝的干燥效果，而第二个是非内源性条件（水交换是可能的）类似于施工现场条件，其诱导裂缝幻影。在他们的休眠期后，距离rc门户框架都进行了相同的地震载荷。本文基于使用假实际动力检验来侧重于该项目的实验部分，以便在地震载荷下评估这种结构的行为。门户框架使用光纤传感器，位移和负载传感器和速度计仪进行仪表。还使用图像相关来监视结构。

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