• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Geotechnical Special Publication no.129; Geo-Frontiers Conference; 20050124-26; Austin,TX(US) >Flexural Behavior of Drilled Shafts with Minor Flaws
【24h】

Flexural Behavior of Drilled Shafts with Minor Flaws

机译：轻微缺陷的钻杆的抗弯性能

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

Drilled shafts are among the most popular deep foundation solutions because of their cost-effectiveness, their high load-carrying capacity, and the minimal disturbance (vibration, noise) that they cause to the surrounding environment. However, due to the nature of their construction, minor structural flaws are sometimes introduced without the knowledge of the designer. These flaws can consist of small voids, soil inclusions or drilling slurry mixing with concrete; weak concrete; misalignment of steel rebar cages; and corroded rebars. Quality assurance procedures, which include non-destructive evaluation (NDE) techniques, are implemented to ensure that constructed drilled shafts are free of such flaws (particularly voids and soil inclusions). However, these procedures are not always successful, especially for small flaws, and some small flaws unavoidably go undetected. Drilled shafts are often designed to carry lateral loads, for example, drilled shafts in bridge abutments, cantilevered or tied-back retaining walls or bridge and building piers subjected to asymmetric vertical loads or lateral loads from wind, vessel impact or seismic events. Hence, it is important that designers consider the effects of minor, undetectable flaws on the flexural resistance of drilled shafts. This paper presents the results of an experimental study that consisted of scaled laboratory tests and large-scale structural laboratory tests designed to investigate the flexural capacity of drilled shafts with such minor undetectable flaws. The study showed that a concrete void occupying 15 percent of the cross-sectional area of the drilled shaft, penetrating inside the core of the shaft (defined by the rebar cage) and having a length along the centerline of the shaft equal to the diameter of the shaft, may reduce the flexural resistance of the shaft by about 32 percent of the resistance of an intact shaft. The ductility of the shaft due to the presence of an anomaly was also affected. Conclusions concerning loss of capacity and ductility for other flaws are also presented for pure flexural loading.
机译：钻探井具有成本效益，高承载能力以及对周围环境造成的最小干扰（振动，噪音），因此成为最受欢迎的深层基础解决方案之一。然而，由于其构造的性质，有时会在设计者不知情的情况下引入较小的结构缺陷。这些缺陷可能包括小的空隙，土壤夹杂物或与混凝土混合的钻探浆液。弱混凝土钢筋笼的错位；和腐蚀的钢筋。实施质量保证程序，其中包括无损评估（NDE）技术，以确保所构造的钻孔井没有此类缺陷（特别是空隙和土壤夹杂物）。但是，这些过程并不总是成功的，特别是对于小的缺陷，不可避免地会发现一些小的缺陷。钻杆通常被设计成承受侧向载荷，例如，桥基，悬臂或绑扎式挡土墙或桥梁和建筑物墩中的钻杆承受不对称的垂直载荷或来自风，船舶撞击或地震事件的侧向载荷。因此，重要的是，设计人员必须考虑细微的，不可检测的缺陷对钻孔轴抗弯强度的影响。本文介绍了一项实验研究的结果，该实验研究由规模化的实验室测试和大规模的结构化实验室测试组成，旨在研究具有此类细微无法检测的缺陷的钻杆的挠曲能力。研究表明，混凝土空隙占钻杆横截面面积的15％，并渗透到杆身的芯部（由钢筋笼限定）内，沿杆身中心线的长度等于直径的直径。轴的弯曲阻力可减少完整轴阻力的32％。由于异常的存在，轴的延展性也受到影响。对于纯弯曲载荷，还提出了有关其他缺陷的能力和延展性损失的结论。

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