• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>ACI convention >SEISMIC STABILITY OF MARINE PIERS BUILT WITH PRESTRESSED CONCRETE PILES
【24h】

SEISMIC STABILITY OF MARINE PIERS BUILT WITH PRESTRESSED CONCRETE PILES

机译：预应力混凝土桩加固海底桩的地震稳定性

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This study was conducted to examine the seismic behavior of piers built on prestressed concrete piles founded in dense sand with grouted dowel bar connections. The following key observations were made. (1) The ground motions that caused collapse typically had a displacement pulse or fling in the record. These characteristics were particularly harmful to longer period, more flexible piers. (2) In general connection and in-ground steel demands were low; with few cases experiencing steel strains larger than 0.03. This indicates that sway instability due to P-A effects is the most common cause of collapse for piers. (3) A stability index limit of 0.25 provides sufficient protection against dynamic collapse when P-A effects are ignored in the analysis for piers supported on prestressed concrete pile, while a stability index limit of 0.1 will protect against significant P-A displacement amplification variability when increased analytical accuracy is desired. (4) For typical pile lengths and axial loading the P-A sensitive behavior is expected and the stability index limit will likely control the displacement capacities over material strain limits. Finally a simple procedure was proposed to help identify when a pier is potentially at risk from instability due to dowel bar fracture.
机译：进行这项研究是为了检查在预应力混凝土桩上建造的墩的抗震性能，该桩在密实的沙子中建立，并用灌浆的销钉连接。进行了以下主要观察。 （1）引起坍塌的地震动通常在记录中具有位移脉冲或甩动。这些特征对于较长时间，更灵活的墩墩特别有害。 （2）总体而言，对地下钢的需求较低;少数情况下会承受大于0.03的钢应变。这表明，由于P-A效应而引起的摇摆不稳定性是桥墩坍塌的最常见原因。 （3）如果在分析预应力混凝土桩支撑的墩时忽略了PA效应，则稳定指数限值0.25可以提供足够的抗动态坍塌保护，而当提高分析精度时，稳定指数极限值为0.1可以防止显着的PA位移放大变化。是理想的。 （4）对于典型的桩长和轴向载荷，预计会出现P-A敏感行为，而稳定性指标极限可能会控制位移能力超过材料应变极限。最后，提出了一个简单的程序来帮助确定何时由于销钉断裂而导致墩墩可能面临不稳定的危险。

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