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Development device for prestressing strands in beams.

机译：用于在梁中预应力钢绞线的展开装置。

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摘要

A grouted sleeve device for gripping prestressing steel, developed and tested in previous research by Potter 2009, was embedded into the end regions of prestressed concrete bridge beams in an attempt to anchor the terminal ends of the strands. The goal was to produce enough bond strength in the device to effectively act as a strand anchor and reduce the development length of the strand. Anchored strand could also serve to increase ductility, improve ultimate capacity and reduce the number of stirrups required in the end region.;Four test series were performed, each focusing on separate aspects of the research. Test Series 1 focused on prestress release testing using 0.6-in.-diameter prestressing strand with different steel sleeve sizes and grout types; the results of these tests were used to finalize the anchorage device design. Series 2 incorporated two different designs into the fabrication of two half-scale AASHTO Type II prestressed concrete beams. These beams were fitted with strain gauges for monitoring the transfer length during detensioning. In Series 3, the beams from the previous test series were tested in a shear test configuration to failure, and results were compared to a control specimen. For Series 4, unstressed pull-out specimens were created to test the bond performance of the second anchorage type embedded in a beam of Series 2 and 3.;Finalization of device design and field installation method in Test Series 1 provided a path for the research to take. The transfer length testing that followed established that reducing the transfer length (Lt) in a prestressed beam by means of an embedded anchor was possible. Improvement of the transfer length due to the grouted device is considered negligible after accounting for concrete strength, but the second anchor type (coil confinement) showed a reduction in Lt of 30%. Both types of embedded anchors showed an improvement in ductility and ultimate capacity, but proper end region detailing using shear steel would be beneficial in future tests to more thoroughly test the performance of the anchor.
机译：Potter 2009在先前的研究中开发并测试了一种用于夹持预应力钢的灌浆套筒装置，该装置被嵌入预应力混凝土桥梁的端部区域，以试图锚定钢绞线的末端。目的是在装置中产生足够的粘结强度，以有效地充当股线锚固件并减少股线的展开长度。锚固绞线还可以用于增加延展性，提高极限承载力并减少末端区域所需的箍筋数量。进行了四个测试系列，每个系列都侧重于研究的各个方面。测试系列1的重点是使用直径为0.6英寸的预应力钢绞线（具有不同的钢套筒尺寸和灌浆类型）进行预应力释放测试；这些测试的结果用于最终确定锚固装置的设计。系列2在两种半比例AASHTO II型预应力混凝土梁的制造中采用了两种不同的设计。这些梁装有应变仪，用于监测拉伸过程中的传输长度。在系列3中，将来自先前测试系列的梁在剪切测试配置下进行测试以测试其破坏程度，并将结果与​​对照样本进行比较。对于系列4，创建了无应力的拉出样本以测试嵌入在系列2和3的梁中的第二种锚固类型的粘结性能；完成测试设计1中的设备设计和现场安装方法，为研究提供了途径采取。随后进行的传输长度测试表明，可以通过嵌入的锚来减小预应力梁中的传输长度（Lt）。考虑到混凝土强度后，由于注浆装置而导致的传输长度的改善被认为可以忽略不计，但是第二种锚固类型（盘绕）的Lt降低了30％。两种类型的埋入式锚钉均显示出延展性和极限承载力的改善，但是使用抗剪钢进行适当的端部区域细化将有利于将来进行更彻底地测试锚钉性能的测试。

著录项

  • 作者

    Wagner, David J.;

  • 作者单位

    The Florida State University.;

  • 授予单位 The Florida State University.;
  • 学科 Engineering Civil.
  • 学位 M.S.
  • 年度 2013
  • 页码 136 p.
  • 总页数 136
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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