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首页> 外文期刊>Engineering Structures >A new displacement-based approach for pulsating tension load tests of post-installed anchors for the use in structural applications under seismic actions
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A new displacement-based approach for pulsating tension load tests of post-installed anchors for the use in structural applications under seismic actions

机译：一种新的位移方法，用于脉动后安装锚定的张力载荷试验，用于在地震动作下的结构应用中的应用

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摘要

The usage of post-installed anchors in structural applications and seismic retrofit solutions has become more and more popular over the past decades. The current approaches for seismic assessment of post-installed anchors follow primarily a force-based approach and were developed focusing on non-structural applications. On the structural level, performance based approach is becoming increasingly popular and important for the seismic design of structures as well as for seismic retrofitting of structures. This approach targets on the performance objectives that are closely related to the displacement behavior rather than on specific load levels to allow a better balance between construction costs and safety of structures. This performance based approach is also reflected in recent guidelines for seismic testing of reinforced concrete (RC) structural components. Yet in anchor design and qualification, the main focus is on force-based test and assessment methods. Such force-controlled assessment procedures may not provide sufficient information required to assess the performance of anchorages in structural applications where anchorages are subjected to strong demands and might be pushed beyond their linear behavior range. In this paper, a new displacement-based approach for testing of post-installed anchors under seismic actions is introduced. With this new approach, it is possible to obtain the complete hysteretic behavior over the entire range of the load-displacement response. The test setup, cyclic test protocol and typical results of the tests performed on five different post-installed anchor types are described and discussed in the paper. The anchors are tested under pulsating tension loads following (i) the force-controlled protocol specified by the existing qualification guidelines, and (ii) the new displacement-controlled protocol recommended in this work, and the results of the tests are compared. The results of the tests following the displacement-controlled protocol are found to be more suitable for the assessment of anchors used in structural strengthening applications under seismic actions due to their ability to provide the full information required for characterization of the anchors under seismic loads. The proposed approach holds promise to replace/augment the current testing procedures for seismic assessment of post-installed anchors. Based on the evaluation of the experimental results new assessment conditions are being developed for the assessment of post-installed anchors under seismic actions that will be presented by the authors in a future paper.
机译：在过去几十年中，结构应用和地震改造解决方案的安装后锚点的使用变得越来越受欢迎。安装后锚的目前的地震评估方法主要是一种基于力的方法，并开发了关注非结构应用。在结构层面上，基于性能的方法对于结构的地震设计以及结构的地震改造变得越来越受欢迎和重要。这种方法对与位移行为密切相关的性能目标，而不是特定的负载水平，以便在建筑成本和结构安全之间进行更好的平衡。基于性能的方法也反映在钢筋混凝土（RC）结构部件的地震检测准则中反映。然而，在锚设计和资格中，主要重点是基于力的测试和评估方法。这种力量控制的评估程序可能无法提供评估锚固在锚固遭受强烈需求的结构应用中的锚固性能所需的足够信息，并且可能会超出其线性行为范围。本文介绍了一种新的基于位移的用于测试地震作用下的安装后锚定的方法。利用这种新方法，可以在负载 - 位移响应的整个范围内获得完整的滞后行为。在纸纸中描述和讨论在五种不同的安装后锚定类型上进行的测试设置，循环试验协议和典型结果。在（i）由现有资格指南规定的力控制协议之后，锚固锚在脉动张力载荷下进行测试，并进行了（ii）该工作中推荐的新位移控制协议，并比较了测试结果。发现位移控制方案之后的测试结果更适合于评估结构强化应用在地震行动下的结构，这是由于它们提供了在地震载荷下表征锚固件所需的全部信息。拟议的方法持有替换/增强当前测试程序的后安装后锚点。基于对实验结果的评估，正在开发新的评估条件，以评估在未来纸张中的地震行动下的后安装锚点。

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