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Evaluation of real performance of reinforced concrete cantilevered balcony structures using forced-vibration technique.

机译：使用强迫振动技术评估钢筋混凝土悬臂阳台结构的真实性能。

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摘要

This thesis reports an experimental investigation/evaluation to enrich our existing understanding of the real performance of reinforced concrete cantilevered balcony structures (RCCBS) through investigating the inter-relationships amongst the so called 'balcony parameters' (expressed in terms of dynamic, structural and material properties). It details an experimental approach of investigating/evaluating the 'real' performance of RCCBS and the efforts in the establishment of a performance-based phenomenological model, called 'unified structural performance' (USP) model, using forced-vibration measurement technique. To reveal the 'real' performance of the RCCBS, the contribution and the constitutive effects to the global stiffness of structure arising from tensile capacity of concrete (TCC) has been a subject of intensive investigation in this study.;A series of experimental programmes have been carried out using three different RCCBS models each differs one another by the structural characteristics and loading conditions to obtain different trajectories for the establishment of the USP model. These RCCBS models were made to deteriorate artificially by a novel damage strategy (by cutting off the tensile steel rebars at predetermined step sizes). With this technique, the severity of damage to the structure and the corresponding changes of structural and material properties could be measured/quantified accurately without the need of imposing additional loads on the tested structure.;By assembling a set of trajectories for the individual balcony parameters of the two full-scale RCCBS models, the USP model was established to cover two different performance regimes of RCCBS. With this USP model, the real performance of RCCBS can be evaluated by charting the resonant frequency measured from the tested structure to their rightful positions corresponding to the two performance regimes governed by different ranges of TCC. Verification of the validity and usefulness of the USP model was further undertaken using data measured from a number of real-life balconies.;It is also believed that the USP model and the experimental technique proposed and advocated in this research have already provided fundamental and indispensable understanding of the real performance of RCCBS and the role of TCC in these kinds of structure. Thus it will enable us to apply such understanding to other RC structures/elements.
机译：本论文报告了一项实验研究/评估，旨在通过研究所谓的“阳台参数”（以动力，结构和材料形式表示）之间的相互关系，来丰富我们对钢筋混凝土悬臂阳台结构（RCCBS）真实性能的现有理解。属性）。它详细介绍了一种研究/评估RCCBS的“真实”性能的实验方法，以及使用强制振动测量技术建立基于性能的现象学模型（称为“统一结构性能”（USP）模型）的努力。为了揭示RCCBS的“真实”性能，混凝土抗拉强度（TCC）对结构整体刚度的贡献和本构作用已成为本研究的重点研究课题。使用三种不同的RCCBS模型进行的试验，每种模型在结构特征和载荷条件上都各不相同，从而获得了建立USP模型的不同轨迹。这些RCCBS模型是通过一种新颖的损坏策略（通过以预定步长大小切断抗拉钢筋）来人为恶化的。通过这种技术，可以准确地测量/量化对结构破坏的严重程度以及相应的结构和材料特性的变化，而无需在测试的结构上施加额外的载荷。;通过为各个阳台参数组装一组轨迹在两个完整的RCCBS模型中，USP模型的建立涵盖了RCCBS的两个不同的性能体系。使用此USP模型，可以通过绘制从被测结构测得的共振频率到它们对应于受不同TCC范围控制的两种性能状态的正确位置的图表，来评估RCCBS的实际性能。 USP模型的有效性和实用性还通过使用从许多实际阳台上获得的数据进行了验证。;也有人认为，本研究中提出和倡导的USP模型和实验技术已经提供了基本且必不可少的了解RCCBS的实际性能以及TCC在此类结构中的作用。因此，这将使我们能够将此类理解应用于其他RC结构/元素。

著录项

  • 作者

    Chu, Louis Yiu-Leung.;

  • 作者单位

    Hong Kong Polytechnic University (Hong Kong).;

  • 授予单位 Hong Kong Polytechnic University (Hong Kong).;
  • 学科 Engineering Architectural.
  • 学位 Ph.D.
  • 年度 2011
  • 页码 352 p.
  • 总页数 352
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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