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首页> 外文期刊>Magazine of Concrete Research >Stiffness reduction factor for post-tensioned flat plate slabs
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Stiffness reduction factor for post-tensioned flat plate slabs

机译：后张平板的刚度减小系数

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摘要

The effective beam width model (EBWM) has been used for estimating force and drift demands on flat plate frames under lateral loads. The accuracy of this model depends strongly on how to estimate the effective stiffness of flat plate slabs. With an increase in slab moments due to lateral loads, slab cracks occur and propagate on the slab, which leads to a reduction in slab flexural stiffness. For post-tensioned (PT) flat plate slabs, the initiation and propagation of slab cracks can be delayed due to slab in-plane compressive stress induced by PT tendon forces. This study investigates the contribution of slab in-plane compressive stress to the slab stiffness reduction factor, which is defined as the ratio of slab stiffness obtained from a cracked slab section to that from the corresponding uncracked slab section. For this purpose, this study collected the test results of PT flat plate slab-column connection specimens and estimated the slab stiffness reduction factors (β) for those specimens with respect to a level of applied slab moment. Non-linear regression analysis is used to propose an empirical equation computing β for PT flat plate slabs using β estimated from the test results. The accuracy of the empirical equation for β is verified by comparing the lateral stiffness of a two-storey PT flat plate frame, obtained using the EBWM with the empirical equations for β, with that estimated from shaking table test results on the frame.
机译：有效梁宽度模型（EBWM）已用于估算在横向载荷下平板框架上的力和漂移需求。该模型的准确性在很大程度上取决于如何估算平板的有效刚度。随着由于侧向载荷而引起的板力矩的增加，板裂缝出现并在板上传播，这导致板的抗弯刚度降低。对于后张（PT）平板平板，由于PT肌腱力引起的平板内平面压缩应力，平板裂纹的萌生和传播可能会延迟。本研究调查了板坯面内压缩应力对板坯刚度减小因子的贡献，该系数定义为从开裂的板坯截面获得的板坯刚度与从相应的未开裂的板坯截面获得的板坯刚度之比。为此，本研究收集了PT平板板-柱连接试样的测试结果，并根据施加的板矩确定了这些试样的板刚度降低系数（β）。非线性回归分析用于提出经验公式，该经验公式使用从测试结果估计的β来计算PT平板的β。通过将使用EBWM获得的两层PT平板框架的侧向刚度与β的经验公式进行比较，并根据在框架上的振动台测试结果估算出的准确性，可以验证β的经验公式的准确性。

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  • 来源
    《Magazine of Concrete Research》 |2012年第1期|p.83-92|共10页
  • 作者

    Young Mi Park; Sang Whan Han; Youn Ho Rew;

  • 作者单位

    Department of Architectural Engineering, Hanyang University, Seoul, Korea;

    Department of Architectural Engineering, Hanyang University, Seoul, Korea;

    Department of Architectural Engineering, Hanyang University, Seoul, Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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