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Cyclic loading test of steel coupling beams with mid-span friction dampers and RC slabs

机译：带有中跨摩擦阻尼器和RC平板的钢连接梁的循环荷载试验

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摘要

In coupled wall systems, coupling beams distributed along the structural height are intended to yield and dissipate seismic energy under moderate and severe earthquakes. The use of specifically designed dampers in coupling beams can greatly enhance the seismic performance of a structure. In the present study, a friction damper incorporating brake pad-to-mild steel friction interfaces is proposed for installation in a steel coupling beam at the mid-span. Cyclic loading tests were conducted on the friction coupons and subassemblages of steel coupling beams with mid-span friction dampers. An RC slab, which rested on the top flange of the steel coupling beam without shear connectors, was included in one of the subassemblage specimens. The test results show that the friction dampers exhibited stable and full hysteretic responses with up to 8% chord rotation of the coupling beams. The friction coefficients were gradually increased and the clamping forces of the dampers relaxed during the cyclic loading. The average friction coefficient was close to the nominal value with a small deviation. However, the unintended out-of-plane bending of the steel teeth of the friction dampers reduced the effective normal force on the friction interfaces and, thus, led to a lower-than-expected shear strength of the damper. Though not composited with the steel coupling beam, the RC slab sustained severe flexural cracks as wide as 6 mm at 4% chord rotation of the coupling beam and, thus, might influence the postquake recovery of a building. A simple numerical model was established to investigate the respective contribution of each part of the coupling beam. The results show that the post-sliding stiffness introduced by the RC slab was less than 1% of the initial stiffness of the coupling beam and decreased rapidly with increasing deformation amplitudes. The shear force in the slab exceeded 10% of the strength of the friction damper at 4% chord rotation and is deemed to be a potential source of overstrength for the design of a coupling beam and the surrounding elements.
机译：在耦合墙系统中，沿结构高度分布的耦合梁旨在在中等和严重地震下产生并消散地震能量。在耦合梁中使用专门设计的阻尼器可以大大提高结构的抗震性能。在本研究中，提出了一种将制动衬块与低碳钢摩擦界面结合在一起的摩擦阻尼器，用于安装在中跨的钢制连接梁中。对带有中跨摩擦阻尼器的钢制耦合梁的摩擦片和组件进行了循环载荷测试。 RC平板，不带剪切连接器，搁置在钢制连接梁的顶部凸缘上，被包含在一个子组合件样本中。测试结果表明，摩擦阻尼器在耦合梁的弦旋转高达8％的情况下表现出稳定而完整的滞后响应。在循环加载过程中，摩擦系数逐渐增加，阻尼器的夹紧力得到了缓解。平均摩擦系数接近标称值，偏差很小。然而，摩擦阻尼器的钢齿的意外平面外弯曲减小了在摩擦界面上的有效法向力，因此导致阻尼器的剪切强度低于预期。尽管未与钢制连接梁组合，但RC平板在连接梁弦旋转4％时仍承受着6 mm的严重挠曲裂纹，因此可能会影响建筑物的震后恢复。建立了一个简单的数值模型来研究耦合梁各部分的各自贡献。结果表明，RC平板引入的滑动后刚度小于耦合梁初始刚度的1％，并且随着变形幅度的增加而迅速降低。弦板旋转4％时，平板中的剪切力超过了摩擦阻尼器强度的10％，被认为是设计连接梁和周围元件时潜在的超强度源。

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  • 来源
    《Engineering Structures》 |2020年第15期|109876.1-109876.13|共13页
  • 作者

    Qu Zhe; Ji Xiaodong; Shi Xiao; Wang Yandong; Liu Hanquan;

  • 作者单位

    CEA Inst Engn Mech Key Lab Earthquake Engn & Engn Vibrat Sanhe 065201 Hebei Peoples R China;

    Tsinghua Univ Dept Civil Engn China Educ Minist Key Lab Civil Engn Safety & Durabil Beijing 100084 Peoples R China;

    State Grid Sichuan Elect Power Co Chengdu 610041 Sichuan Peoples R China;

    Kyoto Univ Dept Architecture & Architectural Engn Kyoto Japan;

    China Earthquake Adm Inst Engn Mech Sanhe 065201 Hebei Peoples R China;

  • 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
  • 中图分类
  • 关键词

    Steel coupling beam; Friction damper; Reinforced concrete slab; Friction coefficient; Initial stiffness;

    机译：钢制连接梁;摩擦阻尼器;钢筋混凝土板;摩擦系数;初始刚度;

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