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Experimental investigation on the seismic behaviour of innovative self-centring precast steel-concrete hybrid frames

机译：创新自定心预制钢混凝土混合框架抗震性能的实验研究

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摘要

An innovative self-centring precast steel-concrete hybrid (SPH) frame was proposed. The proposed SPH frame was assembled with reinforced concrete (RC) columns and prefabricated steel-concrete hybrid (PH) beams using steel end plates and high-strength bolts. The RC columns consisted of a traditional RC section and an unbonded post-tensioned (PT) screw-thread steel (STS) bar, and the PH beam was composed of two steel beam ends, a prefabricated RC beam unit and four unbonded PT strands. The self-centring ability of the structure system was mainly provided by the PT steel reinforcements; the energy dissipation capacity was mainly provided by the bolted web friction devices (WFDs) applied to the beam and the plastic deformation of the steel beam ends. To examine the seismic behaviour of this innovative structural system, cyclic tests were conducted on two SPH frames and one non-prestressed precast steel-concrete hybrid (NPH) frame. By analysing failure modes, hysteretic loops, skeleton curves, energy dissipation, displacement ductility ratios, stiffness degradation and the relative self-centring efficiency (RSE), the effects of the initial prestress, the pretorque of the high-strength bolts at the WFDs and the construction measure at the column base were thoroughly assessed. The test results indicated that the proposed noncontact oil jack prestressing technique used in the PH beams was reliable; during the testing process, gap opening and closing could be clearly observed at the interfaces between the RC beam unit and the steel beam end; the SPH frames exhibited better self-centring and energy consumption capabilities than the NPH frame; and the SPH frame exhibited a typical two-stage cyclic behaviour, namely, a self-centring stage and an energy consumption stage. In the self-centring stage (before the drift ratio of 2.0%), the SPH frame could effectively control residual deformation, and the RSE remained at approximately 85%; in the energy consumption stage (after the drift ratio of 2.0%), the SPH frame could effectively consume the absorbed energy. Based on the test results, a moment calculation method, which could distinguish the gap opening in the PH beam, was proposed, and the calculated results agreed well with the experimental results.
机译：提出了一种创新的自定心预制钢混凝土杂交（SPH）框架。采用钢端板和高强度螺栓，采用钢筋混凝土（RC）柱和预制的钢混凝土杂交（PH）梁组装了所提出的SPH框架。 RC列由传统的RC部分和未粘附的后张紧（PT）螺纹钢（STS）杆组成，并且PH光束由两个钢梁端部组成，预制的RC梁单元和四个未粘合的PT股线组成。结构系统的自定心能力主要由PT钢筋增强剂提供;能量耗散能力主要由施加到光束的螺栓卷绕卷绕装置（WFD）提供，并且钢梁的塑性变形末端。为了检查这种创新结构系统的地震行为，在两个SPH框架和一个非预应力的预制钢混凝土杂交（NPH）框架上进行循环试验。通过分析故障模式，滞回环，骨架曲线，能量耗散，位移延伸比，刚度降解和相对自定心效率（RSE），初始预应力的效果，WFDS的高强度螺栓的比例彻底评估柱碱的结构措施。测试结果表明，在PH光束中使用的建议的非接触式油插孔预应力技术可靠;在测试过程中，可以在RC光束单元和钢梁端之间的界面处清楚地观察间隙打开和关闭; SPH框架表现出比NPH框架更好的自定心和能量消耗能力;并且SPH框架表现出典型的两级循环行为，即自定心阶段和能量消耗阶段。在自定心阶段（在漂移比为2.0％之前），SPH框架可以有效地控制残留变形，并且RSE保持在约85％;在能量消耗阶段（在漂移比为2.0％之后），SPH框架可以有效地消耗吸收的能量。基于测试结果，提出了一种可以区分pH光束中的间隙开口的时刻计算方法，并且计算结果与实验结果很好。

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  • 来源
    《Engineering Structures》 |2021年第15期|112222.1-112222.17|共17页
  • 作者

    Yang Yong; Feng Shiqiang; Xue Yicong; Yu Yunlong;

  • 作者单位

    Xian Univ Architecture & Technol Sch Civil Engn Xian 710055 Shaanxi Peoples R China|Xian Univ Architecture & Technol Minist Educ Key Lab Struct Engn & Earthquake Resistance Xian 710055 Shaanxi Peoples R China;

    Xian Univ Architecture & Technol Sch Civil Engn Xian 710055 Shaanxi Peoples R China;

    Xian Univ Architecture & Technol Sch Civil Engn Xian 710055 Shaanxi Peoples R China;

    Xian Univ Architecture & Technol Sch Civil Engn Xian 710055 Shaanxi Peoples R China|Xian Univ Architecture & Technol Minist Educ Key Lab Struct Engn & Earthquake Resistance Xian 710055 Shaanxi 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

    Self-centring structure; Steel and concrete hybrid frame; Web friction device (WFD); Seismic behaviour; Experimental study;

    机译：自定心结构;钢和混凝土混合框架;卷筒纸摩擦装置（WFD）;地震行为;实验研究;

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