Tests on Moment Resistant Frame Connection with Replaceable Angles
首先简要回顾前两阶段的研究成果，随后报告了第三阶段的研究工作，即配置可更换连接构造的缩尺钢框架的振动台试验。结果表明：形状与尺寸设计中考虑了塑性变形需求与防止净截面断裂破坏风险后，角钢可以有效吸收地震输入的能量，避免其他构件先行损伤；合理设计的连接构造可以避免混凝土严重开裂或者压溃；当主要构件保持弹性或轻微塑性时，快速更换角钢是可行的；更换角钢后，结构的刚度和承载力可以恢复到初始状态。Abstract: A concept of moment resistant frame structure with beam-to-column connection by replaceable angles that link the flanges of steel beams has been proposed and experimentally studied. It is expected that structural damage shall be concentrated on the angles during expected earthquakes, and the damaged angles can be easily replaced in the rehabilitation process. Meanwhile, the concrete slab above the steel beam shall develop tolerable cracks only, considering the quick recovery of the building function after an earthquake. Experimental research has been carried out with three phases, including connections of bare steel beam in a sub-structural model, connections of steel-concrete beam in a sub-structural model, and dynamic tests on frame structure model.
In this paper, a brief review of the results for the first two phases is presented, a report of the third phase study is followed, i. e., the scaled frame model with the special connection tested on shaking table is reported. The following conclusions can be drawn from the experiment. The angle design about shape and size can guarantee the deformation requirement and avoid the fracture of section, thus the angle can efficiently absorb ground motion energy before the damage of other structural members. Severe cracking or crush of concrete slab can be avoided with properly designed connection details. Quick replacement work is possible when the main structural members keep elastic or experience minor plastic deformation. The structural stiffness and resistance of the repaired frame model may recover to its status as that before damaged.
- structural fuse /
- replaceability /
- moment resistant frame
Cimellaro G P, Reinhorn R M, Bruneau M. Framework for analytical quantification of disaster resilience[J]. Engineering Structures, 2010,32:3639-3649. Calado L, Proenca J M, Espinha M,et al. Hysteretic behaviour of dissipative bolted fuses for earthquake resistant steel frames[J]. Journal of Constructional Steel Research, 2013,85:151-162. Ricles J M, Sause R, Garlock M M,et al. Posttensioned SeismicResistant Connections for Steel Frames[J]. Journal of Structural Engineering, 2001,127(2):113-121. Vargas R, Bruneau M. Experimental response of buildings designed with metallic structural fuses. Ⅱ[J]. Journal of Structural Engineering-ASCE, 2009,135(4):394-403. 贺修樟, 陈以一. 下翼缘组件可更换框架组合梁的设计方法及验证[J]. 建筑结构学报, 2020, 41(3):1-13. Chen Y Y, Shao T F, He X Z. Study on steel H-beams with replaceable energy dissipation angle[C]//Proc. the 8th International Symposium on Steel Structures. Korean Society of Steel Construction, 2015:369-370. 邵铁峰, 陈以一. 采用耗能角钢连接的部件可更换梁试验研究[J]. 建筑结构学报, 2016, 37(7):38-45. He X Z, Chen Y Y, Eatherton M R, et al. Experimental evaluation of a replaceable energy dissipation connection for moment resisting composite steel frames[J]. Journal of Structural Engineering, 2018,144(6). DOI:10. 1061/(ASCE)/ST. 1P43-541X. 0002028.
- 文章访问数: 442
- HTML全文浏览量: 107
- PDF下载量: 32
- 被引次数: 0