曾滨, 许庆, 陈映, 王春林. 空间结构压杆的套管加固失效模式试验研究[J]. 工程力学, 2022, 39(11): 212-221. DOI: 10.6052/j.issn.1000-4750.2021.08.0598
引用本文: 曾滨, 许庆, 陈映, 王春林. 空间结构压杆的套管加固失效模式试验研究[J]. 工程力学, 2022, 39(11): 212-221. DOI: 10.6052/j.issn.1000-4750.2021.08.0598
ZENG Bin, XU Qing, CHEN Ying, WANG Chun-lin. EXPERIMENTAL STUDY ON FAILURE MODES OF COMPRESSION MEMBERS IN SPACE STRUCTURES STRENGTHENED WITH SLEEVES[J]. Engineering Mechanics, 2022, 39(11): 212-221. DOI: 10.6052/j.issn.1000-4750.2021.08.0598
Citation: ZENG Bin, XU Qing, CHEN Ying, WANG Chun-lin. EXPERIMENTAL STUDY ON FAILURE MODES OF COMPRESSION MEMBERS IN SPACE STRUCTURES STRENGTHENED WITH SLEEVES[J]. Engineering Mechanics, 2022, 39(11): 212-221. DOI: 10.6052/j.issn.1000-4750.2021.08.0598

空间结构压杆的套管加固失效模式试验研究

EXPERIMENTAL STUDY ON FAILURE MODES OF COMPRESSION MEMBERS IN SPACE STRUCTURES STRENGTHENED WITH SLEEVES

  • 摘要: 空间结构压杆失稳是结构失效的重要原因之一。利用套管加固空间结构压杆以抑制压杆屈曲,增加构件的极限承载能力和延性。通过对不同壁厚、套管与内压杆间隙和内压杆外伸段长度的12根试件进行轴压试验,得到加固前后试件的极限承载能力、破坏模式和延性变化。加固后试件的极限承载能力最大提高了147%,且外套管壁厚越大,内压杆外伸段越短,承载力越高;内压杆与外套管间隙越大,承载力略有下降。加固试验中构件的破坏模式由加固前的整体屈曲失稳变化为加固后的整体失稳、内压杆端部外伸段失稳和两种耦合失稳,且壁厚越小,易发生整体失稳,外伸段越长,易发生内压杆端部失稳,间隙对失稳形态影响不明显。此外,加固后试件延性均大于未经加固内压杆,经过合理设计延性指标能够增加一倍以上。

     

    Abstract: The Instability of compression members of space structures is one of the important causes of structural failure. The sleeves were applied to reinforce the compression members in space structures to restrain the buckling of the compression members, and to improve the ultimate bearing capacity and the ductility of the components. Thusly, axial compression tests were conducted on 12 specimens to investigate the ultimate bearing capacity, the failure modes and, the ductility of the compression members with and without sleeves. Key parameters include the sleeves thickness, the gap between the inner compression members and sleeves, and the overhang length of the inner compression members. The maximum increment for the ultimate bearing capacity of the specimens after reinforcing was 146%. Besides, the bearing capacity increased with the increase of the sleeves thickness and, with the decrease of the overhang length of the inner compression members. The bearing capacity decreased slightly with the gap between the inner compression members and the sleeves. After reinforcing the compression members, the failure modes of the components changed from the overall instability of the compression members to the coupling instability of compression members and their inner overhangs. Moreover, the overall instability was prone to occur with the decrease of the sleeves thickness. The instability of the overhang of the inner compression members was likely to be observed with the overhang length. The influence of gap on the failure modes was not obvious. In addition, the ductility of all specimens with sleeves is larger than that of the specimens without sleeves, and the ductility index could be more than doubled with reasonable design.

     

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