单向和双向加载下空间夹心节点抗震性能试验研究

发布时间：2018-04-26 06:38

  本文选题：空间夹心节点 + 低周往复荷载　； 参考：《工程抗震与加固改造》2016年06期

【摘要】：通过单向和双向两种加载方式下空间夹心节点(即核心区采用同梁等强的低强度混凝土浇筑的节点)的低周往复荷载试验,研究了不同加载方式对夹心节点的破坏形式、破坏程度、延性、耗能、刚度退化的影响。结果表明:单向和双向加载方式下,夹心节点的破坏形式以梁纵筋屈服后节点核心区的破坏为主,但双向加载方式下节点的破坏程度更为严重,且延性有所降低;双向荷载的耦合作用降低了节点的抗剪承载力,在设计中仅考虑单方向地震作用是不安全的;两种加载方式对节点耗能性能和刚度退化的影响不明显。
[Abstract]:In this paper, the failure modes of sandwich joints under different loading modes are studied by low-cycle reciprocating load tests of space sandwich joints under unidirectional and bidirectional loading modes (that is, joints with the same beam and other strong low-strength concrete castings) in the core area, and the failure modes of the joints under different loading modes are studied. Damage degree, ductility, energy dissipation and stiffness degradation. The results show that under unidirectional and bidirectional loading mode, the failure mode of sandwich joints is mainly the failure of the core area after the yield of longitudinal tendons, but the failure degree of the joints is more serious and the ductility of the joints decreases under the two-way loading mode. The coupling effect of bidirectional load reduces the shear bearing capacity of joints, and it is not safe to consider only unidirectional seismic action in the design, and the effect of two loading modes on the energy dissipation performance and stiffness degradation of joints is not obvious.
【作者单位】： 中铁建设集团有限公司;北京工业大学工程抗震与结构诊治北京市重点实验室;
【基金】：国家自然科学基金资助项目(51421005)
【分类号】：TU352.11
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本文编号：1804940