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低周往复作用下某新型装配式框架节点抗震性能 试验研究
沈 华1,2 , 翁大根2 , 张瑞甫2 , 葛庆子3 , 王庆华1,2
摘 要

(1 南通职业大学建筑工程学院, 南通 226007; 2 同济大学土木工程学院, 上海 200092;

3 四川省建筑科学研究院, 成都 610081)

摘要: 设计制作了一种新型 H 型钢削弱装配式框架节点(简称 SPC 节点)和对应相同尺寸的现浇节点,采用低周往复加载试验,研究对比了两种节点的抗震性能。 重点分析了节点的破坏模式、裂缝分布、滞回曲线、骨架曲线、峰值延性、能量耗散系数、循环刚度和强度退化、截面弯矩转角、钢筋应变和型钢应变。 结果表明:SPC 节点的裂缝分布与现浇节点相近,但最大裂缝宽度得到有效控制。 SPC 节点滞回曲线更饱满,且随加载位移增加,无明显刚度退化。 与现浇节点相比,SPC 节点的承载力和延性得到显著改善。 通过两种节点能量耗散系数的对比,结果表明SPC 节点具有更好的强震耗能能力。 强度和刚度受循环加载影响更小,故 SPC 节点的抗震性能更稳定。 SPC 节点梁端部截面具有更强的弯矩承载力和转动能力。 同时,给出的 SPC 节点设计方法,能有效达成设计目标和实现“强柱弱梁”的要求。

关键词: 装配式结构; 框架节点; 裂缝分布; 抗震性能; 弯矩承载力; 转动能力

中图分类号:TU375 文献标志码:A 文章编号:1002⁃848X(2022)12⁃0056⁃08

 

DOI:10. 19701 / j. jzjg. 20210943

 

Experimental study on seismic performance of a new type of prefabricated framejoint under low⁃cycle reciprocating action

SHEN Hua1,2, WENG Dagen2, ZHANG Ruifu2, GE Qingzi3, WANG Qinghua1,2

(1 College of Civil Engineering, Nantong Vocational University, Nantong 226007, China; 2 College of Civil Engineering,Tongji University, Shanghai 200092, China; 3 Sichuan Institute of Building Research, Chengdu 610081, China)

Abstract: A new type of H⁃beam weakened prefabricated frame joint (SPC joint) and a cast⁃in⁃place joint corresponding to the same size were designed and fabricated. The seismic performance of the two joints was studied and compared by low⁃cycle reciprocating loading test. The failure mode, crack distribution, hysteresis curve, skeleton curve, peak ductility,energy dissipation coefficient, cyclic stiffness and strength degradation, section bending moment angle, steel bar strain andsection steel strain were analyzed with emphasis. The results show that the crack distribution of the SPC joint is similar tothat of the cast⁃in⁃place joint, but the maximum crack width is effectively controlled. The hysteresis curve of the SPC jointis fuller, and with the increase of loading displacement, there is no obvious stiffness degradation. The bearing capacity andductility of SPC joints are significantly improved compared to cast⁃in⁃place joints. By comparing the energy dissipation coefficients of the two joints, the results show that the SPC joint has better energy dissipation capacity for strongearthquakes. The strength and stiffness are less affected by cyclic loading, so the seismic performance of the SPC joint is more stable. The end section of the SPC joint beam has stronger bending moment bearing capacity and rotational capacity.At the same time, the given SPC joint design method can effectively achieve the design goals and the requirements of "strong columns and weak beams" .

Keywords: prefabricated structure; frame joint; crack distribution; seismic performance; bending moment bearingcapacity; rotational capacity

∗国家自 然 科 学 基 金 ( 51978525), 江 苏 高 校 青 蓝 工 程 中 青 年 学 术 带 头 人 资 助 项 目 ( 2021), 南 通 市 科 技 计 划 项 目(MS22020025),南通职业大学自然科学重点课题(2020A⁃2)。

第一作者:沈华,博士,副教授,主要从事建筑工业化和工程振动控制研究,Email:ntshenhua79@ 163.com。

[引用本文] 沈 华,翁大根,张瑞甫,等. 低周往复作用下某新型装配式框架节点抗震性能试验研究[ J]. 建筑结构,2022,52(12):56⁃63,108. SHEN Hua,WENG Dagen,ZHANG Ruifu,et al. Experimental study on seismic performanceof a new type of prefabricated frame joint under low⁃cycle reciprocating action[ J]. Building Structure,2022,52(12):56⁃63,108.
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