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(1 南通職業(yè)大學(xué)建筑工程學(xué)院, 南通 226007; 2 同濟(jì)大學(xué)土木工程學(xué)院, 上海 200092;
3 四川省建筑科學(xué)研究院, 成都 610081)
摘要: 設(shè)計(jì)制作了一種新型 H 型鋼削弱裝配式框架節(jié)點(diǎn)(簡稱 SPC 節(jié)點(diǎn))和對應(yīng)相同尺寸的現(xiàn)澆節(jié)點(diǎn),采用低周往復(fù)加載試驗(yàn),研究對比了兩種節(jié)點(diǎn)的抗震性能。 重點(diǎn)分析了節(jié)點(diǎn)的破壞模式、裂縫分布、滯回曲線、骨架曲線、峰值延性、能量耗散系數(shù)、循環(huán)剛度和強(qiáng)度退化、截面彎矩轉(zhuǎn)角、鋼筋應(yīng)變和型鋼應(yīng)變。 結(jié)果表明:SPC 節(jié)點(diǎn)的裂縫分布與現(xiàn)澆節(jié)點(diǎn)相近,但最大裂縫寬度得到有效控制。 SPC 節(jié)點(diǎn)滯回曲線更飽滿,且隨加載位移增加,無明顯剛度退化。 與現(xiàn)澆節(jié)點(diǎn)相比,SPC 節(jié)點(diǎn)的承載力和延性得到顯著改善。 通過兩種節(jié)點(diǎn)能量耗散系數(shù)的對比,結(jié)果表明SPC 節(jié)點(diǎn)具有更好的強(qiáng)震耗能能力。 強(qiáng)度和剛度受循環(huán)加載影響更小,故 SPC 節(jié)點(diǎn)的抗震性能更穩(wěn)定。 SPC 節(jié)點(diǎn)梁端部截面具有更強(qiáng)的彎矩承載力和轉(zhuǎn)動(dòng)能力。 同時(shí),給出的 SPC 節(jié)點(diǎn)設(shè)計(jì)方法,能有效達(dá)成設(shè)計(jì)目標(biāo)和實(shí)現(xiàn)“強(qiáng)柱弱梁”的要求。
關(guān)鍵詞: 裝配式結(jié)構(gòu); 框架節(jié)點(diǎn); 裂縫分布; 抗震性能; 彎矩承載力; 轉(zhuǎn)動(dòng)能力
中圖分類號(hào):TU375 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):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
∗國家自 然 科 學(xué) 基 金 ( 51978525), 江 蘇 高 校 青 藍(lán) 工 程 中 青 年 學(xué) 術(shù) 帶 頭 人 資 助 項(xiàng) 目 ( 2021), 南 通 市 科 技 計(jì) 劃 項(xiàng) 目(MS22020025),南通職業(yè)大學(xué)自然科學(xué)重點(diǎn)課題(2020A?2)。
第一作者:沈華,博士,副教授,主要從事建筑工業(yè)化和工程振動(dòng)控制研究,Email:ntshenhua79@ 163.com。
[引用本文] 沈 華,翁大根,張瑞甫,等. 低周往復(fù)作用下某新型裝配式框架節(jié)點(diǎn)抗震性能試驗(yàn)研究[ J]. 建筑結(jié)構(gòu),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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