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(1 河北工業(yè)大學(xué)土木與交通學(xué)院, 天津 300401; 2 中國建筑一局 (集團(tuán)) 有限公司, 北京 102600)
摘要: 基于復(fù)式鋼管混凝土雙層鋼管的截面特點(diǎn),設(shè)計了單邊螺栓-T 形件連接節(jié)點(diǎn),并對 5 個單邊螺栓-T 形件連接節(jié)點(diǎn)和 1 個穿芯螺栓-T 形件連接節(jié)點(diǎn)進(jìn)行了低周往復(fù)荷載試驗. 通過數(shù)字散斑相關(guān)方法(DSCM)得到了試件的彎矩-轉(zhuǎn)角變化關(guān)系曲線. 結(jié)果表明:試件滯回曲線均呈飽滿 Z 形,節(jié)點(diǎn)破壞形態(tài)為 T 形件翼緣屈服后鋼梁塑性變形,T 形件因不同的加肋方式出現(xiàn)了三種變形特征. 除了 T 形件翼緣厚度較薄且未加肋的試件為部分強(qiáng)度半剛性節(jié)點(diǎn)外,其余節(jié)點(diǎn)試件均為全強(qiáng)度半剛性節(jié)點(diǎn);加肋 T 形件節(jié)點(diǎn)比無肋試件極限承載力提高了 30%,但延性明顯降低;對比穿芯螺栓-T 形件連接節(jié)點(diǎn),單邊螺栓栓-T 形件連接節(jié)點(diǎn)初始剛度略低、承載力相當(dāng),但變形能力明顯提高,滯回性能得到改善;往復(fù)荷載下單邊螺栓-T 形件連接節(jié)點(diǎn)為拉壓交替式工作,受拉螺栓能夠得到較強(qiáng)的錨固連接強(qiáng)度,單邊螺栓-T 形件連接節(jié)點(diǎn)在復(fù)式鋼管混凝土結(jié)構(gòu)中傳力可靠,結(jié)構(gòu)整體性較好.
關(guān)鍵詞: 單邊螺栓; T 形件; 低周往復(fù)荷載試驗; 滯回性能; 承載力; 延性
中圖分類號:TU312+. 3 文獻(xiàn)標(biāo)志碼:A 文章編號:1002-848X(2023)10-0055-07
DOI:10. 19701 / j. jzjg. 20210513
Experimental study on hysteresis behaviors of T-stub joints with single-side bolt
ZHANG Yufen1, WANG Duo2, GAO Jiaqi1, MIAO Yunsen2, HU Hetao2
(1 School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China;2 China Construction First Engineering Bureau (Group) Co. , Ltd. , Beijing 102600, China)
Abstract: Based on the section characteristics of double steel tubes in composite concrete-filled steel tubular ( CFST)columns, T-stub joints with single-side bolt were designed. Five T-stub joints with single-side bolt and one T-stub jointswith core bolt were tested under low cycle reciprocating load. The bending moment-rotation curves were obtained by thedigital speckle correlation method ( DSCM). The results show that hysteretic curves of the specimens are all full inZ-shape. The failure mode of the joints is the plastic deformation of the steel beam flange after yielding of T-stub. T-stubsfailed as three deformation characteristics due to different ribbed types. Except for the specimens with thin T-shaped flangethickness and no ribs, they are semi-rigid joints of partial strength, and the other specimens are full strength semi-rigidjoints. The ultimate bearing capacity of the ribbed T-stub joint was increased by 30% than that of the unribbed specimens,but the ductility is significantly reduced. Compared to the T-stub joints with core bolt, the initial stiffness of T-stub jointswith single-side bolt is reduced slightly and the bearing capacity is almost the same, while deformation ability and hystereticproperty are improved obviously. T-stub joints with single-side bolt worked alternately in tension and compression underreciprocating load, and tensile blind bolts could achieve strong anchorage connection strength. T-stub joints with single-sidebolt in double steel tubes in composite CFST structure have reliable force transferring and good structural integrity.
Keywords:single-side bolt; T-stub; low cycle reciprocating loading test; hysteresis behavior; bearing capacity; ductility
∗國家自然科學(xué)基金面上項目(52078179).
第一作者:張玉芬,博士,教授,博士生導(dǎo)師,主要從事鋼-混組合結(jié)構(gòu)研究,Email: 13522998929@ 163. com.
[引用本文] 張玉芬,王奪,高嘉岐,等. 單邊螺栓-T 形件連接節(jié)點(diǎn)滯回性能試驗研究[ J]. 建筑結(jié)構(gòu),2023,53(10):55-61. ZHANG Yufen,WANG Duo,GAO Jiaqi,et al. Experimental study on hysteresis behaviors of T-stub jointswith single-side bolt[J]. Building Structure,2023,53(10):55-61.
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