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（武漢科技大學(xué)城市建設(shè)學(xué)院， 武漢 430065）

［摘要］為了研究方鋼管混凝土柱-H型不等高鋼梁框架節(jié)點(diǎn)的抗震性能，基于現(xiàn)行規(guī)范按縮比1∶3設(shè)計(jì)并制作了4個(gè)方鋼管混凝土柱-H型不等高鋼梁外加強(qiáng)環(huán)式框架節(jié)點(diǎn)模型，對(duì)其進(jìn)行擬靜力加載試驗(yàn)，以梁高差為參數(shù)，研究該類(lèi)節(jié)點(diǎn)的滯回曲線、延性、強(qiáng)度與剛度退化、耗能性能。試驗(yàn)結(jié)果表明：4個(gè)試件的破壞均發(fā)生在梁端，節(jié)點(diǎn)核心區(qū)均沒(méi)有破壞，滿足“強(qiáng)剪弱彎、強(qiáng)節(jié)點(diǎn)弱構(gòu)件”設(shè)計(jì)要求；所有試件的滯回曲線均有捏縮現(xiàn)象，呈弓形；節(jié)點(diǎn)在反向加載時(shí)的承載力要高于正向加載時(shí)的承載力，且隨著梁高差的變化，試件破壞形態(tài)有所不同；該類(lèi)節(jié)點(diǎn)強(qiáng)度衰減、剛度退化明顯；4個(gè)試件的延性系數(shù)為3-956～4-388，能量耗散系數(shù)為1-383～1-811，等效黏滯阻尼系數(shù)為0-220～0-288，說(shuō)明該類(lèi)節(jié)點(diǎn)具有較強(qiáng)的耗能能力，但隨著左右梁高差的增大，耗能能力逐漸降低。

［關(guān)鍵詞］抗震性能； 梁高差； 滯回曲線； 剛度退化； 耗能性能

中圖分類(lèi)號(hào)：TU398-9文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)14-0048-08

Experimental study on seismic behavior of joints in the frame with concrete-filled steel square tubular column and H-shaped unequal height steel beam

Xu Chengxiang, Qiu Yingwei, Jian Qi′an, Lu Youfeng

（School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China）

Abstract:In order to study the seismic behavior of joints in the frame with concrete-filled square steel tubular columns and H-shaped unequal height steel beam, based on the current specifications, four outer ring frame models with concrete-filled  square steel tubular column and H-shaped unequal height steel beam were designed and fabricated according to the reduction ratio of 1∶3. And the pseudo-static loading test was carried out. The hysteresis curve, ductility, strength and stiffness degradation and energy dissipation performance of the nodes were studied with the beam height difference as the parameter. The test results show that the damage of the four specimens occurs at the beam end, and there is no damage in the core area of the joint, which satisfies the design requirements of “strong shear weak bend and strong joint weak component”; the hysteresis curves of all test pieces have pinch phenomenon and bow shaped. The arch bearing capacity of the joint is higher than that of the forward loading, and the deformation modes of the specimens are different with the variation of the beam height; the strength attenuation and stiffness degradation of the joint are obvious. The ductility coefficients of the four specimens are 3-956～4-388, the energy dissipation coefficient is 1-383～1-811, and the equivalent viscous damping coefficient is 0-220～0-288, indicating that the nodes have strong energy dissipation capacity. But with the increase of differences in the left and right beam heights, the energy consumption gradually decreases.

Keywords:seismic performance; beam height difference; hysteresis curve; stiffness degradation; energy dissipation performance