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（青島理工大學(xué)土木工程學(xué)院， 青島 266033） 

［摘要］為研究分析火災(zāi)后十字形型鋼混凝土柱的力學(xué)性能，以是否受火以及軸壓比兩個(gè)變化因素，設(shè)計(jì)3根受火和1根未受火的型鋼混凝土十字形柱并進(jìn)行低周反復(fù)荷載試驗(yàn)。受火試驗(yàn)后，對(duì)十字形柱的滯回曲線、位移延性系數(shù)、骨架曲線等力學(xué)性能進(jìn)行分析。試驗(yàn)結(jié)果表明：十字形型鋼混凝土柱在軸壓比不同時(shí)表現(xiàn)的破壞形態(tài)不同，構(gòu)件的破壞形態(tài)隨軸壓比的增加發(fā)生了由剪彎破壞到彎曲破壞再到剪切破壞的過(guò)程；較未受火試件，火災(zāi)對(duì)十字形型鋼混凝土柱的材料力學(xué)性能造成損傷，試件耗能能力降低，水平極限承載力明顯下降，同時(shí)試件的剛度退化也比較嚴(yán)重；在一定范圍內(nèi)提高軸壓比，十字形型鋼混凝土柱耗能能力增大，其延性系數(shù)減小，同時(shí)增大軸壓比能夠有效地提高試件的極限承載力、增大試件的剛度。

［關(guān)鍵詞］火災(zāi)； 十字形型鋼混凝土柱； 軸壓比； 滯回曲線； 位移延性系數(shù)； 骨架曲線； 剛度； 耗能能力

中圖分類號(hào)：TU398-9文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)01-0069-05

Experimental study on seismic behavior of  cross-shaped steel concrete reinforced column after fire

Li Xiaodong， Zheng Zhiyuan， Wei Xiao， Gao Litang，  Liu Meng

(School of Civil Engineering， Qingdao University of Technology， Qingdao 266033, China)

Abstract:In order to study and analyze the mechanical properties of cross-shaped steel reinforced  concrete column after fire, 3 burned cross-shaped steel concrete reinforced columns  and 1 cross-shaped unburned steel reinforced concrete column were designed and tested under low cycle cyclic loading by two factors of fire and axial compression ratio. After fire tests, the hysteretic curves, displacement ductility coefficient and skeleton curves of cross shaped columns were analyzed. The test results show that the failure form of the cruciform steel concrete column is different at the different axial compression ratio. With the increase of the axial compression ratio, the failure mode of the component occurred from shear bending failure to bending failure to shear failure. Compared with unfired test specimens, the fire causes damage to the mechanical properties of the cross shaped columns, reduces the energy consumption of the test specimens, and significantly reduces the horizontal ultimate bearing capacity. At the same time, the stiffness of the test specimens is severely degraded. Increasing the axial compression ratio within a certain range increases, the energy consumption capacity of the cross-shaped steel concrete column is increased, the ductility coefficient is reduced, at the same time, increasing the axial pressure ratio can effectively increase the ultimate bearing capacity and increase the stiffness of the test specimens.

Keywords:fire; cross-shaped steel reinforced concrete column;  axial compression ratio; hysteretic curve; disphacement ductility coefficient; seleton curve; stiffness; energy consumption

*國(guó)家自然科學(xué)基金項(xiàng)目（51178232/E080804）。

作者簡(jiǎn)介：李曉東，博士，副教授，Email:13969824568@163.com。