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对7根T形型钢混凝土柱进行了火灾后的力学性能试验研究。火灾试验按照ISO834标准升温过程进行控制,1根未受火试件作为对比。T形型钢混凝土柱采用空腹式配钢形式,横向腹杆间距为200mm,试件通过偏心受压试验,考虑加载角和偏心距的影响。通过试验得到异形柱极限承载力、截面应变分布、荷载-挠度曲线以及截面特性。试验结果表明:(1)受火1h后,T形型钢混凝土柱仍然具有比较高的竖向承载力;(2)桁架式配钢方式以及合理的腹杆、箍筋布置保证了型钢与混凝土之间能够较好的协同工作,平截面假定对火灾后的T形型钢混凝土柱仍然适用;(3)荷载角和偏心距对试件的延性和变形能力影响显著。
Seven T-shaped steel reinforced concrete columns after fire mechanical properties of the pilot study. Fire test according to ISO834 standard temperature control process, a fire test is not as a contrast. T-shaped steel reinforced concrete column with the form of fasting with steel, horizontal web spacing of 200mm, the specimen through the eccentric compression test, taking into account the loading angle and eccentricity. The ultimate bearing capacity, cross-sectional strain distribution, load-deflection curve and cross-section characteristics of special-shaped columns were obtained through experiments. The test results show that: (1) T-shaped steel reinforced concrete columns still have relatively high vertical bearing capacity after being exposed to fire for 1h; (2) The truss-type steel distribution method and reasonable webs and stirrups arrangement ensure that the cross- Between the pre-fire and post-fire T-shaped steel concrete columns. (3) The influence of load angle and eccentricity on the ductility and deformation capacity of the specimens is significant.