简要介绍了全新的抗剪分析方法——修正压力场理论(MCFT),并将该理论应用于超高韧性水泥基复合材料梁抗剪性能研究分析中。在此基础上建立了钢筋增强超高韧性水泥基复合材料(UHTCC)梁在弯剪复合作用下的截面分析模型;根据计算模型编制了程序,并利用该程序对UHTCC材料梁进行抗剪承载力的理论计算;同时对UHTCC梁试件进行加载试验,并将理论值与试验值进行了对比,结果显示两者较为吻合,表明MCFT理论能够较好地分析超高韧性水泥基复合材料梁的抗剪性能。进一步研究表明:UHTCC材料简支梁中的箍筋一般能够达到屈服状态,能够承担裂缝间的应力;MCFT理论计算值能反映箍筋受力的实际情况,该理论可用于对UHTCC材料梁抗剪承载力的理论计算。
MCFT (modified compression field theory) was applied to analyse the shear resistance of ultra-high toughness cementitious composite (UHTCC) beam. A program based on the section analysis model for reinforced UHTCC beam under bending and shearing action was established to predict the shear capacity of simply-supported UHTCC beams. Besides, loading test was conducted on the beam specimens, and the measured test results were compared with the theoretical results calculated by this program. The results were consistent, indicating that MCFT could well analyse the shear resistance of UHTCC beams. Further analysis shows that the reinforcement stirrups could generally reach yield state and are capable of bearing the stress between cracks. The calculation results based on MCFT could reflect the real forces on the reinforcement stirrups.
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