Analysis of the Shear Capacity of Ultrahigh Performance Concrete Beams Based on the Modified Compression Field Theory

An analysis model of the shear capacity prestressed ultrahigh performance concrete (UHPC) beams under combined action bending and shearing was established in this paper based on modified compression field theory by considering unique material constitutive relation UHPC. Shear tests were performed using three UHPC-T with different shear-span ratios to verify correctness model. The results showed that ratio greatly influenced failure modes beams. Upon increasing ratio, inclined failure, diagonal tension successively. When changed from 1.04 2.12, bearing decreased greatly; however, when 2.12 3.19, decrease very small. In addition, MCFT used analyze experimental data, predicted good agreement, which proved applicability Finally, according existing test UHPC main influencing factors, a simplified formula for predicting obtained fitting. Comparing other pieces literature, accurately presented provide powerful tool beams, will contribute design