Experimental research was conducted on the flexural performance of T-shaped transverse joints suitable for the negative bending moment area of lightweight composite bridges.A theoretical analysis of the entire process of applying negative bending moments was conducted,and the design parameters for the joint were discussed.Results show that the primary crack in the specimens appears at the interface of the continuously cast UHPC joint and the panel surface below the loading point as the load increases.No significant cracks were observed in the middle of the specimens,and the visual initial crack strength of the UHPC joint interface can meet the design loads of real bridges.An analysis of the test beam was conducted,and formulas for calculating the maximum crack width of the joint,the design bending moment considering the effect of UHPC tensile stiffness,and deflection were proposed.Formulas for calculating the bearing capacity at each stage were obtained,and the predicted results accorded well with the experimental results.Parameter discussions and calculations show that the upper extended length of T-shaped joint in lightweight composite bridges with spans ranging from 20 m to 50 m can be set to 0.1 times of spans.
ultra high performance concrete(UHPC)/UHPC joint/bending resistance test/calculation formula of crack width/calculation formula of deflection/calculation formula of ultimate bearing capacity
维普
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