Calculation method for crack width of UHPC beams considering bond slip effect
To establish a crack width calculation formula applicable to reinforced ultra-high performance concrete(UHPC)beams,a crack width calculation method considering bond slip effects was proposed.Based on the four-point flexural tests of 10 UHPC-T beams with steel fiber content,reinforcement ratio and protective layer thickness as parameters,the effects of each parameter on the failure pattern and maximum crack width of the test beams were studied.The equations for calculating the crack width of reinforced UHPC beams were established by using the balance and deformation differential governing equations based on microelements and the interfacial bond slip relation considering many influential factors.The correctness and applicability of the formula for calculating crack width were verified by comparing with the experimental and literature values.The results show that the established formula can fully reflect the tensile contribution of steel fiber and the influence of interface bonding and sliding properties of steel bar and UHPC.The calculated values are in good agreement with the experimental values,and the crack widths of reinforced UHPC beams can be accurately calculated.
万方数据
维普
