Abstract:The Specifications for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts (JTG 3362-2018) gives the calculation method of the ultimate bearing capacity of the short cantilever cap beam based on the rigid tie-and-strut model in the Stress disturbed regions(D regions), but for the normal use of the limit state crack-resistant checking has not been specified. If the rigid strut-and-tie model is used to check the crack resistance, the stress of the tie bars is often on the high side and the reinforcement is too conservative. In fact, the stiffness of the tie rod is quite different from that of the strut. According to the flexible tie-and-Strut model with Finite Displacement, the calculation formula of the tensile force of the tie rod is derived, and verified by a finite element solid model with an engineering example. The results show that the calculation accuracy of flexible tie-and-strut model is higher, the results are in good agreement with those of finite element analysis, and can be used for reference in similar projects.
