Analysis of the shear mechanism of reinforced concrete deeply bent members

deeply bent members;  shear strength;  Truss arch

The calculation model of truss arch is suitable for the stress characteristics of reinforced concrete bending members. According to the stress diffusion phenomenon of concrete diagonal stud when pressure is transmitted obliquely in the model, the model is further modified. Referring to the strength criterion of concrete in bidirectional stress state, and combined with the actual engineering situation, a practical calculation formula for shear bearing capacity considering the influence of shear span ratio, span height ratio, vertical abdominal tendon and horizontal abdominal tendon is proposed, and the concrete action term in the formula takes concrete tensile strength as the strength design index, which has been adopted by China’s concrete structure design code. The revised computational model has clear physical concepts and strict mechanical analysis, which has important reference significance for improving the design theory of shear strength of deeply bent members.