Investigation of v min based on experimental research

This paper presents an experimental research program aiming at assessing the current code provisions of vmin. A large test series was carried out, by varying the reinforcement ratio and loading conditions, the minimum average shear stress that can cause shear failure of a specimen with different depth, concrete strength is determined. The three...

Material model for non-linear finite element analyses of large concrete structures

A fully triaxial material model for concrete was implemented in a commercial finite element code. The only required input parameter was the cylinder compressive strength. The material model was suitable for non-linear finite element analyses of large concrete structures. The importance of including a crack closure algorithm was demonstrated on a...

Ruytenschildt Bridge: Field and laboratory testing

A large number of existing reinforced concrete solid slab bridges in the Netherlands are found to be insufficient for shear upon assessment. However, research has shown additional sources of capacity in slab bridges, increasing their total capacity. Previous testing was limited to half-scale slab specimens cast in the laboratory. To study the...

Dwarskrachtsterkte van verticaal voorgespannen tandopleggingen / Shear capacity of vertically prestressed half joints

The application of prefabricated and usually prestressed concrete elements has increased since mid-20th century. These elements are at the point of reaching the end of their life span, are subjected to damages or a change in functionality. Therefore, it is necessary to evaluate their structural safety. In many cases, existing structures do not...

Beam or truss mechanism for shear in concrete: Problems converting a beam into a truss

An unpublished study by Prof. A.W. Beeby shows the differences in strength capacity between a reinforced concrete beam without shear reinforcement and the same beam with a cut-out section at the middle of the span. The cut-out section exists at the bottom part of the beam while the reinforcement still remains. It remarkably turns out that the...

Theoretical and numerical approach of ultimate capacity of transversely prestressed concrete deck

Introduction Many researchers have been discovered that bridge deck slabs which were designed to fail in bending, mostly fail under punching shear mode at a higher load than the expected for bending, because of the effect of in-plane compressive membrane forces, induced by the lateral restrained boundary conditions. Punching and bending failure...

Shear Capacity of Concrete Beams under Sustained Loading

Long-term tests on large-scale concrete beams without shear reinforcement, which are tested for more than two years under sustained loading close to the ultimate shear capacity (load ratio ranging from 87% to 95%) under climate controlled condition, show that sustained loading has no significant effect on the shear capacity. Although many...