Direct shear behavior in concrete materials

French, Roger H.; Maher, Eoghan; Smith, M. F.; Stone, M.H.; Kim, J.; Krauthammer, Theodor

doi:10.1016/j.ijimpeng.2017.03.027

Cited by 27 publications

(5 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Studies have shown that using UHPC as a prefabricated component can enhance structural fatigue performance, service performance, ductility, and stiffness performance in prefabricated structures and reduce the structural weight [ 15 ]. Further, according to French R et al [ 16 ], the addition of fibers significantly increased the peak shear stress and the corresponding shear slip of concrete. The prefabricated bridge deck joints are divided into wet joints and dry joints.…”

Section: Introductionmentioning

confidence: 89%

Interfacial Shear Performance of Epoxy Adhesive Joints of Prefabricated Elements Made of Ultra-High-Performance Concrete

Zhang

Zou

et al. 2022

Polymers

View full text Add to dashboard Cite

Application of ultra-high-performance concrete (UHPC) in joints can improve the impact resistance, crack resistance, and durability of structures. In this paper, the direct shear performance of ultra-high-performance concrete (UHPC) adhesive joints was experimentally studied. Twenty-four direct shear loading tests of UHPC adhesive joints were carried out considering different interface types and constraint states. The failure modes and load-slip curves of different interfaces were studied. Results indicated that passive confinement could enhance the strength and ductility of the interface; the average ultimate bearing capacity of the smooth, rough, grooved, and keyway specimens with passive restraint were, respectively, increased by 11.92%, 8.91%, 11.93%, and 17.766% compared with the unrestrained ones. The passive constraint force changes with the loading and finally tends to be stable. The epoxy adhesive has high reliability as a coating for the UHPC interface. The adhesive layer is not cracked before the failure of the specimen, which is also different from the common failure mode of adhesive joints. Failure of all specimens occurred in the UHPC layer, and the convex part of the groove interface shows the UHPC matrix peeling failure; the keyway interface is the shear damage of the key-tooth root, and the rest of the keyway showed UHPC surface peeling failure. According to the failure mode, the shear capacity of UHPC keyway adhesive joints under passive restraint is mainly provided by the shear resistance of key teeth, the friction force of the joint surface, and the bonding force of the UHPC surface. The friction coefficient was determined based on the test results, and the high-precision fitting formula between the shear strength of the UHPC surface and the passive constraint force was established. According to the Mohr stress circle theory, the proposed formula for direct shear strength of UHPC bonded joints under passive constraint was established. The average ratio of the proposed UHPC adhesive joint calculation formula to the test results was 0.99, and the standard deviation was 0.027.

show abstract

Section: Introductionmentioning

confidence: 89%

Interfacial Shear Performance of Epoxy Adhesive Joints of Prefabricated Elements Made of Ultra-High-Performance Concrete

Zhang

Zou

et al. 2022

Polymers

View full text Add to dashboard Cite

show abstract

“…Under these situations, the shear strength of concrete might play an important role [40] on the failure of the structure partially or completely. As a fundamental characteristic, the shear behavior of concrete has been investigated for more than four decades [41]. Various investigators have made efforts to develop a reliable test procedure to represent the shear behaviour sufficiently [42].…”

Section: Introductionmentioning

confidence: 99%

The direct shear behavior of recycled lump concrete

2021

Mater Struct

View full text Add to dashboard Cite

To study the direct shear behavior of recycled lump concrete, 116 prismatic specimens were fabricated and tested under double-direct shear loading. Four variables were considered: the replacement ratio of recycled concrete lumps, the characteristic ratio of recycled concrete lumps (i.e., the characteristic size of lumps as divided by the lateral dimension of prism), the prisms' lateral dimension and the strength of fresh concrete matrix. A formula has been established, which adequately predicts the direct shear strength of the recycled lump concrete. Moreover, a model presented describes the relationship between the size of the prism tested and the direct shear strength observed. The direct shear strengths of fresh concrete and recycled lump concrete present a smaller gap than the compressive strengths of them. With normal-strength concrete as the matrix, the ratio of the direct shear strength to the compressive strength for recycled lump concrete is about 0.91 times that for fresh concrete alone. With high-strength concrete as the matrix, the ratio is about 1.08 times. For a given size of specimen, the impact of lump size on the direct shear strength of the recycled lump concrete is basically negligible. At a given characteristic ratio of lumps, the size of specimen impacts on the direct shear strength of recycled lump concrete in a similar way to the direct shear strength of conventional concrete.

show abstract

“…For example, Zhang [ 13 ] obtained the stress–strain curve nearing the peak shear strength of natural aggregate concrete by conducting a shear test on short rectangular concrete beams. R. French [ 14 ] proposed a shear model with the aid of both static and dynamic direct shear tests on concrete materials. On the basis of investigating the shear mechanical properties and microstructure of three types of RAC, Liu [ 15 ] created stress–strain constitutive models of RAC under shear load and established formulas for its shear modulus.…”

Section: Introductionmentioning

confidence: 99%

Study on the Strength Performance of Recycled Aggregate Concrete with Different Ages under Direct Shearing

et al. 2021

View full text Add to dashboard Cite

In order to study the mechanical properties of recycled aggregate concrete (RAC) at different ages, 264 standard cubes were designed to test its direct shear strength and cube compressive strength while considering the parameters of age and recycled aggregate replacement ratio. The failure pattern and load–displacement curve of specimens at direct shearing were obtained; the direct shear strength and residual shear strength were extracted from the load–displacement curves. Experimental results indicate that the influence of the replacement ratio for the front and side cracks of RAC is insignificant, with the former being straight and the latter relatively convoluted. At the age of three days, the damaged interface between aggregate and mortar is almost completely responsible for concrete failure; in addition to the damage of coarse aggregates, aggregate failure is also an important factor in concrete failure at other ages. The load–displacement curve of RAC at direct shearing can be divided into elasticity, elastoplasticity, plasticity, and stabilization stages. The brittleness of concrete decreases with its age, which is reflected in the gradual shortening of the elastoplastic stage. At 28 days of age, the peak direct shear force increases with the replacement ratio, while the trend is opposite at ages of 3 days, 7 days, and 14 days, respectively. The residual strength of RAC decreases inversely to the replacement ratio, with the rate of decline growing over time. A two-parameter RAC direct shear strength calculation formula was established based on the analysis of age and replacement rate to peak shear force of RAC. The relationship between cube compressive strength and direct shear strength of recycled concrete at various ages was investigated.

show abstract

Direct shear behavior in concrete materials

Cited by 27 publications

References 6 publications

Interfacial Shear Performance of Epoxy Adhesive Joints of Prefabricated Elements Made of Ultra-High-Performance Concrete

Interfacial Shear Performance of Epoxy Adhesive Joints of Prefabricated Elements Made of Ultra-High-Performance Concrete

The direct shear behavior of recycled lump concrete

Study on the Strength Performance of Recycled Aggregate Concrete with Different Ages under Direct Shearing

Contact Info

Product

Resources

About