Abstract
This paper presents the results of the study of composite beam elements under the action of cyclic loads. The experimental results demonstrated that with a decrease in the level of applied load, with its frequency unchanged, the “viability” of the experimental composite beams increased (the number of cycles before collapse); under cyclic effects, shear deformations and contact openings are characterized by nonlinear functions.
Highlights
Numerous results of experimental studies of shear resistance of flat reinforced and nonreinforced contact joints are presented in the international literature [1, 2, 3, 4]
In most of these experiments, the contact joints were tested with monotonically increasing load until failure
Experiments simulating the behavior of contact joints are performed mainly on: a) cast-insitu samples with a contact crack preformed before testing; b) samples concreted sequentially and consisting of two contact surfaces simulating the joint between old and new concrete; c) samples with two contact surfaces simulating the connection of two precast elements; d) beam samples strengthened with a monolithic layer, with three-point bending causing indirect shear
Summary
Numerous results of experimental studies of shear resistance of flat reinforced and nonreinforced contact joints are presented in the international literature [1, 2, 3, 4]. In most of these experiments, the contact joints were tested with monotonically increasing load until failure. Experiments simulating the behavior of contact joints are performed mainly on: a) cast-insitu samples with a contact crack preformed before testing; b) samples concreted sequentially and consisting of two contact surfaces simulating the joint between old and new concrete; c) samples with two contact surfaces simulating the connection of two precast elements; d) beam samples strengthened with a monolithic layer, with three-point bending causing indirect shear
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