Abstract
Seven steel-reinforced concrete (SRC) deep beams were tested to investigate the shear performance, including peak loads, failure modes, mid-span deflections, and cracking patterns. The parameters include the shear span-to-depth ratio and the dimensions of the steel skeleton. The digital image correlation (DIC) technique was utilized for real-time recording of the in-plane strain and deformation. The experiment results show that the failure modes of specimens could be concluded as two forms: diagonal compression failure and shear failure. The DIC technique was proved to be efficient for tracking the development of crack patterns and recording the failure modes. The corresponding numerical analyses based on experiments were carried out and demonstrated to be a reliable method to simulate the shear response. Furthermore, the most significant parameters and their interactions were identified by finite element models parameter analysis. The steel skeleton height and shear span-to-depth ratio were the main parameters affecting shear capacity. A design formula based on the strength superposition method was presented. The calculated results were basically in agreement with the test results, where the mean and coefficient of variation were 1.04 and 0.09, respectively.
Highlights
E shear capacity of steel-reinforced concrete (SRC) members is divided into the RC part and the steel skeleton part
Due to the complex stress state of SRC deep beams, it is difficult for traditional measuring tools to capture the variation law of concrete surface strain. us, in order to continuously and accurately observe the shear response and cracking pattern of SRC deep beams, the digital image correlation (DIC) technology was applied to this experiment. is technology is a noncontact modern optical measurement technology, which has the merits of a simple measuring device, strong environmental adaptability, and a wide measurement range
Its basic principle is to get the displacement by tracking the position of the same pixel in the two speckle images before and after the surface deformation, thereby obtaining the whole field displacement and strain of the surface. is technology overcomes the shortcomings of traditional strain gauge measurement and naked eye identification of cracks, which can continuously observe the development of crack and surface strain [18]
Summary
For a clear description of the diagonal compression, specimen RDB-1 is taken as an example; its failure mode and the measured load-deflection curve are shown in Figures 3(a) and 9(a). When the peak load was reached, the specimen failed suddenly without warning and exhibited a brittle failure mode At this time, a serious diagonal crack emerged on the concrete failure surface, and the bearing capacity of the specimen decreased rapidly. Strain measurements indicated that the stirrups and steel skeleton webs at the diagonal cracks of the beams all reached the yielding value. 3. Finite Element Analysis ree-dimensional finite element models (FEMs) have been developed to simulate the nonlinear shear response of the SRC deep beams based on the ABAQUS software. The FEM simulated the shear capacity with accuracy. e average simulated-to-test ratio of shear capacity was 1.05, and the coefficient of variation (COV) was 0.04. e shear capacity of the test results agrees well with the numerical simulation. e FEM has been proved as a reliable numerical method to simulate the shear response of specimens. erefore, the FEM can be applied to the parametric design-oriented study and can be researched for the effects of main parameters on the shear behavior
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