Abstract
The paper reports the results of a comparative analysis of the experimental shear capacity obtained from the tests of reinforced concrete beams with various static schemes, loading modes and programs, and the shear capacity calculated using selected models. Single-span and two-span reinforced concrete beams under monotonic and cyclic loads were considered in the analysis. The computational models were selected based on their application to engineering practice, i.e., the approaches implemented in the European and US provisions. Due to the changing strength characteristics of concrete, the analysis was also focused on concrete contribution in the shear capacity of reinforced concrete beams in the cracked phase and on the angle of inclination of diagonal struts. During the laboratory tests, a modern ARAMIS digital image correlation (DIC) system was used for tracking the formation and development of diagonal cracks.
Highlights
Introduction and Cyclic LoadsExperiments andThe issue of the load-bearing capacity of reinforced concrete (RC) beams in the support zone, though extensively studied for years, still lacks proper understanding [1]
Analysis of the shear capacity of reinforced concrete beams was primarily focused on the obtained load levels at which the element failed
The digital image correlation (DIC) system (ARAMIS) helped determine the angle of inclination θ of the diagonal compression struts at the moment corresponding to the force destructive value
Summary
Introduction and Cyclic LoadsExperiments andThe issue of the load-bearing capacity of reinforced concrete (RC) beams in the support zone, though extensively studied for years, still lacks proper understanding [1]. At service loads, reinforced concrete members go through two different stages, uncracked and cracked, which alter the state of internal stresses, leading to a change in concrete behavior. All this renders the description of RC member behavior under load a very challenging task and requires the adoption of many simplifying assumptions that must be verified experimentally. Determining maximum values of major tensile stresses occurring in the support zone can be limited, with some simplifications, to determining shear stresses in the neutral axis For this reason, the bearing capacity is most often referred to as shear capacity
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