General cracked-hinge model for simulation of low-cycle damage in cemented beams on soil

Abstract

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A simple model for fatigue crack growth in concrete applied to a hinge beam model

“…From Figure 3 (a) it is observed that the proposed secant unloading scheme does not comply perfectly with experimental curves due to the secant unloading scheme selected. However, it was proposed in [23] to define a fixed negative intersecting point σ k u of -0.4f t on the ordinate, for which results are shown in Figure 3 (b). In this model the parameter σ k u is fitted and the response simplified, i.e.…”

“…In the present study the hinge formulation proposed by Skar et al [23] is applied. This hinge consists of fibers of concrete material, shown in Figure 4.…”

“…where N i and M i are the normal force contribution and moment contribution from each strip, respectively. It was found in [23] that sufficient accuracy of the hinge response can be obtained with app. 10-30 fibers.…”

“…The presented model represent an extension and generalization compared to previous hinge models, see e.g. [23], accounting for the material behaviour in all the cracked phases, linking the development of the fracture process zone and damage of the existing fracture process zone to the monotonic material characteristics in a rational manner.…”

“…For structural analysis of concrete beams, the fiber stress-mean strain relationship is incorporated in a hinge as proposed by Skar et al [23]. Hinge models have been effectively applied for studying crack growth phenomenon in both plain concrete beams [24,25,26,27], as well as reinforced and fiberreinforced concrete beams [28,10,29,30,31].…”