By L. Elfgren, Surendra Shah
This ebook provides the newest examine findings of the short constructing purposes of fracture mechanics to concrete constructions. Key papers from best specialists within the box describe latest and new modelling recommendations within the research of fabrics and buildings. The booklet explains the sensible program of fracture mechanics to structural modelling, bending, shear, bond and anchorage. The complaints of this RILEM Workshop should be an immense reference for these engaged in layout, improvement, learn and instructing within the box of concrete constructions.
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Extra info for Analysis of concrete structures by fracture mechanics: proceedings of the International RILEM workshop, Abisko, Sweden, June 28-30, 1989
3 Double-edge-notched square plate for the mixed-mode tests. vertical (tensile) direction by an immediate change of polarity of the axial loading. Therefore, the influence of creep-effects can be neglected. EXPERIMENTAL RESULTS Depending on the actual boundary conditions (load-paths) in the experiments, rather distinct responses were measured. The fracturing of the specimens was recorded in detail, in some cases even using reflection photoelasticity . For all details, the reader is refered to ,  and .
Only a small number of tests was carried out at smaller crack openings. In load-paths (1) and (2) the shear load was either compressive or tensile, whereas in load-path (3) compressive shear was applied. In the initial experiments , the shear was applied in load-control, whereas in the more recent tests , shear loads were applied in displacement-control via two LVDTs measuring the relative displacements of the two specimen halves (that are separated partially by the axial crack). 60 µm/min (when a test was carried out in displacement-control) or 20 N/s (in load-controlled testing) in the horizontal (shear) direction.
9]), viz. 09 for the same crack opening rangeas tested (200–400 µm for normal-weight concrete, see ). As argued in , the differences might be explained from neglecting the coupling between shear stiffness and shear displacements. Furthermore, an assumption in conventional aggregate interlock theories is that the principal stress axes are fixed and that shear is transfered in the crack plane. Rotation of principal stresses occurred in the experiments reported in this paper (Figs. 138–146).
Analysis of concrete structures by fracture mechanics: proceedings of the International RILEM workshop, Abisko, Sweden, June 28-30, 1989 by L. Elfgren, Surendra Shah