As the load is increased ([DELTA] = 6 mm), a diagonal crack
passing through the center of the opening forms and two additional cracks form in the lower right corner and in the bottom parts of the opening during the application of load.
When the lateral load reached 140 kN, the first diagonal crack
appeared in the midheight of the short column.
Moreover, each image sample is associated with one of the five classes of pavement conditions: alligator crack (AC), diagonal crack
(DC), longitudinal crack (LC), noncrack (NC), and transverse crack (TC).
It was noted that the failure occurred right after the initiation of a diagonal crack
which then caused the beam to split literally into two distinctive parts.
Under subsequent loading with displacement control, the cracks apparently expanded and a number of new diagonal cracks
emerged from the first diagonal crack
Failure of the plain concrete beam without stirrups (V-0-0) was characteristic of a shear failure by compression strut; i.e., a single diagonal crack
was formed in the web that spread to the upper beam.
In this experiment, shear failure mode with diagonal crack
propagating towards the load plate and support plate was dominant for unstrengthened RC deep beams as expected based on the prior research 12].
A diagonal crack
is defined as a major inclined crack, extending from the level of the flexural reinforcement towards the application point of the load, and the load at the growth of this first inclined crack is termed as the diagonal tension-cracking load ([P.sub.cr]).
There are not many reasons for a diagonal crack
to surface because of environmental stresses, except in the special case of stair-stepped cracks in masonry.
In the initial-crack stage, when the load reached about 55% of the peak load, the first diagonal crack
was observed in a diagonal direction of the joint area.
It is reminded that that there are five class labels in the data set: longitudinal crack (LC), transverse crack (TC), diagonal crack
(DC), spall damage (SD), and intact wall (IW).
Crack propagation in the horizontal direction is a representation of a diagonal crack
in the structures.