“…It is based on an extension of the concept of plastic hinges in beam calculations. It is able to account for softening as in other damage theories [27] or due to local buckling [28]. Up to now, the parameters of the constitutive law of hinges, and more generally of beams, relied upon global data such as displacements at few prescribed measurement points [29].…”
a b s t r a c tIt is proposed to develop a digital image correlation procedure that is suitable for beams whose kinematics is described by an Euler-Bernoulli hypothesis. As a direct output, the degrees of freedom corresponding to flexural and axial loads are directly measured. The performance of the correlation algorithm is evaluated by using a picture of a cantilever beam experiment. One load level is analyzed with the present algorithm. The latter is validated by comparing the displacement field with that given by a finite element based correlation algorithm. It is also shown that a locally buckled zone is detectable with the present procedure.
“…It is based on an extension of the concept of plastic hinges in beam calculations. It is able to account for softening as in other damage theories [27] or due to local buckling [28]. Up to now, the parameters of the constitutive law of hinges, and more generally of beams, relied upon global data such as displacements at few prescribed measurement points [29].…”
a b s t r a c tIt is proposed to develop a digital image correlation procedure that is suitable for beams whose kinematics is described by an Euler-Bernoulli hypothesis. As a direct output, the degrees of freedom corresponding to flexural and axial loads are directly measured. The performance of the correlation algorithm is evaluated by using a picture of a cantilever beam experiment. One load level is analyzed with the present algorithm. The latter is validated by comparing the displacement field with that given by a finite element based correlation algorithm. It is also shown that a locally buckled zone is detectable with the present procedure.
“…These results confirm that the damage mechanism for each type was different depending on the frame shape. Originally, the limit strain on the compression side should be taken into account the local buckling (e.g., Sohal and Chen, 1987) of the member. However, in this study, steel pipe members (D/t = 400.0/14.0 = 29) below the diameter thickness ratio (D/t ≤ 60) which is safe for local buckling shown in design manual of steel sabo structures (Sabo & Landslide Technical Center [STC], 2009) are used, so that it is the same as the tension side for the convenience of analysis.Figure 13.Damage mechanism at ultimate limit state for front loading.…”
Section: Safety Assessment On Load-carrying Capacity Of Steel Open Da...mentioning
Recently, steel pipe open type protective structures (steel open dams) have been damaged because of large-scale debris flow resulting from torrential rainfall based on abnormal climate. This article proposes a safety assessment method for the load-carrying capacity of a steel open dam against large-scale debris flow load (level II load) using the energy constant law. First, the safety assessment method of steel open dams is proposed that the ultimate strength must be larger than the required strength against the level II load, which is determined by using the energy constant law. Second, the load-carrying capacities of three types of steel open dams with different structural shapes against the front and eccentric debris flow loadings are investigated by a push-over analysis. Finally, the safety assessments on load-carrying capacities against the front and eccentric debris flow loading are confirmed and the strength reduction by the eccentric loading is examined for three steel open dams.
“…Some of these hypotheses can also be found in Refs. [15,27]. In the first part of the beam where the inertia is denoted byĨ ≤ I 0 (i.e., 0 ≤ x ≤ lb ), the rotation field…”
Section: Second Model: Piece-wise Constant Inertiamentioning
It is proposed to identify the behavior of steel beams prior to and after the inception of local buckling by using Digital Image Correlation. Full field measurements are used to evaluate kinematic and static fields for determining constitutive laws. It enables for the detection of local buckling inception and the evaluation of the postbuckled behavior. Constitutive models are tuned by using measured Euler-Bernoulli kinematics.
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