翻译的好再加50分。
Afiniteelementmodelwassetuptohelpunderstandthebehaviorofaconcretecanoeundervari...
A finite element model was set up to help understand the behavior of a concrete canoe under various static load cases. Both loading cases on simple supports demonstrated that the canoe acts longitudinally as avariable inertia U section beam subjected to bending loads. The hull of the canoe then acts as a membrane either in traction (upright simply supported) or compression (upside-down simply supported). Transversally, the canoe opens when simply supported and closes when simply supported upside-down. The hull then acts in transverse bending. It is interesting to note that the stresses and strains on upside-down simply supported conditions are considerably lower than for the upright conditions. Therefore, for transportation, the upright loading case is critical.
The canoe’s behavior with two and four paddlers resembles that of the simply supported case but with a variable hydrostatic pressure. The canoe still acts as a U section beam with a variable distributed pressure. In both cases, the canoe is in negative bending longitudinally and in positive bending transversally. The stresses and strains are similar to the ones of the simply supported loading scheme. Depending on the weight of the canoe and the weight of the paddlers, either of these cases can be critical. In the case Apogee 2002, the two paddlers loading case is more critical. The finite element analyses allow to asses the canoe’s behavior in details along with its sub-structures. The ribs considerably stiffen the canoe transversally. The stress field is also affected by the presence of ribs. Understanding the influence of each sub-structure allowed the optimization of the mass and rigidity of the canoe.
In order to validate the model, Apogee 2002 was subjected to in situ tests. During the tests, the loading cases were identical to that studied with the finite element model. The strains measured during the tests match closely the predicted values. It is therefore possible to confirm that the analyses performed with the finite element model are valid and represent accurately the actual behavior of the canoe.
To complete the analyses, dynamic tests were conducted.The test consisted in representing the canoe in racing conditions with two paddlers. The tests proved that the paddle strokes induce very little stress amplification for the hull and sub-structures. The tests also revealed that 1801 turns are not critical compared to straight lines. These tests allowed determining the dynamic amplification factor. A 1.25 dynamic amplification factor must be applied to the canoe and a 2.2 factor must be applied to the results of the more solicited fourth rib only.
别用什么有道 google 百度翻译直接粘贴过来了，这个我也会。真心求各位花点时间帮忙翻译一下。 展开
The canoe’s behavior with two and four paddlers resembles that of the simply supported case but with a variable hydrostatic pressure. The canoe still acts as a U section beam with a variable distributed pressure. In both cases, the canoe is in negative bending longitudinally and in positive bending transversally. The stresses and strains are similar to the ones of the simply supported loading scheme. Depending on the weight of the canoe and the weight of the paddlers, either of these cases can be critical. In the case Apogee 2002, the two paddlers loading case is more critical. The finite element analyses allow to asses the canoe’s behavior in details along with its sub-structures. The ribs considerably stiffen the canoe transversally. The stress field is also affected by the presence of ribs. Understanding the influence of each sub-structure allowed the optimization of the mass and rigidity of the canoe.
In order to validate the model, Apogee 2002 was subjected to in situ tests. During the tests, the loading cases were identical to that studied with the finite element model. The strains measured during the tests match closely the predicted values. It is therefore possible to confirm that the analyses performed with the finite element model are valid and represent accurately the actual behavior of the canoe.
To complete the analyses, dynamic tests were conducted.The test consisted in representing the canoe in racing conditions with two paddlers. The tests proved that the paddle strokes induce very little stress amplification for the hull and sub-structures. The tests also revealed that 1801 turns are not critical compared to straight lines. These tests allowed determining the dynamic amplification factor. A 1.25 dynamic amplification factor must be applied to the canoe and a 2.2 factor must be applied to the results of the more solicited fourth rib only.
别用什么有道 google 百度翻译直接粘贴过来了，这个我也会。真心求各位花点时间帮忙翻译一下。 展开
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