In sheet pile construction, by Finite Element Method, we should establish analysis model first.Then calculate and analyze sheet pile security and stability.
The external force is mainly hydrostatic pressure and water pressure, by the force expectations and calculations the combined load in each condition can be drawn. Using ANSYS Finite Element software to build a solid model, define the real constants and material properties, take four-node shell element Shell Elastic 4Node63 to divide unit for the model, respectively calculate the deflection, stress, bending moment in the model under these N kinds of loading conditions.
Combining loading conditions, calculate by finite element to get force map, and then by the post-processing data to get the maximum stress on sheet pile. Taking into account stress reduction factor 0.7 for the old or used sheet pile, the stress’s expansion factor 1.3 for the temporary structure and the sheet pile materials, calculate sheet pile actual allowable stress.
Similarly, from the analysis obtain the sheet pile deflection diagram in the X and Y direction, from the map we can intuitively know the location of maximum deflection under the wost condition. Compare the distance with the actual allowable sheet pile deflection.
If the maximum stress obtained through finite element analysis is less than the actual allowable stress, the maximum deflection less than the actual alloable deflection, it indicates that the strength and stiffness of the selected sheet pile in this condition meet the design requirements.
In the same way, we can also calculate maps of the displacement, deflection, bending moment and the axis of purlin and inside-support, compare the maximum value with the actual allowable one, to determine if the strength,stiffiness and stability of purlin and inside-support meet the design requirements.
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