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Load capacity behavior of thin-walled structures

Buckling and load analysis with ANSYS

Branch : Automotive (motor vehicles/trucks)Specialist field: Structural mechanics

Determination of the buckling behavior and the loads of a telescopic boom of an aerial work platform

Summary

Task

The profile cross-sections of aerial work platforms usually represent a combination of box and round profiles with variable wall thicknesses. Due to the dimensions and the loads, buckling behavior plays an essential role in the load capacity calculation of these constructions.

Solution

When calculating the load capacity of thin-walled structures, the selection of a suitable imperfection is an important point in the calculation. In order to determine a suitable imperfection, a prestressed linear buckling analysis is generally performed before the actual payload calculation.

Customer benefits

With FE-analysis, the analytical verification procedures could be secured for several load cases and geometry variants could be investigated.

Project Details

Task

The world-renowned STEIGER® aerial work platforms from Ruthmann GmbH & Co. KG reach working heights of up to 100 m. The profile cross-sections of such telescopic platforms usually represent a combination of box and round profiles with variable wall thicknesses. Due to the dimensions and the loads, buckling behavior plays an essential role in the load capacity calculation of these constructions. However, since the profiles are difficult to trace back to geometrically distinct shapes such as the circular cylindrical shell, an analytical solution is only possible to a limited extent. Furthermore, several load cases and load combinations must be considered in the design of such devices.


Customer Benefit

With FE-analysis, the analytical verification procedures could be secured for several load cases and geometry variants could be investigated.


Solution

When calculating the load capacity of thin-walled structures, the selection of a suitable imperfection is an important point in the calculation. In order to determine a suitable imperfection, a prestressed linear buckling analysis is generally performed before the actual payload calculation. The calculated first buckling shape of the linear buckling analysis is then scaled and applied as an imperfection to the system and the payload calculation is performed. The investigations are divided into sub-segments of the overall structure, whereby the applied loads result from the cutting loads of the overall system. In addition to geometric non-linearity, the load calculation also considers non-linear material behavior and non-linear contact.


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