At a point on a steel part of landing gear (E = 200 GPa, v = 0.3, Oy = 225 MPa) subjected to a plane stress, a 60° rosette shown in the figure measures the strains e,=1200x10-6, eL=-650x10-6 and e=550x10-6. Determine, a) The principal strains and corresponding principal stresses, b) Determine if the point to fail according to the maximum-shear-stress theory and the maximum-distortion-energy theory, c) Explain why we need these failure theories in structural mechanics. B 60° C 60° 60°

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Measuring site work, Excavation and Piling

Bid drawings typically include very little material about the precise requirements of site work operations, measuring site work and excavation work differs from measuring most other works on a construction project. The actual site work conditions are not provided and also the dimensions of the excavations are not known during the pre-construction phase. The precise measurement of the excavation and backfill of the earth material and topsoil is important for a contractor to decide upon the total cost required for the process. All the works should be carried out under OSHA (Occupational Safety and Health Administration) standards to ensure the safety of the workers.