(a) The mean ultimate tensile strength of a steel is 1500 MPa. What value should be used if the design calls tor a reliability of 99%. (b) Calculat the factor of safety against quasi-static failure at a point in a structure where there is a 2-D state of plane stess with ơxx=-35 ksi, oyy = 10 ksi and Tyy 0 ksi. The material is class 30 grey cast iron with Sut = 32ksi ; Suc =-109ksi.

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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.