By Michael R. Pe Lindeburg
Is helping you arrange for the FE/FIT examination. Covers arithmetic, platforms of devices, statics, dynamics, chemistry, fabric technological know-how, AC/DC electrical energy, platforms modeling, computing device technological know-how, and engineering economics and extra. Paper. DLC: Engineering - difficulties, workouts and so on.
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Extra info for 1001 Solved Engineering Fundamentals Problems (3rd Edition)
It is helpful to discuss the reasons for some of the difficulties. One difficulty is that the soil, unlike concrete or steel, is a particulate material with little or no bonding between the particles. It is made up of an infinite variety of shapes and sizes of particles. This material is usually modelled as a continuum – but it is important never to forget that its properties are determined by its particulate nature. Because soil is particulate, the water pressures acting within the soil pores are just as important as the stresses applied to its boundaries.
The major difference between the predicted and observed movement is the overestimation of the inward movement beneath the final excavation level. This is a direct result of the deliberate choice of conservative values of the undrained Young’s modulus, Eu for the basement beds of the London Clay and the Woolwich and Reading beds. A large range of deflected shapes were observed for the various wall panels. 8(b) shows the two extreme cases given by inclinometers 3 and 10. The results demonstrate that, even for relatively uniform ground conditions, widely differing deflected shapes can be anticipated.
3 Modelling the ground movements A major task in the design of the car park was to estimate the effects of the excavation on the surrounding buildings and on the structure itself. Accordingly a detailed finite element analysis was undertaken. The analysis was based on a number of idealisations and it is important to be absolutely clear about these. Regarding the mechanical properties of the ground, the London Clay was assumed to behave as a linear elastic isotropic porous material having a stiffness that varies with depth.