By G. Martincek
This publication offers a rigorous therapy of the elemental, mathematical behaviour of pavement constructions less than dynamic loading. the subject is of growing to be significance in fiscal layout of airplane runways and road pavements.
summary: This ebook provides a rigorous therapy of the elemental, mathematical behaviour of pavement buildings less than dynamic loading. the subject is of turning out to be value in financial layout of airplane runways and street pavements
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Extra resources for Dynamics of Pavement Structures
37 for loess and in Figs. 42 for bentonite. Fig. 33. Relationship of complex modulus |G*| to frequency, for loess. Fig. 34. Relationship of complex modulus |E*| to frequency, for loess. Dynamic diagnosis of pavement structures 41 Fig. 35. Evolution of |G*| and |E*| over time after compacting, for loess. Fig. 36. Evolution of stress-wave velocities c2 and c0 over time after compacting, for loess. 42 Dynamics of Pavement Structures Fig. 37. Evolution of damping parameter δ and Poisson’s ratio μ over time, for loess.
Curves of phase angle φ versus frequency parameter nl. The variations of phase angle φ depending on the frequency parameter nl in Fig. 14 present intense changes at the zone of resonance and anti-resonance frequencies. The phase angles and their differences depend on the damping factor δ. 38) where l is half the element length. 38) is valid for the elementary theory without the influence of shear and rotational inertia. By the same procedure as for a cantilever element the variations of the functions |Z*|(nl) and φ(nl) can be prepared.
Pokorny, which has been used for application to cantilever samples and flexural vibration is shown in Fig. 17. The sine-wave signal from an automatic generator leads to the power amplifier and electrodynamic vibrator. The vibration is transferred through the impedance head into the test specimen. The impedance head gives the possibility of measuring the amplitude of the force by using a preamplifier and voltmeter and recording the variation in the force amplitude with frequency. Fig. 17. Block diagram of experimental arrangement for mechanical impedance method.
Dynamics of Pavement Structures by G. Martincek