By D. Michael McFarland, Alexander F. Vakakis (auth.), Tom Proulx (eds.)
This the fourth quantity of 5 from the twenty eighth IMAC on Structural Dynamics and Renewable power, 2010, brings jointly 29 chapters at the Dynamics of Civil constructions. It offers early findings from experimental and computational investigations of Civil buildings, together with reviews comparable to Characterization of a Strongly Nonlinear Laboratory Benchmark method, A Non-destructive procedure for the healthiness tracking of Tie-rods in historic structures, Estimating powerful Prestress strength on Grouted Tendon by way of impression Responses, Experimental research of Dynamic Load Estimation utilizing Small-scale trying out, and Prediction of Prestress strength on Grouted Tendon by means of Experimental Modal Analysis.
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Extra resources for Dynamics of Civil Structures, Volume 4: Proceedings of the 28th IMAC, A Conference on Structural Dynamics, 2010
6, the elastic modulus can also be relied on both the applied tension level and the mode number. This is supported by the research results of Kim and Park . Work done by Kim and Park  confirmed that a flexural rigidity of a bridge cable is proportional to the applied tension on the cable. Substituting the measured frequency listed in Table 2 and the mode number into Eq. (3), the elastic modulus of a strand can be achieved and summarized as Table 3. 779 kg/m ) of the strand. Coefficient of variation (COV) reveals that the variation of the estimated elastic modulus with respect to the modes is negligible, while it is sensitive to the applied tension level.
Estimated Elastic Modulus (GPa) of Strand Mode No. 0004 Assuming that the mass of density of concrete is 2450 kg/m , the elastic modulus of concrete has been evaluated and given in Table 4. A similar trend as the above case of a strand is achieved. In general, an estimated elastic modulus of a concrete specimen is insensitive to the mode number, while it is affected by the applied tension 23 levels. Graphical representation is given in Fig. 8 which demonstrates that normalized elastic moduli of both strand and concrete vary with the applied tension levels.
T. 1007/978-1-4419-9831-6_5, © The Society for Experimental Mechanics, Inc. 2 Experimental Modal Analysis In order to get the natural frequency of post-tensioned concrete beams according to the level of prestress force, experimental modal tests were carried out. Among the experimental modal tests, impact hammer test and MIMO(Multi Input Multi Output) sweep test were adopted to get the natural frequency of post-tensioned concrete beams. The acceleration occurring from both tests, was measured by piezo-electrical sensors.
Dynamics of Civil Structures, Volume 4: Proceedings of the 28th IMAC, A Conference on Structural Dynamics, 2010 by D. Michael McFarland, Alexander F. Vakakis (auth.), Tom Proulx (eds.)