1,068 research outputs found
Use of a passing vehicle to scan the fundamental bridge frequencies: An experimental verification
No full textA two-wheel cart towed by a light truck is used to scan the fundamental frequency of vibration of a sustaining bridge. The truck excites the bridge through its movement, thereby serving as an exciter to the bridge. The bridge vibration is received or scanned by an accelerometer installed in the cart. The bridge that is set into motion will affect the dynamic response of the towed cart, which in turn serves as a receiver or scanner of the bridge’s dynamic properties, especially the frequencies of vibration. The response recorded using an accelerometer installed in the cart is processed by a fast Fourier transform (FFT) to extract the “source” frequencies of the cart, which are exactly the frequencies of vibration of the bridge. The feasibility of scanning the fundamental frequency of the bridge using the towed cart is confirmed by field tests. The methodology developed for the first time herein is simple and efficient, and can be applied to a wide range of bridge problems, if only the fundamental frequency is of interest
Solution strategy and rigid element for nonlinear analysis of elastically structures based on updated Lagrangian formulation
No full textInelastic Thermal Analysis of Preloaded Steel Trusses Undergoing Heating and Cooling Stages
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Consistent virtual work approach for the nonlinear and postbuckling analysis of steel frames under thermal and mechanical loadings
No full textUtilization of Fiber Bragg Grating Sensors to Monitor the Performance of High Strength Concrete at Elevated Temperature
No full textNumerical simulation of semicrystalline nylon 6: elastic constants of crystalline and amorphous parts
Full text linkThe elastic responses of crystalline and amorphous parts in semi-crystalline nylon 6 are determined by computer simulation using the finite element method. Semi-crystalline nylon 7 is modelled as a composite consisting of alternating layers of lamellar crystals and amorphous regions. Full morphological details identified by Lin and Argon in their highly textured nylon 6 bulk samples are incorporated in the model. An optimization scheme is employed to systematically search for the individual components' elastic constants which give rise to a composite elastic behavior as that measured by Lin and Argon. A two-dimensional plane strain finite element analysis is performed to evaluate the composite elastic behavior for given set of constituents' elastic constants. The resulted elastic constants of semi-crystalline nylon 6 for the optimized values of crystalline and amorphous elastic properties are within 6% average error with the experimental data. The computations also reveal that high stress concentration exists in the crystalline region. Therefore, experimental measurements of plastic resistance may represent a significant underestimate of the intrinsic critical resolved shear strength of polymer crystals.Made available in DSpace on 2021-11-04T16:28:22Z (GMT). No. of bitstreams: 2
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Previous issue date: 1993-0
In-vitro effects of dexamethasone on cellular proliferation, apoptosis, and Na -K -ATPase activity of bovine corneal endothelial cells
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