scholarly journals Numerical investigation in detection of prestress losses in prestressed concrete slab by modal analysis

2018 ◽  
Author(s):  
Andrejs Kovalovs ◽  
Pavel Akishin ◽  
Sandris Ruchevskis
Keyword(s):  
Modal Analysis ◽  
Numerical Investigation ◽  
Prestressed Concrete ◽  
Concrete Slab ◽  
Prestress Losses

Comparison of Prestressed Concrete Railway Sleepers and New LCR Concrete Sleepers with Experimental Modal Analysis

2021 ◽  
pp. 105821
Author(s):  
Bekir AKTAŞ ◽  
Ferhat ÇEÇEN ◽  
Hakan ÖZTÜRK ◽  
Burhan M. NAVDAR ◽  
İrfan Ş. ÖZTÜRK
Keyword(s):  
Modal Analysis ◽  
Prestressed Concrete ◽  
Experimental Modal Analysis

scholarly journals Embodied Energy Optimization of Prestressed Concrete Slab Bridge Decks

Technologies ◽  
2018 ◽  
Vol 6 (2) ◽  
pp. 43 ◽  
Author(s):  
Julián Alcalá ◽  
Fernando González-Vidosa ◽  
Víctor Yepes ◽  
José Martí
Keyword(s):  
Prestressed Concrete ◽  
Concrete Slab ◽  
Bridge Decks ◽  
Energy Optimization ◽  
Embodied Energy

scholarly journals Warped Accretion Discs

2003 ◽  
Vol 208 ◽  
pp. 385-386
Author(s):  
D. Chakrabarty ◽  
J. Murray ◽  
G.A. Wynn ◽  
A.R. King
Keyword(s):  
Magnetic Field ◽  
Modal Analysis ◽  
Numerical Investigation ◽  
Fourier Transforms ◽  
Small Difference ◽  
Accretion Discs ◽  
Stellar Systems ◽  
Hydrodynamic Simulations ◽  
Companion Star ◽  
The Magnetic Field

In this article we report the results of our numerical investigation of warped accretion discs in binary stellar systems. We perform complete 3-D hydrodynamic simulations of binary discs. The disc is rendered unstable to the warp mode under the action of the magnetic field of the companion star in the binary. The disc thus warped is noted to undergo retrograde precession with a precession period just slightly less than the binary period. This small difference in periods can explain the phenomenon of negative superhumps observed in a number of binaries. Besides the modal analysis based on Fourier transforms, warps were also studied by a simple and robust technique that we developed; this is based on an analysis of the azimuthal distributions of particles that lie above and below the mid-plane of the disc.

Prestress Loss Measurements in Missouri's First Fully Instrumented High-Performance Concrete Bridge

2005 ◽  
Vol 1928 (1) ◽  
pp. 118-125 ◽  
Author(s):  
Yumin Yang ◽  
John J. Myers
Keyword(s):  
Prestressed Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Concrete Bridge ◽  
Prestress Loss ◽  
Prestress Losses ◽  
Concrete Girders ◽  
Allowable Stresses ◽  
Loss Estimate

Prestress losses have a direct impact on concrete stress development and deflection behavior of highway bridge members. A poor estimate of prestress losses can result in a structure in which allowable stresses are exceeded or camber and deflection behavior is poorly predicted, such that the serviceability of a structure may be adversely affected. This paper reports the prestress losses observed throughout fabrication, shipment, erection, and the first 2 years of service for the first high-performance superstructure concrete bridge in Missouri. The prestress losses investigated included prerelease losses, elastic shortening losses, relaxation losses, creep losses, and shrinkage losses. Results from the study were compared with eight commonly used loss estimate models for total prestress losses, including AASHTO and Prestressed Concrete Institute methods. Recommendations were proposed by the authors for the most appropriate methodology to use to predict prestress losses in high-strength concrete girders accurately.

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