Results 161 to 170 of about 943 (198)

Calculation of P.C.P.V. prestressing forces

Nuclear Engineering and Design, 1968
Abstract An integrated system of stress analysis programs is being developed at the Berkeley Nuclear Laboratories to assess the conditions in the plant operated by the C.E.G.B., and to study the effects of long-term operation. A knowledge of the body and boundary forces sustained by a Prestressed Concrete Pressure Vessel is required to completely ...
G.D.T. Carmichael, J. Irving
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Natural frequencies of bonded and unbonded prestressed beams–prestress force effects

Journal of Sound and Vibration, 2006
Abstract The paper rigorously presents the effect of the magnitude of the prestress force on the natural frequencies of prestressed beams with bonded and unbonded tendons. A nonlinear analytical model is formulated for the dynamic behavior of prestressed beams, in order to achieve this goal.
E. Hamed, Y. Frostig
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Splitting failure of precast prestressed concrete during the release of the prestressing force

Engineering Failure Analysis, 2009
Abstract Bond between steel and concrete is fundamental for the transmission of stresses between both materials in precast prestressed concrete. Indented wires are used to improve the bond in these structural elements. The radial component of the prestressing force, increased by Poisson’s effect, may split the surrounding concrete, decreasing the ...
J.C. Gálvez, J.M. Benítez, B. Tork, M.J. Casati, D.A. Cendón   +4 more
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Electro-Mechanical Impedance-Based Prestress Force Monitoring in Prestressed Concrete Structures

2021
The motivation of this study is to present a numerical simulation for identification of the loss of prestress force in prestressed concrete structures using electro-mechanical impedance responses. In order to achieve the objective, the following approaches are implemented.
Duc-Duy Ho, Thanh-Canh Huynh, Tran-Huu-Tin Luu, Thanh-Cao Le   +3 more
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Effects of Nonsymmetrical Prestressing Forces on Torsion in Prestressed Thin-Walled Flexural Members

Journal of Engineering Mechanics, 2016
AbstractTorsional resistance of a single prestressing tendon was derived on the basis of the theorem of virtual work to control the torsional rotation by nonequal prestressing forces on both sides of the webs of a flexural member. The energy formulation revealed that the vertical component of the prestressing force has a significant role in resisting ...
Yeong-Seong Park, Yong-Hak Lee
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Residual Prestress Forces and Shear Capacity of Salvaged Prestressed Concrete Bridge Girders

Journal of Bridge Engineering, 2012
Seven prestressed concrete bridge girders that had been in service for 42 years, and represented two span lengths and reinforcement designs, were tested to determine their effective prestress force and ultimate shear capacity. A cracking moment test was used to determine the effective prestress force in the girders.
G. Parry Osborn, Paul J. Barr, David A. Petty, Marvin W. Halling, Travis R. Brackus   +4 more
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The force on a prestressed body in a curved space

Journal of Physics A: Mathematical, Nuclear and General, 1973
Exploring some aspects of the linearized theory of general relativity, the authors discover new possibilities for experimental tests. A new design for a gravitational wave detector is suggested. The starting point of these investigations is a part of newtonian mechanics whose study helps to understand some of the puzzling features of general relativity.
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Computation-Effective Method for Prestress Force and Moving Force Identification

IABSE Reports
<p>Structural health monitoring (SHM) of existing prestressed concrete bridges (PCBs) is of paramount importance due to the direct impact of failures on the safety of the bridge users. Numerous studies have been conducted to identify the existing prestress force and moving force, however, most of the methods face practical challenges and suffer ...
Kunaratnam Jeyamohan, Tommy H.T. Chan, Khac-Duy Nguyen, David P. Thambiratnam   +3 more
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Force identification of prestressed pin-jointed structures

Computers & Structures, 2011
This study deals with the problem of identifying the member forces in a prestressed pin-jointed structure. For the purpose of evaluation of the identification accuracy, we first present the formulation of identification error, where measurement errors in member forces as well as nodal coordinates are incorporated.
J.Y. Zhang, M. Ohsaki
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Monitoring Prestress Forces in a Box Girder Bridge

1990
This article presents a study of prestress losses measured directly in the field by instrumenting several tendons of an actual post-tensioned box girder bridge. The measured losses are found to be in general agreement with theoretical value but deviate from them afterward. Possible explanations for the differences are discussed.
M. “Saiid” Saiidi, Joseph Shields, Rodney Johnson   +2 more
openaire   +1 more source