Results 11 to 20 of about 943 (198)
Fully-compliant statically-balanced mechanisms without prestressing assembly: concepts and case studies [PDF]
Mechanical Sciences, 2011 The purpose of this paper is to present new concepts for designing fully-compliant statically-balanced mechanisms without prestressing assembly. A statically-balanced compliant mechanism can ideally provide zero stiffness and energy free motion like a ...
G. Chen, S. Zhang
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Applied Sciences, 2022 To control the level of tensile stress in the section of reinforced concrete arch cantilever construction, a construction control method of temporary prestressing reinforcement is proposed in this study. The influence law of temporary prestressing on the
Zhongchu Tian +5 more
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Influence of changes in the prestress force on dynamic specifications of the prestressed concrete beam [PDF]
Numerical Methods in Civil Engineering, 2020 Pre-stress techniques tend to increase cross-sectional capacity and optimize design. Such features have made these techniques rather popular. Over time, these structures tend to fail, and the reduction of pre-stress force over the lifetime of the structure is said to be one of the most significant destructive factors in these structures.
Behrouz Babakhani, Hossein Rahami
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Influence of the Distribution and Level of Post-Tensioning Force on the Punching Shear of Flat Slabs
Designs, 2022 Punching shear is the most common failure mechanism of slabs that are supported directly on columns. The slab–column connection is always vulnerable to critical punching shear; thus, it is necessary to investigate the effect of various parameters on the ...
Sarah S. Elsheshtawy +3 more
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Strains, thermal relaxation and strength loss of prestressing steel at fire temperature. Guidance on the practical use of the Eurocode 2-1-2 model [PDF]
Archives of Civil EngineeringThe paper gives guidance on the use of the EC2-1-2 model of degradation of the mechanical properties of prestressing steel at high temperature useful for estimating the loss of prestressing force in members exposed to fire.
Robert Kowalski, Julia Wróblewska
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On the Evaluation of Prestress Loss in PRC Beams by Means of Dynamic Techniques
International Journal of Concrete Structures and Materials, 2018 In the last few decades, prestressing techniques have been used to build very important structures and infrastructures. Since the serviceability and the safety of prestressed reinforced concrete (PRC) elements rely on the effective state of prestressing,
Marco Breccolotti
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Identifying the Prestress Force in Prestressed Concrete Bridges Using Ultrasonic Technology
International Journal of Structural Stability and Dynamics, 2020 In this research, ultrasonic tests were performed on a prestressed concrete box-girder model to identify the prestressed force according to the acoustoelastic theory. During the tests, the ultrasonic wave was generated using piezoelectric transducers and emitted to the prestressed concrete bridge model. The concrete bridge model was subjected to three
Hussin, Manal +3 more
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Frontiers in Built Environment, 2016 Prestressed concrete bridges currently account for 45% of bridges built in the last five years in the United States. This has resulted in an increase in the number of deficient bridges composed of prestressed concrete, which requires a better ...
Hiba Abdel-Jaber, Branko Glisic
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APPLICATION OF EXTERNAL PRESTRESSING TO TIMBER-CONCRETE COMPOSITE BEAMS
Facta Universitatis. Series: Architecture and Civil Engineering, 2023 Timber-concrete composite beams are classified as modern constructions. They are created by connecting a timber and concrete element. They are designed in such a way that the concrete part of the beam is placed in the compressed zone, and the timber part
Emir Maslak +3 more
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Effective Prestress Force Estimation in Prestress Concrete Beam with Dynamical Method [PDF]
Advances in Engineering Research, 2015 The relationship between natural frequency and prestress-force is built to evaluate effective prestress-force of beams based on the theory. Two corresponding test mode beams are built up to verify the theory, the experiment results show that the natural frequency will decrease along with prestress-force decreasing, which is coincident with the result ...
Xinglin Zhou, Yuan Yan, Lanlin Zou
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