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عنوان فارسی مقاله:
کاهش تحکیم تیرهای فلنجد ریخته گری با بتن خودمتراکم سبک
عنوان انگلیسی مقاله:
Prestress losses of double-tee girders cast with lightweight self-consolidating concrete
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Pretensioned concrete members are widely used in the construction of buildings, parking garages, and bridges. Prestress losses occur throughout the life of pretensioned concrete members, and have significant impact on the design for long-term effects [1–4]. In the design period, structural engineers rely on the existing empirical formulas to calculate prestress losses. The variability in predicting prestress losses directly causes the inaccuracy in estimating the camber and long-term deflection of pretensioned concrete members. At erection, the under- or overestimation of camber increases the possibility of construction-related problems, which increases the construction cost, delays the project, or affects the structural performance. The inaccuracy in predicting the long-term deflection reduces the riding quality if the deflection is over-estimated, or rises the public concern and affects the structural durability if the deflection is underestimated. The use of self-consolidating concrete (SCC) for pretensioned concrete members is advantageous when compared to conventional or vibrated concrete. The fresh SCC has high flowability and deformability, so it can flow through narrow regions and fill the formwork by its self-weight without segregation or bleeding. This feature particularly benefits at the anchorage zone of pretensioned concrete members that normally contain congested reinforcement, or thin elements like double-tee girders that are widely used in the United States [5]. The use of lightweight aggregates in SCC offers further advantages for the concrete technology [6–8]. First, the use of lightweight concrete can reduce the self-weight of structures up to 20%, which decreases the dimensions of concrete members and vertical load on foundations [6,9]. Second, internal curing techniques can be employed for lightweight concrete to enhance the durability and resilience of concrete structures [10–14]. In summary, the use of lightweight SCC not only furthers the advantages of SCC but also improves the long-term performance for pretensioned concrete members. The use of lightweight SCC in pretensioned concrete members may present several challenges. First, lightweight SCC contains a high volume of paste, which may increase concrete shrinkage and affect time-dependent losses [15]. The high flowability of lightweight SCC may also reduce the concrete stiffness at the interface of prestressing strands and concrete, which consequently weakens the bond between the two materials [15–23]. Second, the reduced stiffness of lightweight aggregates decreases concrete stiffness,
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کلمات کلیدی:
Prestress Losses of Double-Tee Girders Cast with Lightweight Self ... https://www.researchgate.net/.../303866788_Prestress_Losses_of_Double-Tee_Girders_... Official Full-Text Publication: Prestress Losses of Double-Tee Girders Cast with Lightweight Self-consolidating Concrete on ResearchGate, the professional ... Shear Strength of a Lightweight Self-Consolidating Concrete Bridge ... ascelibrary.org/doi/abs/10.1061/(ASCE)BE.1943-5592.0000096 by BZ Dymond - 2009 - Cited by 6 - Related articles Shear Strength of a Lightweight Self-Consolidating Concrete Bridge Girder ... precast bulb-tee LWSCC beam and a lightweight concrete cast-in-place deck. Shear Strength of a PCBT-53 Girder Fabricated with Lightweight, Self ... https://vtechworks.lib.vt.edu/handle/10919/35949 by BZ Dymond - 2007 - Cited by 17 - Related articles Nov 29, 2007 - One PCBT-53 girder was fabricated with lightweight, self-consolidating concrete. An additional composite cast-in-place lightweight concrete ... Prestress losses of double-tee girders cast with lightweight self ... iranarze.ir/wp-content/uploads/2017/02/E3669.pdf Jun 7, 2016 - self-consolidating concrete (SCC). This study measures prestress losses for two full-scale double-tee girders cast with sand-lightweight SCC. [PDF]Bridge with Lightweight Self-Consolidating Concrete - The Virginia ... vtrc.virginiadot.org/BriefDetails.aspx?Id=62 Known as lightweight self-consolidating concrete, it has a low ratio of water to .... Eight lightweight self-consolidating concrete bridge beams, cast in early August ... Performance of Prestressed Girders Cast with ... - TRID Database https://trid.trb.org/view.aspx?id=1246284 by JC Bymaster - 2012 Mar 20, 2013 - While much research has been performed on lightweight concrete and self-consolidating concrete (SCC), the knowledge of prestress losses in ... [PDF]Shear Capacity of Prestressed Lightweight Self-Consolidating Concrete scholarworks.uark.edu/cgi/viewcontent.cgi?article=1016&context=cveguht by MA Wyssmann - 2014 - Related articles lightweight self-consolidating concrete (LWSCC) in prestressed beams. ... The shear strength of prestressed concrete members cast with normal weight self-. Prestress losses of double-tee girders cast with lightweight self ... https://www.infona.pl/.../bwmeta1.element.elsevier-8abcc4cb-0f1b-36fa-aed0-d5a8e319... by DB Ward - 2016 - Related articles ... cast with lightweight self-consolidating concrete (SCC). This study measures prestress losses for two full-scale double-tee girders cast with sand-lightweight ...
