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عنوان انگلیسی مقاله:
Effect of concrete compressive strength on transfer length
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Introduction Prestressed concrete has been used extensively since the 1950s. Many buildings and bridge structures utilize its principles, especially pre-cast structures. In the design of pretensioned members, there is a particular focus on the length a strand must be embedded in the concrete in order to develop its bond strength. Transfer length refers to the strand length required to transfer the initial prestress in the strand to the concrete. The ACI 318 Building Code and Commentary (hereafter referred to as ACI 318-14) [1] and the AASHTO Load and Resistance Factor Design (LRFD) [2] Specifications (hereafter referred to as AASHTO) provide equations to estimate transfer length. The equation is a function of the effective prestress ( fse) and the strand diameter (db) [1–3]. Investigators have shown that initial prestress ( fsi), and concrete compressive strength both at prestress release ( f′ci) and at 28-days ( f′c), contribute to transfer length [3–8]. With the changes occurring regarding concrete mixture proportioning and properties, researchers have and are questioning the accuracy of the ACI 318-14 and AASHTO equations. In these design codes, concrete compressive strength is not a variable in the transfer length equations even though it has been shown to affect bond [8–10]. For example, the transfer length for high strength concrete members is less than that predicted by ACI 318-14 and AASHTO [5,6,11]. Transfer length is an important parameter in shear design and in determining allowable stresses. An incorrect estimation of this length can affect the shear capacity of a member and may result in serviceability issues that occur in the end zones at strand release [10,12]. Therefore, there is a need to better estimate transfer length and this can be accomplished by incorporating concrete compressive strength in the transfer length equation.
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کلمات کلیدی:
Influence of Concrete Compressive Strength on Transfer and ... search.proquest.com/openview/ae4d936114520c2d31b4d35cfed3ac8c/1?pq...y by AT Ramirez-Garcia - 2016 Influence of Concrete Compressive Strength on Transfer and Development Lengths of Prestressed Concrete. Abstract. This research examines the relationship ... [PDF]Influence of Concrete Compressive Strength on Transfer and ... scholarworks.uark.edu/cgi/viewcontent.cgi?article=3309&context=etd by AT Ramirez-Garcia - 2016 Influence of Concrete Compressive Strength on Transfer and Development Lengths of. Prestressed Concrete. A dissertation submitted in partial fulfillment. [PDF]Influence of Concrete Strength On Strand Transfer Length www.pci.org/uploadedFiles/Siteroot/Publications/PCI.../JL-63-OCTOBER-5.pdf by PH Kaar - 1963 - Cited by 105 - Related articles little influence on transfer length for strands of up to lh-in. diameter. Periodic measurements were made of the concrete compressive strains in all specimens ... [PDF]INVESTIGATION OF TRANSFER LENGTH, DEVELOPMENT LENGTH ... https://ntl.bts.gov/lib/37000/37100/37128/03-CR20.pdf by A NASSAR - 2003 - Cited by 3 - Related articles 4. Title and Subtitle. Investigation of Transfer Length, Development Length, Flexural Strength, and Prestress Losses in Lightweight Prestressed Concrete Girders. [PDF]Bond Strength and Transfer Length of Pre-tensioned Bridge Girders ... digitalcommons.unomaha.edu/cgi/viewcontent.cgi?article=1001&context... by AFM Girgis - 2005 - Cited by 34 - Related articles in sec may adversely affect its early compressive strength and its bond strength with ... bond strength, transfer length, or development length when using SCC. Experimental Evaluation of Transfer Length in Pretensioned Concrete ... ascelibrary.org/doi/full/10.1061/%28ASCE%29ST.1943-541X.0001567 High-strength PS strands with an ultimate tensile strength of 2,400 MPa have ... on the effect of high-strength PS strands on the transfer length of PSC beams. Transfer and Development Length of 15.2 MM (0.6 in.) Diameter ... https://ctr.utexas.edu/wp-content/uploads/pubs/580_2.pdf by SP Gross - 1995 - Cited by 40 - Related articles All four tests resulted in flexural failures, such that the development length of the strands ... Design and Construction of Extra-High Strength Concrete Bridges.
