load testing of prestressed concrete double tees without

Load Testing of Prestressed Concrete Double Tees Without ...

The paper concludes with appropriate recommendations related to the omission of web reinforcement in prestressed concrete double tees of similar geometry. References. 1. ACT Committee 318, “Building Code Requirements for Structural Concrete (ACI 3 18-02) and Commentary (ACT 318R-02),” American Concrete Institute, Farmington Hills, MI, 2002. 2.

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Load Testing of Prestressed Concrete Double Tees

omission of web reinforcement in prestressed concrete double tees of similar geometry. T he pretopped double tee is a very common precast, prestressed concrete product in North America. The recent ACT 318-02 Building Code requirements for load and —factors, the impact of bottom tensile stress, es peciajy for the Class T category under Section ...

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LOAD TESTING OF PRESTRESSED CONCRETE DOUBLE TEES

LOAD TESTING OF PRESTRESSED CONCRETE DOUBLE TEES WITHOUT WEB REINFORCEMENT. Under the current ACI 318-02Code, the load combination for ultimate strength for prestressed concrete double tees is 1.2D + 1.6L. Described in this paper are three static load tests conducted on full-scale pretopped 12DT30 double tees.

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Load Testing of a Precast Concrete Double-Tee Flange

in precast, prestressed concrete con-struction, only a very limited amount of testing has been conducted to pro-vide an adequate basis for their de-sign. Furthermore, the performance of precast double-tee diaphragms in the 1994 Northridge Earthquake in Cali-fornia and other recent seismic events has raised fundamental questions re-

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DOUBLE TEES - Technical Data

CONCRETE RELEASE STRENGTH and TOP FLANGE TENSION REINFORCEMENT requirements have been checked for conformance to ACI 318- 89, Section 18.4.1, and are reflected in the Span-Load Tables. CONCRETE STRENGTH varies depending on the total amount of prestress and the length of the Double Tees.

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Strength to a Double Tee - National Precast Concrete ...

Oct 13, 2014  Stresscon of Colorado Springs supplied the 10-ft-wide, 60-ft-long double tee for the demonstration. The double tee was loaded to service level, 85%, ultimate, 110% and failure. Testing procedures closely followed those found in Chapter 20 of ACI 318, “Building Code Requirements for Structural Concrete,” except for the 24-hour applied load ...

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New generation of precast concrete double tees reinforced ...

chamber and on the top surface of the double tee. A small gap (nominal 1.5 in. [40 mm]) was maintained between the edges of the double-tee flange and the chamber walls to maintain a uniform load distribution on the double tee. Each double-tee specimen was supported along the length of its two stems by wooden blocks resting on concrete blocks.

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Precast Lin Tees (Single Tee not Double Tee precast planks ...

Jul 21, 2011  I have "Prestressed Concrete" by Edward Nawy. On page 19 and 20 he gives an example calc for an 8'-0" wide Tee with 8" stem. However, that's not going to help you unless you have more info (concrete strength, tendon stress, qty and size, concrete topping, etc...). I would think your best bet is to load test.

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Case Studies in Structural Repair of Pretensioned Concrete ...

OVER-LOAD SHEAR CRACKS A double tee at a water treatment basin in Detroit, Michigan failed (see Fig. 2). The double tees were required to support soil for a golf course. The double tee did not collapse but I in. (25 mm) wide shear cracks formed (see Fig. 5). There were three reasons why the beam failed. First, the top of the dou­

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10 FOOT WIDE DOUBLE TEE - Concrete Tech

CONCRETE STRENGTH varies depending on the total amount of prestress and the length of the double tees. The span-load charts assume that double tees will have a 28-day compressive strength of 8,000 psi, with a release strength that varies based on the the required amount of prestressing. The strength of the topping at 28-days is a minimum of ...

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Strength to a Double Tee - National Precast Concrete ...

Oct 13, 2014  Stresscon of Colorado Springs supplied the 10-ft-wide, 60-ft-long double tee for the demonstration. The double tee was loaded to service level, 85%, ultimate, 110% and failure. Testing procedures closely followed those found in Chapter 20 of ACI 318, “Building Code Requirements for Structural Concrete,” except for the 24-hour applied load ...

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Design of CFRP pre-stressed double-tee girders and ...

A load test was performed at the ... Non-prestressed reinforcement used for the construction of the DTs comprises basalt fibers with ... Cross section of the double tee with concrete topping and curb (measures in mm). Figure 2. Plan view of the Double Tee 1 (measures in m).

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Technical Information Stresscon

Report on Elimination of Shear Reinforcement in Prestressed Double-tees: “As a continuation of a test program begun in 1975, a static load test was conducted on a full-size topped (composite) 10′-8″ wide 24″ deep double tee spanning 56′-6”. The test specimen was a typical parking garage. The objective of the test was to demonstrate the shear reinforcement in tee stems can be ...

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STRUCTURE magazine Load Testing of Concrete Structures

Part 2: Test Protocols and Case Studies. As discussed in Load Testing of Concrete Structures – Part 1 (STRUCTURE ® magazine, April 2014), load testing can be used to determine the ability of a structure to carry additional loads, to establish the safety of structures, to validate strengthening, to gain knowledge on the behavior of a structure, and to supplement, validate or refine ...

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Prestressed Double Tee Floor - Concrete Engineering ...

Oct 18, 2012  I am trying to evaluate (for proposed loading) 14” double tee floor sections on an existing laboratory built in 1965. A Louisville,KY local firm, Dolt Dew (which is out of business) fabricated them. I have searched the load tables in the 1971 PCI handbook but cannot seem to find any double tees that match the dimensions that we have.

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Troubleshooting precast cracking in double tees T

and Shipment Cracks in Prestressed Hollow-Core Slabs and Double Tees,” prepared by the Precast/Pre-stressed Concrete Institute’s Com-mittee on Quality Control Perfor-mance Criteria. It originally appeared in the January/February 1983 issue of the PCI Journal and is reprinted with permission. Troubleshooting precast cracking in double tees ...

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Dr. Craig Newtson, Ph.D., P.E. Civil Engineering New ...

“Load Rating a Prestressed Concrete Double Tee-Beam Bridge without Plans,” Compendium of Papers from the 94 th Annual Meeting of the Transportation Research Board, Transportation Research Board, Paper 15-1302, Jan. 11-15, Washington D.C.

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Precast Lin Tees (Single Tee not Double Tee precast planks ...

Jul 21, 2011  I am looking at existing structural drawings for a building in Maryland and they indicate 8L36 Lin Tees. Not knowing what they were, I discovered that Lin Tees are single Tee precast concrete planks, similar to double tees today, only that they are single tees, developed by a guy with the last name "Lin", believe it or not, in 1962.

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Capacity of Existing Precast Double Tees - Structural ...

Aug 11, 2008  I am trying to verify the load capacity of an existing precast double-tee floor in an educaton building for the addition of equipment. The building was constructed in 1963. The double tees are 14" overall depth, 4' wide flange, stems at 2' spacing, spanning 33'-0" with a 2.5-inch concrete topping. The tees are referred to as LEAP #14-DTF-87C ...

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STRUCTURE magazine Repairs to Prestressed Strands in ...

The second garage was a 1971 structure with lightweight concrete double-tees. In the 1971 structure, the main findings at the damaged stem included a crack that developed near midspan of an 86-foot long, 24 LDT double-tee. The crack measured about ¼ inches wide at the bottom and gradually narrowed to zero near the stem-to-flange intersection.

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Substantial Openings in Double Tee - Structural ...

May 22, 2018  Saleh, M. A., Brady, P. A., Einea, A., and Tadros, M. K., Design and Performance of Prestressed Precast Reinforced Concrete Double-Tee Beams with Web Openings, U.S. Army Corps of Engineers, USACERL Technical Report 97, April 1997 I also found this in the CPCI Design Manual and the PCI Design Handbook: The PCI equivalent is B t + 2 inches.

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Experimental behavior of the shear strength of full-scale ...

The shear failure load was also calculated for the two kinds of double tees based on the concrete design code. It is difficult to transport double tees to the lab because of their large size and weight. Therefore, a special loading system was provided on the production site, as shown in Fig. 3. A self-balanced static test loading system ...

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State-of-the-art on load testing of concrete bridges ...

Nov 01, 2017  Aguilar CV, Jáuregui DV, Newtson CM, Weldon BD, Cortez TM. Load rating a prestressed concrete double-tee beam bridge without plans by proof testing. In: Transportation research board annual compendium of papers. Washington DC; 2015. p. 19.

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InnovatIve Double-tee RepaIR SolutIon

Common repair concepts for a failed prestressed tendon within a double-tee stem include external post-tensioning of the double-tee stem to restore its capacity or reducing the span of the distressed double-tee by the addition of new columns. For this project, the installation of new columns was not possible because the clear span of the double-tee

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Design of CFRP pre-stressed double-tee girders and ...

A load test was performed at the ... Non-prestressed reinforcement used for the construction of the DTs comprises basalt fibers with ... Cross section of the double tee with concrete topping and curb (measures in mm). Figure 2. Plan view of the Double Tee 1 (measures in m).

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Load Testing of Prestressed Concrete Double Tees Without ...

Información del artículo Load Testing of Prestressed Concrete Double Tees Without Web Reinforcement ... Load Testing of Prestressed Concrete Double Tees Without Web Reinforcement. Autores: N. M. Cleland, A. Aswad, G. Burnley; Localización: PCI journal: Prestressed Concrete Institute Journal, ISSN 0887-9672, Nº. 2, 2004, págs. 66-77; Idioma ...

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InnovatIve Double-tee RepaIR SolutIon

Common repair concepts for a failed prestressed tendon within a double-tee stem include external post-tensioning of the double-tee stem to restore its capacity or reducing the span of the distressed double-tee by the addition of new columns. For this project, the installation of new columns was not possible because the clear span of the double-tee

get price

State-of-the-art on load testing of concrete bridges ...

Nov 01, 2017  Aguilar CV, Jáuregui DV, Newtson CM, Weldon BD, Cortez TM. Load rating a prestressed concrete double-tee beam bridge without plans by proof testing. In: Transportation research board annual compendium of papers. Washington DC; 2015. p. 19.

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Prestressed Double Tee Floor - Concrete Engineering ...

Oct 18, 2012  I am trying to evaluate (for proposed loading) 14” double tee floor sections on an existing laboratory built in 1965. A Louisville,KY local firm, Dolt Dew (which is out of business) fabricated them. I have searched the load tables in the 1971 PCI handbook but cannot seem to find any double tees that match the dimensions that we have.

get price

Precast Lin Tees (Single Tee not Double Tee precast planks ...

Jul 21, 2011  I am looking at existing structural drawings for a building in Maryland and they indicate 8L36 Lin Tees. Not knowing what they were, I discovered that Lin Tees are single Tee precast concrete planks, similar to double tees today, only that they are single tees, developed by a guy with the last name "Lin", believe it or not, in 1962.

get price

Dr. Craig Newtson, Ph.D., P.E. Civil Engineering New ...

“Load Rating a Prestressed Concrete Double Tee-Beam Bridge without Plans,” Compendium of Papers from the 94 th Annual Meeting of the Transportation Research Board, Transportation Research Board, Paper 15-1302, Jan. 11-15, Washington D.C.

get price

STRUCTURE magazine Repairs to Prestressed Strands in ...

The second garage was a 1971 structure with lightweight concrete double-tees. In the 1971 structure, the main findings at the damaged stem included a crack that developed near midspan of an 86-foot long, 24 LDT double-tee. The crack measured about ¼ inches wide at the bottom and gradually narrowed to zero near the stem-to-flange intersection.

get price

Troubleshooting precast cracking in double tees T

and Shipment Cracks in Prestressed Hollow-Core Slabs and Double Tees,” prepared by the Precast/Pre-stressed Concrete Institute’s Com-mittee on Quality Control Perfor-mance Criteria. It originally appeared in the January/February 1983 issue of the PCI Journal and is reprinted with permission. Troubleshooting precast cracking in double tees ...

get price

Substantial Openings in Double Tee - Structural ...

May 22, 2018  Saleh, M. A., Brady, P. A., Einea, A., and Tadros, M. K., Design and Performance of Prestressed Precast Reinforced Concrete Double-Tee Beams with Web Openings, U.S. Army Corps of Engineers, USACERL Technical Report 97, April 1997 I also found this in the CPCI Design Manual and the PCI Design Handbook: The PCI equivalent is B t + 2 inches.

get price

Experimental behavior of the shear strength of full-scale ...

The shear failure load was also calculated for the two kinds of double tees based on the concrete design code. It is difficult to transport double tees to the lab because of their large size and weight. Therefore, a special loading system was provided on the production site, as shown in Fig. 3. A self-balanced static test loading system ...

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STRUCTURE magazine Cutting Prestressed Concrete Framing

The perimeters of double-tee (DT) beams typically contain diaphragm reinforcement necessary to transfer the in-plane wind and seismic loads to the building’s lateral-load-resisting system (LLRS). Typically, chord reinforcement is located at each end, and collector reinforcement is present where the PC element connects to the LLRS.

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Lateral Connections for Double Tee Bridges

The prestressed concrete double tee bridge is a potentially attractive structure for short to medium range spans where speed of construction is an issue. Additionally, it may be a viable alternative to the pan form bridge for use on off-system roads as the cost of

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Shear Reinforcement Requirements for Precast Prestressed ...

The minimum shear reinforcement requirements of the ACI Building Code (Section 11.5.5), as they apply to precast, prestressed double-tee units, are examined in this paper. The results of load tests on double-tees, as well as the performance record of double-tees without the code required minimum shear reinforcement, which have been used in ...

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