tie requirements for prestressed concrete columns
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Tie Requirements for Prestressed Concrete Columns

2018-11-1  ties in prestressed concrete columns. Placing lateral ties is a labor intensive and time consuming activity which de-creases productivity. Columns could be cast faster and more economically if tie requirements were more liberal. On the other hand, if lateral reinforcement is found to be beneficial, fabricating tech-niques might be adjusted ...

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TIE REQUIREMENTS FOR PRESTRESSED CONCRETE

TIE REQUIREMENTS FOR PRESTRESSED CONCRETE COLUMNS. EXECUTIVE SUMMARY REPORT. Conclusion to be drawn from this study are directly applicable to the test parameters considered, namely square prestressed concrete columns with a slenderness, L/d, in the range of 20 to 30, laterla tie spacings in the range of 1/2 to 2 times the column width, and concrete strength in the

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Tie Requirements for Reinforced Concrete Columns

The American Concrete Institute. Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design ...

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Concrete column tie requirements - Structural engineering ...

2007-8-23  This way you can provide circular ties and no cross ties will be needed per ACI 318. This may save you some money. miecz (Structural) 23 Aug 07 11:21 AASHTO LRFD 5.10.6.3 requires the 6" maximum for columns designed for plastic hinging, such as for Seismic Zones 2, 3, and 4.

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Recommended Practice for the Design of Prestressed ...

2018-11-1  3.1 Prestressed concrete columns and walls must be designed for all the forces to which they are subjected and their behavior should be considered with re- spect to lateral displacement, end con- ditions, repetitive loading, axial short- ening, effects of creep, shrinkage, tem- perature changes, foundation settle- ment, cracking, construction or handling loads and required strength.

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STRUCTURE magazine Recommended Details for

Requirements for columns with tie reinforcement are given in ACI 318 Sections 10.7.6 and 25.7.2, and standard hook dimensions for ties are given in ACI Section 25.3.2. Tie spacing requirements for reinforced concrete columns in buildings assigned to SDC A and B are given in Figure 3. The clear spacing between ties must be at least (4/3) dagg.

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CECALC - Reinforced Concrete Column Design

(Note: the maximum practical tie size is usually no. 5.) The concrete cover must be at least 1.5 in (3.81 cm) over the outermost surface of the tie steel. At least four longitudinal bars are needed for columns with square or circular ties.

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7.4 Column Reinforcement

2014-4-10  For precast prestressed concrete girder bridges in SDCs C and D with two-stage fixed diaphragms at intermediate piers, all column longitudinal reinforcement should extend to the top of the cast-in-place concrete diaphragm (upper crossbeam) above the lower crossbeam. Careful attention should be given that column reinforcement does not interfere with extended strands projecting from the end of the prestressed concrete girders. In case of interference, column longitudinal reinforcement obstructing the extended strands may be terminated at top of the lower crossbeam, and shall be replaced with equivalent full-height stirrups extending from the lower to upper crossbeam within the effective width as shown in Figure 7.4.4-1. All stirrups within the effective zone, based on an approximate strut-and-tie model, may be used for this purpose. The effective zone shall be taken as column diameter plus depth of lower crossbeam provided that straight column

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Detailing Concrete Columns - construccionenacero

2016-8-17  Although column cages are always shown on the design and placing drawings in their proper vertical orientation, they are almost always assembled horizontally on the ground on horses (Fig. 4). The cage is then hoisted into place. To ensure the ironworker properly constructs the cage, the first and last ties must be properly located at the ends of the cage while it’s being fabricated on the ground. Referencing the tie location relative to a floor elevation or a beam soffit is meaningless to the ironworker at this stage because these control points are nowhere to be found on the cage while it’s being built. The Detailer will thus provide distances from the end ties to the ends of the longitudinal bars, as shown in Detail A in Fig. 5. Once the location of these key end ties has been established, the remaining ties

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Vertical Spacing of Column Ties - ACI (concrete) Code ...

2006-5-24  24 May 06 12:10. I have a semi-circle column, 14" in diameter supporting a balcony slab. The equivalent circular compression member for this column shape is adequate to carry the design load. ACI 318 (7.10.5.2) states that the vertical spacing of the ties should not exceed the least dimension of the compression member, i.e., 7" for this matter.

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Why column ties are used in reinforced concrete columns ...

2021-8-19  In reinforced concrete structure ties are used in columns.There are several reasons for using ties. The following are the main reasons behind using ties in the column. To hold the longitudinal bars in position in the forms while the concrete is being placed.; To prevent the highly stressed slender longitudinal bars from buckling outward by bursting the thin concrete

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STRUCTURE magazine Recommended Details for

Requirements for columns with tie reinforcement are given in ACI 318 Sections 10.7.6 and 25.7.2, and standard hook dimensions for ties are given in ACI Section 25.3.2. Tie spacing requirements for reinforced concrete columns in buildings assigned to SDC A and B are given in Figure 3. The clear spacing between ties must be at least (4/3)d agg ...

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7.4 Column Reinforcement

2014-4-10  For precast prestressed concrete girder bridges in SDCs C and D with two-stage fixed diaphragms at intermediate piers, all column longitudinal reinforcement should extend to the top of the cast-in-place concrete diaphragm (upper crossbeam) above the lower crossbeam.

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Detailing Concrete Columns - construccionenacero

2016-8-17  If the tie spacing is tight and the mechanical splice device length exceeds the tie spacing, shifting and/or adding column ties may not be practical; the engineer may be notified for an alternate design. Alternately, a different tie with a larger perimeter may be required, which will result in a reduction in the side concrete cover to the tie.

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7.4 Column Reinforcement

2014-4-10  For precast prestressed concrete girder bridges in SDCs A and B with fixed diaphragms at intermediate piers, column longitudinal reinforcement may be terminated at top of lower crossbeam, provided that adequate transfer of column forces is provided. For precast prestressed concrete girder bridges in SDCs C and D with two-stage fixed diaphragms at

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PRESTRESSED CONCRETE STRUCTURES

2019-2-13  concrete (RC) without prestressing. A fully prestressed concrete member is usually subjected to compression during service life. This rectifies several deficiencies of concrete. The following text broadly mentions the advantages of a prestressed concrete member with an equivalent RC member. For each effect, the benefits are listed.

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ACI 318-14 Significant Changes - SEAoA

2015-7-17  17—Composite Concrete Flexural Members 18—Prestressed Concrete 19—Shells And Folded Plate Members 20—Strength Evaluation of Existing Structures 21—Earthquake-Resistant Structures 22—Structural Plain Concrete App. A—Strut-And-Tie Models App. B—Alternative Provisions For Reinforced And Prestressed Concrete Flexural

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STRUCTURE magazine Confinement of Special Reinforced ...

Given the above, confinement requirements for columns of special moment frames (Section 18.7.5, Figure 1), with high axial load (P u > 0.3A g f’ c) or high concrete compressive strength (f’ c > 10,000 psi) are significantly different in ACI 318-14.The following excerpt from Sheikh et al. explains why high-strength concrete columns are grouped with highly axially loaded columns:

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Vertical Spacing of Column Ties - ACI (concrete) Code ...

2006-5-24  24 May 06 12:10. I have a semi-circle column, 14" in diameter supporting a balcony slab. The equivalent circular compression member for this column shape is adequate to carry the design load. ACI 318 (7.10.5.2) states that the vertical spacing of the ties should not exceed the least dimension of the compression member, i.e., 7" for this matter.

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Bridge Design Guide - ftp.dot.state.tx.us

2020-1-21  Prestressed Concrete Beam and Girder Design TxDOT’s policy is held firmly to a 6.0 ksi maximum allowable concrete strength (f’ci) at time of release of prestressing tension. The most severe Alkali Silica Reaction (ASR) and ... Design beams so that they meet all requirements

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Chapter 10: Columns, Building Code Requirements for ...

For prestressed columns with average f pe ≥ 225 psi, transverse ties or hoops need not satisfy the 16d b spacing requirement of 25.7.2.1. 10.7.6.1.4 For composite columns with a structural steel core, transverse ties or hoops shall have a minimum d b of 0.02 times the greater side dimension of the composite column , but shall be at least No ...

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Detailing Concrete Columns - construccionenacero

2016-8-17  If the tie spacing is tight and the mechanical splice device length exceeds the tie spacing, shifting and/or adding column ties may not be practical; the engineer may be notified for an alternate design. Alternately, a different tie with a larger perimeter may be required, which will result in a reduction in the side concrete cover to the tie.

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Design of Deep Beam (Transfer Girder) Using Strut-and

2021-3-23  2 1. Method of Solution The Strut-and-Tie Model (STM) is a tool for the analysis, design, and detailing of reinforced concrete members. It is essentially a truss analogy, based on the fact that concrete is strong in compression, and that steel is strong in

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PRECAST CONCRETE CONNECTIONS - ies

2018-11-5  Since 2000 till now in 2018, precast concrete elements and structures world wide have become: (i) Taller (e.g. 36-storey skeletal precast frame) and 54-storey wall frame (the Netherlands) (ii) Longer (e.g. 50 m long prestressed concrete beams) (iii) Deeper (e.g. 1000mm deep prestressed hollow core floor units produced in Italy in 2014)

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Design of Prestressed Slab - PEOPLE AT UNIVERSITI ...

2017-7-13  One-way Slabs • Normally design as a beam with cables running in the direction of the span at uniform centres. • A slab strip of unit width is analysed using simple beam theory. • In any span, the max cable sag, zd depends on the concrete cover requirements and the tendon dimensions. • When zd is determined, the prestressing force required to balance an

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ACI 318-14 Significant Changes - SEAoA

2015-7-17  17—Composite Concrete Flexural Members 18—Prestressed Concrete 19—Shells And Folded Plate Members 20—Strength Evaluation of Existing Structures 21—Earthquake-Resistant Structures 22—Structural Plain Concrete App. A—Strut-And-Tie Models App. B—Alternative Provisions For Reinforced And Prestressed Concrete Flexural

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Precast, Prestressed Concrete Bent Caps: Volume 2

2018-4-5  Transportation (TxDOT) first began using precast reinforced concrete (RC) bent caps in the early 1990s. Since then, connections for precast RCbent caps have become a standard detail that offer contractors flexibility in construction in the method. To provide further options for contractors, bent caps may be prestressed.

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EXAMPLE NO.1: PRESTRESSED CONCRETE GIRDER

2021-6-16  EXAMPLE NO.1: Concrete Bridge LRFD Specifications Parsons Brinckerhoff Page 1 1. INTRODUCTION This example illustrates New Mexico Department of Transportation (NMDOT) design procedures for a three-span prestressed concrete girder bridge. Site location is assumed to be near Socorro, New Mexico, with the bridge crossing a waterway on a normal

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MINIMUM LATERAL REINFORCEMENT IN REINFORCED

2016-1-14  The provision of links in reinforced concrete columns may increase the capacity of a column in two ways, firstly by preventing buckling of the main longitudinal reinforcement and, secondly, if sufficient lateral reinforcement is provided by restraining the central core of concrete which, being in triaxial compression, can sustain a higher load.

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Precast concrete floors in steel framed buildings

2019-7-29  precast prestressed concrete floors. Although there is usually no mechanical fixing between structural topping and precast planks, the two parts can be designed to act compositely provided that the shear stress at the interface meets the requirements of clause 6.2.5 of BS EN 1992-1-1 [3].

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