demolition of posttensioned concrete
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Demolition of post-tensioned concrete

Demolition of post-tensioned concrete Safe release of stored energy requires a reverse sequence of the original construction procedures The crack in this C segment extended in length and width after the string course was complete. The crack follows the position of the

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Demolition of Post-Tensioned Concrete Concrete ...

1976-6-1  Little has been published about the demolition of post-tensioned concrete but there is enough such concrete now in service to become a problem for demolition contractors. When a demolition sequence is being planned it is important to have a knowledge of the erection procedure and a set of the as-built record drawings.

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DEMOLITION OF POST-TENSIONED CONCRETE

DEMOLITION OF POST-TENSIONED CONCRETE. The author discusses the problem of the demolition of post-tensioned concrete, using as an example the demolition of nine prestressed concrete beams and the repair of others during the construction of bridges on the M3 motorway. In this example during prestressing operations on the first three of ten 3-span ...

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Safe demolition of post-tensioned reinforced concrete ...

2018-9-24  Lack of as-built records and published papers can make safe demolition of post-tensioned structures difficult. John Riddle of Topbond explains how reverse-engineering techniques can be used to design the temporary bracing needed to contain post-tensioning forces during demolition.

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PTI DC80.1 - Controlled Demolition of an Unbonded

2002-1-1  The purpose of this report is to document a specific controlled demolition procedure of an unbonded post-tensioned concrete slab, which was executed successfully on a large project. During the demolition process the response of the tendons being neutralized was monitored and documented. The observations made arc categorized and presented.

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Post-Tensioned building demolition - Demolition ...

2016-7-17  Maybe this steel plate has some 6x6 angles at its top, so that they hook on the slab and locate the steel plate and mat. Then just lay the top half of the mat down on the slab, at the slab edge. I’ve never done this, but it should work with a little more thought and planning. RE: Post-Tensioned building demolition.

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Post-Tensioned Bridge Assessment Assessment

2015-7-7  Parametric study of the residual strength of deteriorating simply-supported post-tensioned concrete bridges Authors: D. G. Cavell , P. Waldron Source: Proceedings of the Institution of Civil Engineers - Structures and Buildings, Volume 146, Issue 4 , 1 Nov 2001 (341–352)

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STRUCTURE magazine Post-Tensioned Concrete

Once the de-tensioning and demolition are complete, the profile of the tendons can also be adjusted within the work area to address the new structural spans and geometry. Once the tendon work is finished, including the addition of new end anchorages, the concrete floor slab is recast with rebar reinforcement (Figure 3). Bonding agents help ...

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Contemporary Post-tensioned Concrete Construction ...

Controlled demolition of an unbonded post-tensioned concrete slab (PTI special report). Post-Tensioning Institute, Pheonix AZ, 34 pp. Google Scholar Bletzacker, R. W. (1967).

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Key Sustainability Benefits of Post-Tensioned Concrete

2017-12-7  tenance, repair, and demolition—all that is cradle-to-grave (or cradle-to-cradle when considering the recycling and/or reuse of a building). Different approaches during the life of a building can have a large impact on major components such as energy use. However, building materials such as concrete and PT concrete

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Demolition of Post-Tensioned Concrete Prestressed ...

2019-1-3  Demolition of. post-tensioned concrete Safe release of stored energy requires a reverse sequence of the original construction procedures. ittle has been published. L about the demolition of post-tensioned concrete but there is enough such concrete now in service to become a problem for demolition contractors. When a demolition sequence is being planned it is important to have a knowledge of ...

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Demolition of Bonded Post-Tensioned Floor System

2021-1-28  Demolition of bonded post-tensioned floor system, when the strands break, they will not immediately shrink due to the abundance of grout in the galvanized duct causing bond force between strands and concrete. This is considered an advantage of the system. Tendon placement in post-tensioned floor mostly employs band-distribute layout as

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Post-Tensioned building demolition - Demolition ...

2016-7-17  I am beginning to prepare a structural demolition plan and shoring plan for a multi-story post-tensioned structure. I have assessed the equipment the contractor will be operating on the decks, and I have designed the shoring required under the working surface before demolition of a floor may begin. But, when it comes to beginning to release ...

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364.8T-02(11) Use of Hydrodemolition for Concrete

2017-8-5  of the appropriate method of concrete removal is crucial. Hydrodemolition is not recommended for concrete removal if there is a possibility that unbonded post-tensioned systems are within the concrete removal zone. References 1. Sprinkel, M. M., “Preparing Bridge Decks for Overlays,” Concrete Repair Digest, V. 8, No. 5, 1997, pp. 242-247. 2.

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Post-Tensioned Bridge Assessment Assessment

2015-7-7  Parametric study of the residual strength of deteriorating simply-supported post-tensioned concrete bridges Authors: D. G. Cavell , P. Waldron Source: Proceedings of the Institution of Civil Engineers - Structures and Buildings, Volume 146, Issue 4 , 1 Nov 2001 (341–352)

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STRUCTURE magazine Post-Tensioned Concrete

Once the de-tensioning and demolition are complete, the profile of the tendons can also be adjusted within the work area to address the new structural spans and geometry. Once the tendon work is finished, including the addition of new end anchorages, the concrete floor slab is recast with rebar reinforcement (Figure 3). Bonding agents help ...

Get Price

Computational Modelling of a Four Storey Post

2020-10-13  uneconomical, leading to their demolition. For example, 60% of the multi-storey RC buildings in the Christchurch city centre were demolished following the 2010-2011 Canterbury earthquakes in New Zealand , despite many suffering what was considered to be onl y moderate structural damage [l]. These

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Wrecking Corporation of America Completes

2007-4-16  Wrecking Corp of America recently completed demolition and excavation work at the Tysons Corner site of Liberty Crossing, the former home of Nextel, a 256,000-square-foot, 10-story post-tensioned building in McLean, Virginia. The building owner was Peterson Companies, and the general contractor was Clark Construction Group of Bethesda, Maryland.

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Behaviour of Unbonded Post-Tensioned One-Way

2016-11-7  The results presented in this paper provide a valuable insight into the behaviour of unbonded post-tensioned concrete slabs during the construction phase and under ultimate load. Keywords experimental investigation, finite element modelling, post-tensioned concrete slabs, structural design, tendon, unbonded. Access Options.

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Experimental Investigation of Progressive Collapse of ...

2020-2-26  Qian et al. studied the collapse resistance of posttensioned concrete beam-column subassemblages with unbonded posttensioning strands and found that the effective prestress may significantly affect the ultimate deformability and load capacity of the PC frames. To date, limited research works have been done on progressive collapse of PC frame ...

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Demolition of Post-Tensioned Concrete Prestressed ...

2019-1-3  Demolition of. post-tensioned concrete Safe release of stored energy requires a reverse sequence of the original construction procedures. ittle has been published. L about the demolition of post-tensioned concrete but there is enough such concrete now in service to become a problem for demolition contractors. When a demolition sequence is being planned it is important to have a knowledge of ...

Get Price

364.8T-02(11) Use of Hydrodemolition for Concrete

2017-8-5  of the appropriate method of concrete removal is crucial. Hydrodemolition is not recommended for concrete removal if there is a possibility that unbonded post-tensioned systems are within the concrete removal zone. References 1. Sprinkel, M. M., “Preparing Bridge Decks for Overlays,” Concrete Repair Digest, V. 8, No. 5, 1997, pp. 242-247. 2.

Get Price

STRUCTURE magazine Post-Tensioned Concrete

Once the de-tensioning and demolition are complete, the profile of the tendons can also be adjusted within the work area to address the new structural spans and geometry. Once the tendon work is finished, including the addition of new end anchorages, the concrete floor slab is recast with rebar reinforcement (Figure 3). Bonding agents help ...

Get Price

Contemporary Post-tensioned Concrete Construction ...

Controlled demolition of an unbonded post-tensioned concrete slab (PTI special report). Post-Tensioning Institute, Pheonix AZ, 34 pp. Google Scholar Bletzacker, R. W. (1967).

Get Price

Post-Tensioned Bridge Assessment Assessment

2015-7-7  Parametric study of the residual strength of deteriorating simply-supported post-tensioned concrete bridges Authors: D. G. Cavell , P. Waldron Source: Proceedings of the Institution of Civil Engineers - Structures and Buildings, Volume 146, Issue 4 , 1 Nov 2001 (341–352)

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CONTRARY TO POPULAR OPINION, POST

2005-9-1  Another considerable cost advantage is the fact that concrete construction can provide more floors within a given height restriction, particularly through the use of posttensioned suspended concrete floors. These can be some 300mm thinner than alternative methods of construction.

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Computational Modelling of a Four Storey Post

2020-10-13  uneconomical, leading to their demolition. For example, 60% of the multi-storey RC buildings in the Christchurch city centre were demolished following the 2010-2011 Canterbury earthquakes in New Zealand , despite many suffering what was considered to be onl y moderate structural damage [l]. These

Get Price

Wrecking Corporation of America Completes

2007-4-16  Wrecking Corp of America recently completed demolition and excavation work at the Tysons Corner site of Liberty Crossing, the former home of Nextel, a 256,000-square-foot, 10-story post-tensioned building in McLean, Virginia. The building owner was Peterson Companies, and the general contractor was Clark Construction Group of Bethesda, Maryland.

Get Price

Behaviour of Unbonded Post-Tensioned One-Way

2016-11-7  The results presented in this paper provide a valuable insight into the behaviour of unbonded post-tensioned concrete slabs during the construction phase and under ultimate load. Keywords experimental investigation, finite element modelling, post-tensioned concrete slabs, structural design, tendon, unbonded. Access Options.

Get Price

Experimental Investigation of Progressive Collapse of ...

2020-2-26  Qian et al. studied the collapse resistance of posttensioned concrete beam-column subassemblages with unbonded posttensioning strands and found that the effective prestress may significantly affect the ultimate deformability and load capacity of the PC frames. To date, limited research works have been done on progressive collapse of PC frame ...

Get Price
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