Investigation into Resilience of Precast Concrete Floors

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Investigation into resilience of precast concrete floors ...

Investigation into resilience of precast concrete floors against progressive collapse. ACI Structural Journal, 116(2), 171‑182. doi:10.14359/51710878

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Investigation into Resilience of Precast Concrete Floors ...

Mar 01, 2019  Title: Investigation into Resilience of Precast Concrete Floors against Progressive Collapse Author(s): Kai Qian and Bing Li Publication: Structural Journal Volume: 116 Issue: 2 Appears on pages(s): 171-182 Keywords: load-resisting mechanism; monolithic connection; precast concrete; progressive collapse; resilience Date: 3/1/2019 Abstract: The casualties and economic loss in historic

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Investigation into Resilience of Precast Concrete Floors ...

Investigation into Resilience of Precast Concrete Floors against Progressive Collapse ... resistance, there is less research on precast concrete (PC) buildings to mitigate progressive collapse ...

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Investigation into resilience of precast concrete floors ...

Investigation into resilience of precast concrete floors against progressive collapse. ACI Structural Journal, 116(2), 171-182. doi:10.14359/51710878 Series/Report no.:

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PERFORMANCE OF PRECAST CONCRETE FLOOR SYSTEMS

investigation into the performance of precast concrete floor systems in Christchurch, and it is anticipated that a detailed database and associated damage statistics will be published following the completion of the data collation process. BACKGROUND Precast concrete is commonly used in New Zealand for a range of different structural and

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(PDF) Progressive Collapse Resistance of Precast Concrete ...

509 [2 7] Qian K, Li B. Investigation into resilience of precast concrete floors against progressive collapse. 510 ACI Structural Journal 2019; 116(2): 171-182. 511 [ 2 8 ] Al-Salloum YA ...

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Building Resilience A - ARCIS

even transform concrete into a carbon sink.” By way of an example, Don Zakariasen, director of marketing, concrete products, Lafarge North America, says that Lafarge is continuing to make progress regarding the Solidia system that uses CO2 in the cur-ing process in an effort to reduce the carbon footprint of precast concrete.

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Investigation of Thermal Behaviour of a Hybrid Precasted ...

A comprehensive material testing programme was undertaken to measure the properties of the concrete (precast and in situ) in the floor over time. Concrete specimens (cubes, cylinders and prisms) were made and cured in water (in accordance with EN 12390-2 (BSI 2009)) and in air (to replicate environmental conditions on site). The properties of ...

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Experimental investigation of a precast concrete ...

Jan 01, 2019  The newly developed SBED was employed in a precast post-tensioned concrete connection in this study, as shown in Fig. 1(a). A precast concrete frame with the proposed Precast Post-tensioned concrete connection with all-steel bamboo-shaped Energy Dissipaters, abbreviated as PPED, has the advantages of a high-speed assembly, enough construction tolerance and resilience.

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(PDF) Progressive Collapse Resistance of Emulative Precast ...

Investigation into Resilience of Precast Concrete Floors against Progressive Collapse. ... structure has shown its excellent aseismic performance in laboratory tests and earthquake investigation ...

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ADDENDUM: Investigation into the performance of Statistics ...

for precast concrete floor units was less than the 50mm minimum specified on the design documentation. The presence of the short seatings of the precast concrete floor units does not change the ... This document is an addendum to the Investigation into the Performance of Statistics House in

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Precast concrete floors project BRANZ Build

Aug 01, 2019  THE PARTIAL COLLAPSE of precast concrete floors in Statistics House in Wellington during the 2016 Kaikōura earthquake sparked serious concerns about the seismic performance of precast floors.. Investigation into performance of building. In response, the Ministry of Business, Innovation and Employment (MBIE) commissioned an investigation into the performance of the

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Numerical investigation into the effect of stepping on the ...

Aug 02, 2020  The mechanized tunnelling process is mainly coupled with precast concrete segments, which include segmental rings that they are placed in their place simultaneously with the boring operation. Segments are mainly loaded by thrust jacks during the installation stage. It is essential to limit the cracks and damages of the segments during this stage to be sure of their structural integrity and ...

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CONCRETE: CAST-IN PLACE AND PRE-CAST, SLAB TYPES AND FLOOR

B. Pre-cast Precast concrete is a construction product produced by casting concrete in a reusable mold or "form" which is then cured in a controlled environment, transported to the construction site and lifted into place. In contrast, standard concrete is poured into site-specific forms and cured on site. Precast stone is distinguished from ...

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Investigation into the Causes of the Deflexion of Heated ...

Dr. F. G. Thomas (Hon. Treasurer; Building Research Station) made the following points:- (1) The Building Research Station was extremely interested and was actively studying the problems discussed by the authors. For over ten years the Scottish Laboratory of the BRS had conducted an investigation into the moisture movement of natural rock aggregates and its effect on the properties of concrete ...

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The Worldwide Precast Concrete Industry is Expected to ...

Mar 18, 2021  Dublin, March 18, 2021 (GLOBE NEWSWIRE) -- The "Precast Concrete Market by Element (Columns Beams, Floors Roofs, Girders, Walls Barriers, Utility Vaults, Pipes, Paving Slabs), Construction ...

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Progressive collapse test of assembled monolithic concrete ...

Jan 22, 2020  Qian, K, Li, B (2019 a) Investigation into the resilience of precast concrete floors against progressive collapse. ACI Structural Journal 116(2): 171 – 182 . Google Scholar Crossref

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The Concrete Conference 2021

Oct 12, 2019  Session 5A Paper 4 ‘Hollowcore Floors: Challenging Industry Perceptions’ Daniel Kennett / Nicholas Brazzale. Observed damage to precast concrete floors in Christchurch and Wellington following recent earthquakes has focused the attention of structural engineers (and the public) on the seismic performance of precast concrete floors, and in particular on the performance of hollowcore floors.

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Condo residents saw pool deck and garage collapse before ...

Jun 30, 2021  The building’s floor system was made of 8-inch-thick concrete plates atop columns, he said. 04:45 - Source: CNN Letter sent months before deadly

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Wgtn's Statistics House floors not built as planned RNZ News

Jul 04, 2018  A renewed investigation into why Statistics House on the Wellington waterfront was badly damaged in the 2016 Kaikōura earthquake has found the floors were not built as planned. Photo: RNZ. Some of the overlap where the precast concrete floor units sat on ledges around the perimeter, was not as wide as it should have been.

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NHERI @ UC San Diego - Completed Projects

A one-half scale three story precast concrete diaphragm will be tested on the shake table at UCSD to investigate the behavior of long-span precast concrete diaphragms under seismic excitation. The project is funded by NSF GOALI and is being conducted by a multi-university and industry consortium.

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Investigation into the performance of Statistics House in ...

the loss of support to three precast concrete floor units on the first and second floors. The moment resisting frames performed as expected, and were not in danger of collapse. 3 ... investigation into the performance of Statistics House in this earthquake, in order to understand the

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Investigation into the collapse of the Forsyth Barr ...

resilience is provided by the frame action of the reinforced concrete beams and columns. For three levels above the ground level, the floors extend beyond the footprint of the tower to form a podium on the south and east sides. The “scissor” stairs are orientated diagonally within the tower in a

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Commission launches in-depth investigation into ...

Feb 19, 2018  The review further suggested that floors and other elements cast in situ (that is, cast on the building site itself using ready-mixed concrete) are not a substitute for precast concrete elements. In this respect, the investigation shows that precast concrete elements have specific advantages in terms of building site logistics, as they allow ...

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AN INVESTIGATION INTO THE RESILIENCE OF GLULAM

AN INVESTIGATION INTO THE RESILIENCE OF GLULAM TIMBER BEAMS AFTER FIRE EXPOSURE Chorlton, Bronwyn1, Harun, Georgette1, Gales, John2,5, Weckman ... framing, as well as CLT for the floors. The CLT floors are topped with concrete, and each CLT plank will be notched in the manufacturing process in order to connect with the steel beams and columns. ...

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Precast/Prestressed Concrete Structures under Natural and ...

Nov 11, 2007  The last paper on precast concrete floor diaphragms investigates the “Design of Precast Diaphragm Chord Connections for In-Plane Tension Demands.” In this paper, Cao and Naito discuss the design and modeling of a welded chord connection commonly used in pre-topped precast double tee floor members.

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Investigation into the Causes of the Deflexion of Heated ...

Dr. F. G. Thomas (Hon. Treasurer; Building Research Station) made the following points:- (1) The Building Research Station was extremely interested and was actively studying the problems discussed by the authors. For over ten years the Scottish Laboratory of the BRS had conducted an investigation into the moisture movement of natural rock aggregates and its effect on the properties of concrete ...

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An investigation into crowd-induced vertical dynamic loads ...

Fourteen simply supported precast reinforced concrete floor slabs of 4.5m span and 900mm width were exposed to two standardised heating regimes used in fire resistance furnace tests. The tests were designed to show the effect of varying the slab thickness, type of concrete, imposed load, nature of fire exposure and soffit protection on the mid ...

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Wgtn's Statistics House floors not built as planned RNZ News

Jul 04, 2018  A renewed investigation into why Statistics House on the Wellington waterfront was badly damaged in the 2016 Kaikōura earthquake has found the floors were not built as planned. Photo: RNZ. Some of the overlap where the precast concrete floor units sat on ledges around the perimeter, was not as wide as it should have been.

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Three Key Lessons about Moisture in Concrete Concrete ...

Jun 14, 2019  Second, older floors require investigation and a little patience to verify their moisture condition. Ambient Conditions Invariably Mess with Surface Testing. Surface-based tests, by definition, only take moisture vapor readings at the surface of the concrete. This makes them highly sensitive to the ambient conditions around the slab.

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Connections in Precast Concrete Construction Topic

Nov 01, 2020  STANDARDS, PRACTICES and MANUALS ON CONNECTIONS IN PRECAST CONCRETE CONSTRUCTION. ACI PRC-550.2-13 Design Guide for Connections in Precast Jointed Systems. SP-004: (8TH) Formwork for Concrete. ACI CODE-318M-14: Student Price-318-14 Building Code Requirements for Structural Concrete and Commentary.

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Inspection of the Precast Concrete Surface Preparation and ...

Mar 19, 2021  Precast concrete is cleaned and painted for both beautification and protection. Painting may involve the use of protective coatings, stains, or water repellents. For the materials to adhere and provide the desired service life, the quality of surface preparation and application must be assured. This can be accomplished by thoroughly inspecting each phase of the work.

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The Concrete Conference 2021

Oct 12, 2019  Session 5A Paper 4 ‘Hollowcore Floors: Challenging Industry Perceptions’ Daniel Kennett / Nicholas Brazzale. Observed damage to precast concrete floors in Christchurch and Wellington following recent earthquakes has focused the attention of structural engineers (and the public) on the seismic performance of precast concrete floors, and in particular on the performance of hollowcore floors.

Get price

Glossary » Seismic Resilience

A precast/prestressed concrete unit commonly used in floors or roofs. driven pile . A pile made of timber, steel or precast concrete that is typically hammered into the ground to form foundations. ductility. A measure of how easily a solid material (such as a metal) deforms under stress without breaking. ... tensioned cables or bars are ...

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Experimental and numerical investigation of jointed self ...

Apr 15, 2018  A jointed self-centering (SC) concrete wall system with friction connectors is proposed, in which the precast concrete wall panels are assembled through unbonded posttensioning (PT) tendons to provide self-centering capacity, and friction connectors at the vertical joint provide supplementary energy dissipation as the walls move relatively to each other during a major earthquake.

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