Crack and deformation behavior of composite beams using partial‐depth precast concrete units

2020 ◽  
Vol 2 (1-2) ◽  
pp. 29-44
Author(s):  
Matthias Mager ◽  
Karsten Geißler
Keyword(s):  
Deformation Behavior ◽  
Precast Concrete ◽  
Composite Beams

Shear Strength of Fixed Composite Beams Combining Precast Concrete and Cast-In-Place Concrete

2021 ◽  
Vol 33 (6) ◽  
pp. 609-618
Author(s):  
Joo-Hyun Jin ◽  
Hong-Gun Park ◽  
Chul-Goo Kim
Keyword(s):  
Shear Strength ◽  
Precast Concrete ◽  
Composite Beams

scholarly journals Structural Behavior of Steel-Concrete Composite Beam using Bolted Shear Connectors: A Review

2018 ◽  
Vol 203 ◽  
pp. 06010
Author(s):  
Nadiah Loqman ◽  
Nor Azizi Safiee ◽  
Nabilah Abu Bakar ◽  
Noor Azline Mohd Nasir
Keyword(s):  
Composite Beam ◽  
Concrete Slab ◽  
Precast Concrete ◽  
Composite Beams ◽  
Reinforced Concrete Beams ◽  
Structural Behavior ◽  
Concrete Slabs ◽  
Steel Beam ◽  
Shear Connectors ◽  
Beam System

Conventional steel-concrete composite beams have been recognized to exhibit stronger structural characteristics, in terms of strength and stiffness, when compared to pure steel or reinforced concrete beams. However, currently most steel beam is fully attached to the concrete slab; this means that the shear connectors are welded through the steel decking on to the steel beam and cast into concrete slab to fulfill the necessary shear connection. Recently, the deconstruction and reuse of the components almost impossible. In order to achieve a sustainable structural system, precast concrete slabs are attached to a steel beam using bolted shear connectors in prefabricated holes have been introduced as an alternative to the conventional connectors in steel – concrete composite beam system. This paper reviews the structural behavior of composite beam system such as the strength, stiffness, slip behavior, failure mode and sustainability obtained by experiment and numerical studies in order to address the applicability and efficiency of the composite beams having precast concrete slabs and bolted shear connectors.

scholarly journals Design for Deconstruction for Sustainable Composite Steel-Concrete Floor Systems

2018 ◽  
Author(s):  
Jerome F. Hajjar ◽  
Lizhong Wang ◽  
Mark D. Webster
Keyword(s):  
Raw Materials ◽  
Precast Concrete ◽  
Composite Beams ◽  
Flexural Behavior ◽  
Concrete Slabs ◽  
Steel Beams ◽  
Design Strategies ◽  
Composite Action ◽  
Floor Systems ◽  
Headed Stud

Conventional steel-concrete composite floor systems utilizing steel headed stud anchors and metal decks are cost-effective and widely used solutions for non-residential multi-story buildings, due in part to their enhanced strength and stiffness relative to non-composite systems. Because these systems use steel headed stud anchors welded onto steel flanges and encased in cast-in-place concrete slabs to achieve composite action, it is not possible to readily deconstruct and reuse the steel beams and concrete slabs. As the building industry is moving towards sustainability, there are clear needs for developing sustainable steel-concrete composite floor systems to facilitate material reuse, minimize consumption of raw materials, and reduce end-of-life building waste. This paper presents the behavior and design strategies for a sustainable steel-concrete composite floor system. In this system, deconstructable clamping connectors are utilized to attach precast concrete planks to steel beams to achieve composite action. The load-slip behavior of the clamping connectors was studied in pushout tests, and the test results showed that the clamping connectors possess similar shear strength to 19 mm diameter shear studs and much greater slip capacity. Four full-scale beam tests were performed to investigate the flexural behavior of the deconstructable composite beams under gravity loading and validate the connector behavior attained from the pushout tests. All the beams behaved in a ductile manner. The flexural strengths of the composite beam specimens closely match the strengths predicted for composite beams by the design provisions of the American Institute of Steel Construction (AISC).

Design for Deconstruction Using Sustainable Composite Beams with Precast Concrete Planks and Clamping Connectors

2020 ◽  
Vol 146 (8) ◽  
pp. 04020158
Author(s):  
Lizhong Wang ◽  
Mark D. Webster ◽  
Jerome F. Hajjar
Keyword(s):  
Precast Concrete ◽  
Composite Beams

Research Progress on Reinforced Concrete Composite Beam in China

2014 ◽  
Vol 584-586 ◽  
pp. 939-943
Author(s):  
Wei Jian Zhao ◽  
Jia Xin Tong ◽  
Shen Ming Yuan ◽  
Ye Nan Guo
Keyword(s):  
Reinforced Concrete ◽  
Composite Beam ◽  
Building Materials ◽  
Precast Concrete ◽  
Crumb Rubber ◽  
Composite Beams ◽  
Fiber Reinforced Concrete ◽  
Research Progress ◽  
Fiber Reinforced ◽  
Reactive Powder

Reinforced concrete composite beam plays a very important role in the precast concrete structure, composite beam research is critical. Based on the research results about it in China, on the one hand, from the traditional composite beams to the improved ones, the various kinds of composite beams were concluded; on the other hand, the applications of new building materials in the composite beams had been included, which included fiber reinforced cement-based composites, steel fiber reinforced concrete, reactive powder concrete and crumb rubber concrete. Through to the both related tests and theoretical studies, the progress of the composite beams was summarized. Finally, the further research was prospected.

Plastic deformation of θ ' in Al-4%Cu alloy

1978 ◽  
Vol 36 (1) ◽  
pp. 576-577
Author(s):  
Shrikant P. Bhat
Keyword(s):  
Deformation Behavior ◽  
Room Temperature ◽  
Electron Microscopic Observation ◽  
Bulk Alloy ◽  
Electron Microscopic ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Orowan Mechanism ◽  
The Subject ◽  
Cyclic Straining

deformation behavior of Al-Cu alloys aged to contain θ ' has been the subject of many investigations (e.g., Ref. 1-5). Since θ ' is strong and hard, dislocations bypass θ ' plates (Orowan mechanism) at low strains. However, at high strains the partially coherent θ ' plates are probably sheared, although the mechanism is complex, depending on the form of deformation. Particularly, the cyclic straining of the bulk alloy is known to produce gross bends and twists of θ '. However, no detailed investigation of the deformation of θ ' has yet been reported; moreover, Calabrese and Laird interpreted the deformation of θ ' as largely being elastic.During an investigation of high temperature cyclic deformation, the detailed electron-microscopic observation revealed that, under reversed straining conditions, θ ' particles are severely distorted--bent and twisted depending on the local matrix constraint. A typical electronmicrograph, showing the twist is shown in Fig. 1. In order to establish whether the deformation is elastic or plastic, a sample from a specimen cycled at room temperature was heated inside the microscope and the results are presented in a series of micrographs (Fig. 2a-e).

Observation of secondary slip systems in tungsten bicrystals

1984 ◽  
Vol 42 ◽  
pp. 478-479
Author(s):  
J. R. Fekete ◽  
R. Gibala
Keyword(s):  
Stress Field ◽  
Grain Boundaries ◽  
Deformation Behavior ◽  
Stress Axis ◽  
Polycrystalline Materials ◽  
Slip Systems ◽  
Metallic Materials ◽  
Twist Boundary ◽  
Secondary Slip ◽  
Plane Normal

The deformation behavior of metallic materials is modified by the presence of grain boundaries. When polycrystalline materials are deformed, additional stresses over and above those externally imposed on the material are induced. These stresses result from the constraint of the grain boundaries on the deformation of incompatible grains. This incompatibility can be elastic or plastic in nature. One of the mechanisms by which these stresses can be relieved is the activation of secondary slip systems. Secondary slip systems have been shown to relieve elastic and plastic compatibility stresses. The deformation of tungsten bicrystals is interesting, due to the elastic isotropy of the material, which implies that the entire compatibility stress field will exist due to plastic incompatibility. The work described here shows TEM observations of the activation of secondary slip in tungsten bicrystals with a [110] twist boundary oriented with the plane normal parallel to the stress axis.

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