Bending and Shear Strength of I-Slab with Polystyrene Forms

2008 ◽  
Vol 385-387 ◽  
pp. 353-356 ◽  
Author(s):  
Seung Hun Kim ◽  
K.K. Lee ◽  
Han Seung Lee ◽  
K.J. Lee ◽  
In Seok Kang
Keyword(s):  
Precast Concrete ◽  
The Self ◽  
Punching Shear ◽  
Structural Performance ◽  
Displacement Curve ◽  
Test Results ◽  
Construction Period ◽  
Experimental Works ◽  
Concrete Deck

Where the self weight of the overall slab needs to be considered, the quantity of in-situ concrete required can be reduced by the introduction of polystyrene void forms supplied and fixed to the precast panel during manufacture. In this study, new I-slab system with polystyrene form and precast concrete deck is proposed to reduce the construction period and the self weight of the slab. This paper presents experimental works on the bending and shear of the I-slabs. Five specimens were tested. The main parameters of experiments were the hole diameter of polystyrene form and the thickness of slab. Structural performance of I-slab was evaluated on the basis of failure mode, load-displacement curve, and ultimate strengths. Based on the test results, the critical punching shear sections were changed as test variables, so the punching shear strengths were very different. Test results indicated that the developed I-slab were very effective to increase the strength because of self weight reduction.

Shear Strength of Void Slab with Polystyrene Forms

2012 ◽  
Vol 217-219 ◽  
pp. 626-629
Author(s):  
Seung Hun Kim
Keyword(s):  
Shear Strength ◽  
Precast Concrete ◽  
Test Results ◽  
Ultimate Shear Strength ◽  
Construction Period ◽  
Failure Patterns ◽  
Shear Performance ◽  
Experimental Works ◽  
Resistance Performance ◽  
Concrete Deck

Void slab systems with polystyrene form and precast concrete deck have been used to reduce the construction period and the self-weight of the slab. This paper presents experimental works on the shear of the void slabs. Four specimens were tested. The main parameters of experiments were the type of polystyrene forms and the thickness of slab. Shear performances of void slabs were evaluated on the basis of failure patterns, load-displacement curves, and ultimate shear strengths. Based on the test results, the unidirectional void slabs had the best shear resistance performance when they used PF2 type of polystyrene forms. For all specimens that failed due to shear, ultimate shear strength was 52% or higher than nominal shear strength by ACI318-08. This indicates that void slabs have a sufficient shear performance in the truss bar arrangement direction

Flexural Behavior of Void RC and PC Slab with Polystyrene Forms

2010 ◽  
Vol 452-453 ◽  
pp. 61-64 ◽  
Author(s):  
Seung Hun Kim
Keyword(s):  
Precast Concrete ◽  
The Self ◽  
Flexural Behavior ◽  
Displacement Curve ◽  
Test Results ◽  
Analysis Model ◽  
Element Analysis ◽  
Floor System ◽  
Structural Behaviors

Where the self weight of the overall RC(Reinforced Concrete) or PC(Precast Concrete) floor system needs to be considered, the quantity of in-situ concrete required can be reduced by the application of polystyrene void forms to slab. In this study, flexural behaviors of void RC and PC slab with polystyrene form were evaluated to understand the effect on the self weight reduction of the slab. This paper presents experimental works and finite element analysis on the bending of the void slabs. Six specimens were tested. The main parameters of experiments were the slab types (RC and PC), the types and arrangement details of polystyrene form, and the thickness of slab. Structural behaviors of void slabs were evaluated on the basis of failure mode, load-displacement curve, and ultimate strengths. Test results indicated that nominal strengths by ACI code agreed well with experimental results. The results of analysis were compared with the results of test for estimating the validity of analysis model.

scholarly journals Structural Performance of PC Double Beam–Column Connection Under Gravity and Seismic Loading

2020 ◽  
Vol 14 (1) ◽  
Author(s):  
Jang-Woon Baek ◽  
Su-Min Kang ◽  
Tae-Ho Kim ◽  
Jin-Yong Kim
Keyword(s):  
Precast Concrete ◽  
Lateral Loading ◽  
Flexural Behavior ◽  
Structural Performance ◽  
Test Results ◽  
Moment Frame ◽  
Loading Test ◽  
Beam System ◽  
Double Beam ◽  
Secant Stiffness

AbstractRecently, as a new precast concrete (PC) construction method for increasing economy and constructability, the PC double-beam system has been developed for factories or logistic centers, where construction duration is particularly important. In this study, half-scaled PC double beam–column connection was tested under gravity loading and cyclic lateral loading. The major test parameters included the use of the spliced PC column and the addition of reinforcement at the beam–column joint. In the gravity loading test, the flexural behavior of the PC double beam was investigated. The test results showed satisfactory flexural capacity at the PC double-beam section, validating the composite action between the PC and RC members. In the cyclic lateral loading test, the seismic performance of the PC double beam–column connection was investigated. Based on the test results, the failure mode, load-carrying capacity, deformation capacity, energy dissipation capacity, secant stiffness, and shear strength of the PC double-beam system were evaluated and compared with those of a conventional RC double beam–column connection. According to the test results, the structural performance of the PC double beam–column connection was comparable to that of the RC double beam–column connection and satisfied the acceptance criteria of moment frame in the ACI 374.1-05 provision.

scholarly journals Experimental Study on Self Compacted Concrete Mix Using Admixtures and Accessing its Performance By Comparing with Conventional Concrete (M25)

2018 ◽  
Vol 7 (1) ◽  
pp. 78-83
Author(s):  
S .Vivek . ◽  
G. Sri Harin .
Keyword(s):  
Industrial Waste ◽  
Precast Concrete ◽  
The Self ◽  
Hardened Concrete ◽  
Innovative Product ◽  
Cement Concrete ◽  
Conventional Concrete ◽  
Plastic Properties ◽  
Concrete Mix

The self compacted concrete is an innovative product in civil engineering field of India. The necessity of this product was felt by civil engineers to overcome in the issue of workmanship, in structural concreting of heavily reinforced sections in execution of concrete. The introduction of SCC in the precast concrete industry was successful, with regard to application in situ; the development is slower because of the sensitivity of the product.The development of concrete that can be compacted in to every corner of a formwork by means of its own weight and without vibration is reviewed.SSC was developed to achieve durable concrete structures.This type of concrete has used by large construction companies.In recent years SSC has gained wide use for placement In reinforced concrete structures with difficult casting conditions. Sludge is a major issue since the they are the obtained from sewage and industrial waste where it causes many problems, so it can be used as admixture to the concrete because it attains more strength. In this paper, the mechanical properties of SCC in comparison to conventional concrete and concrete using sludge were discussed. The compressive strength results of hardened concrete showed that SCC gained strength slowly compared to theconventional cement concrete due to the presence of admixture and it’s 28 days strength was lower than conventional cement concrete ,but SCC eventually had potentials of higher strength beyond 90 days. Finally the effect of water cement ratio on the plastic properties of SCC was quite negligible compared to conventional method.

scholarly journals Structural Performance of a Precast Concrete Modular Beam Using Bolted Connecting Plates

2021 ◽  
Vol 11 (24) ◽  
pp. 12110
Author(s):  
Kyong Min Ro ◽  
Min Sook Kim ◽  
Chang Geun Cho ◽  
Young Hak Lee
Keyword(s):  
Precast Concrete ◽  
Steel Plates ◽  
Structural Performance ◽  
Modular System ◽  
Beam Specimen ◽  
Test Results ◽  
Reinforcing Bars ◽  
Bolted Connection ◽  
Modular Units ◽  
Modular Structures

In modular structures, prefabricated modular units are joined at the construction site. Modular structures must ensure splicing performance by connecting modular units sufficiently. The bolted connection using steel plates may suffer from alignment issues and corrosion problems. In a precast concrete (PC) modular system, there is difficulty grouting the sleeves when splicing reinforcing bars. This study proposed a PC modular beam using a bolted connecting plate to deal with issues in typical steel modules and PC modules. The structural performance was evaluated by flexural and shear tests on two monolithic beams and two proposed PC specimens. The test results showed that the structural performance of the PC modular specimen was 88% of that of the monolithic reinforced concrete (RC) beam specimen and 102% of the strength calculated by ACI 318-19. Therefore, the proposed PC modular system using bolted connecting plates can solve the problems observed in typical steel and PC modules and improve the structural performance.

scholarly journals Experimental Research on Interfacial Bonding Strength between Vertical Cast-In-Situ Joint and Precast Concrete Walls

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 494
Author(s):  
Changyong Li ◽  
Yabin Yang ◽  
Jiuzhou Su ◽  
Huidi Meng ◽  
Liyun Pan ◽  
...  
Keyword(s):  
Rough Surface ◽  
Bonding Strength ◽  
Precast Concrete ◽  
Good Choice ◽  
Interfacial Bonding ◽  
Wall Structure ◽  
Test Results ◽  
Concrete Walls ◽  
Interfacial Bonding Strength

In the monolithic precast concrete shear-wall structure, the bonding property of cast-in-situ joints to precast concrete walls is important to ensure the entire structural performance. Aiming to the vertical joint of precast concrete walls, an experimental study was carried out considering the factors including the strength of precast and joint concretes, as well as the interface processing and casting age of precast concrete. The micro-expansion self-compacting concrete was used for the cast-in-situ joints. The interfacial bonding strength between joint and precast concrete was measured by splitting tensile test. Results show that the interfacial bonding strength was benefited from the increasing strength of joint concrete and the spraying binder paste on the interface of precast concrete, and unbenefited from the overtime storage of precast concrete. The washed rough surface with exposed aggregates improved the interfacial bonding strength, which increased with the increasing roughness. Based on the test results, the limits of the strength grade of joint concrete and the roughness of washed rough surface are proposed to get the interfacial bonding strength equivalent to the tensile strength of precast concrete. Meanwhile, the spraying of binder paste on precast concrete is a good choice, the storage time of precast components is a better limit within 28 days.

Performance of Skew Reinforcing in Inverted-T Bridge Caps

2018 ◽  
Vol 2672 (41) ◽  
pp. 65-74 ◽  
Author(s):  
Satya Sapath Roy ◽  
Jamshaid Sawab ◽  
Tianmin Zhou ◽  
Y. L. Mo ◽  
Thomas T. C. Hsu
Keyword(s):  
Traditional Method ◽  
Structural Performance ◽  
Transverse Reinforcement ◽  
Test Results ◽  
Physical Test ◽  
Construction Period ◽  
Traditional Arrangement

Inverted-T bridge caps (ITBCs) have been widely used in most bridges in Texas in recent years. In some typical cases, the bridge caps are skew when two roads are not aligned in a perpendicular manner. The traditional method of flaring the transverse reinforcement out in skew ITBCs introduces significant complexity in design and during construction. An alternative is to provide skew reinforcing which will substantially reduce the design complexities and construction period. In this paper, three ITBC specimens were subjected to shear action to evaluate and compare the performance of ITBCs with traditional reinforcing with those with skew reinforcing. The three specimens include 0-degree skew, 30-degree skew with traditional reinforcing, and 30-degree skew with skew reinforcing, worthy of verification and quantification as demonstrated in this paper. The physical test results show that the skew reinforcement arrangement does not weaken the bridge cap’s capacity, and the structural performance remains almost the same as that of the traditional arrangement. In addition, the serviceability performance of skew reinforcements is better as compared with traditional reinforcements.

Wisconsin’s Use of Full-Depth Precast Concrete Deck Panels Keeps Interstate 90 Open to Traffic

PCI Journal ◽  
2007 ◽  
Vol 52 (1) ◽  
pp. 16-30
Author(s):  
James W. Carter ◽  
Tom Pilgrim ◽  
Finn K. Hubbard ◽  
Tim Poehnelt ◽  
Michael Oliva
Keyword(s):  
Precast Concrete ◽  
Deck Panels ◽  
Concrete Deck

scholarly journals Direct Characterization of the Relation between the Mechanical Response and Microstructure Evolution in Aluminum by Transmission Electron Microscopy In Situ Straining

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1431
Author(s):  
Seiichiro Ii ◽  
Takero Enami ◽  
Takahito Ohmura ◽  
Sadahiro Tsurekawa
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Ion Beam ◽  
Elastic Behavior ◽  
Annealed Specimen ◽  
Displacement Curve ◽  
Dislocation Loops ◽  
Transmission Electron ◽  
Stress Drops

Transmission electron microscopy in situ straining experiments of Al single crystals with different initial lattice defect densities have been performed. The as-focused ion beam (FIB)-processed pillar sample contained a high density of prismatic dislocation loops with the <111> Burgers vector, while the post-annealed specimen had an almost defect-free microstructure. In both specimens, plastic deformation occurred with repetitive stress drops (∆σ). The stress drops were accompanied by certain dislocation motions, suggesting the dislocation avalanche phenomenon. ∆σ for the as-FIB Al pillar sample was smaller than that for the post-annealed Al sample. This can be considered to be because of the interaction of gliding dislocations with immobile prismatic dislocation loops introduced by the FIB. The reloading process after stress reduction was dominated by elastic behavior because the slope of the load–displacement curve for reloading was close to the Young’s modulus of Al. Microplasticity was observed during the load-recovery process, suggesting that microyielding and a dislocation avalanche repeatedly occurred, leading to intermittent plasticity as an elementary step of macroplastic deformation.

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