Effect of cyclic loading on composite behavior of insulated concrete sandwich wall panels with GFRP shear connectors

Choi, Insub; Kim, Jun Hee; You, Young Chan

doi:10.1016/j.compositesb.2016.04.030

Cited by 53 publications

(21 citation statements)

References 17 publications

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“…It was noticed that the efficiency of precast sandwich panels depends also on its weight and the ability of heat isolation and overall strength [2,3]. Therefore, the main objectives of this study can be summarized as the following: obtaining a high (strength\weight) ratio by increasing strength of slabs with a lighter weight of slabs, approaching fully-composite action as possible by choosing the optimum type, the thickness of concrete, and core material.…”

Section: Objectives and Items Of Investigationmentioning

confidence: 99%

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Effect of Changing Properties of Wythes in Precast Structural Sandwich Panels

et al. 2020

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This study investigates the effects of changing in the properties of face and core wythes in structural sandwich panels (with dimensions of 500 500 mm and 120 mm total height). Concrete face wythes of three grades (80, 70, 37) MPa, thicknesses of (25, 35, and 45) mm, and three types of core materials (high density foam, polyethylene foam, and palm bark) were used in the production of panels. Steel shear connectors were installed in the panels with angle of 45º. Three-point bending load test was carried out on all panels and results were compared with both of the theoretical extremes capacities of non- composite and fully-composite states and ANSYS software results. The degree of composite action (%) and the (strength/weight) ratio were the main parameters that judged the specimens. It was found that upgrading concrete increased overall strength of slabs especially in high strength concrete (80 MPa), however the use of lightweight concrete (70 MPa) caused high (strength/weight) ratio due to very lightweight. Results revealed that decreasing thickness of concrete face wythes had a positive effect on strength/weight ratio (although the ultimate loads decreased) that enhanced the performance of panels as lightweight structural panels. The optimum face wythe thickness is that of 2.5 cm and has high (strength/weight) ratio. It was noticed that adding polyethylene foam as a core material results in positive effect and high (strength/weight) ratio. Results revealed that high strength concrete (80 MPa) and light-weight concrete (37 MPa) are very successful in the production face wythes of precast light-weight sandwich panels that can obtain high (strength/weight) ratio and high percent of composite action.

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Section: Objectives and Items Of Investigationmentioning

confidence: 99%

“…Many types of insulation materials were tested as core materials in SPSP. It was found that expanded polystyrene foam was very successful at service load level [3]. It also was found that high density foam is very practical, rigid, and light-weight when it was used as the core material in SPSP [14,16].…”

Section: Introductionmentioning

confidence: 99%

Effect of Changing Properties of Wythes in Precast Structural Sandwich Panels

et al. 2020

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“…In both monotonic loading and cyclic loading tests, the adhesive bonds based on the isolation absorption and the mechanical bonds base depend on the isolation surface roughness and groove treatment were effective in inducing the desired composite behavior of insulated concrete sandwich wall panels. To estimate the structural strength of insulated concrete sandwich, wall panels with glass fibers reinforced polymer shear sheets, the adhesive and mechanical bonds between the insulation and concrete wythes can be used [9,10]. In L-shaped angle connectors the maximum stress occurs in the weld attachment to the beam, whereas in the C-shaped angle connectors [11,12].…”

Section: Introductionmentioning

confidence: 99%

Effect of shear connectors on strength of structural sandwich panels

et al. 2020

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This study investigates the structural behavior of precast lightweight sandwich panels with dimensions of (500 × 500 mm) and 120 mm height. Specimens consists of three layers: concrete face wythes (with thicknesses of 45 mm and grades of (80, 70) MPa) and high-density foam (with thickness of 30 mm) as a core material. Steel and carbon fiber shear connectors (rods and strips) were used in panels with angles of (45°, 60° and 90°). Three-point flexure load test was carried out on all panels. Obtained results were studied with predicted ultimate loads from ANSYS software and the theoretical extremes capacities of 0% and full-composite cases to evaluate the effects of changing components. Strength/weight ratio and degree of composite action were obtained to can judge the panels with effective parameter. It was found that adding carbon fiber strips has a high positive effect in degree of composite action. Steel bars shear connectors were the optimum shear connectors' type with high strength concrete. Carbon fiber strips and rods shear connectors were the best shear connectors' type with light high strength concrete. All properties of specimens enhanced with the decrease of the angle of shear connectors with both of steel and carbon fiber shear connectors. Angle of 45° is the optimum angle that resists the flexure load, obtaining high degree of composite action and high strength/weight ratio. It also obtained the highest percent of predicted ultimate loads from ANSYS software. Keywords Precast concrete sandwich panel • Lightweight units • Shear connector • Carbon fiber • Lightweight concrete • Strength/weight • Composite • Shear flow Abbreviations FCR Carbon fiber rods with diameter of 12 mm FCS Carbon fiber strips with cross section of (50 mm) × (1.2 mm) HD foam High density foam HSC High strength concrete LHSC Light high strength concrete

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“…The glass fiber-reinforced polymer (GFRP) connector is a new option in the recent decades, with the advantages including high tensile strength, less heat conduction and easy application. Studies had been conducted to evaluate the structural performance of GFRP connectors, including tensile, shear and flexural behavior of concrete sandwich panels with GFRP connectors [5][6][7][8][9]. Previous research indicated that concrete sandwich wall panels with GFRP connectors had satisfactory composite behavior.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Structural Performance of Precast Concrete Insulated Sandwich Panels with Cruciform Cross Section GFRP Connectors

et al. 2019

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This study investigated the structural performance of precast concrete insulated sandwich panels with cruciform cross section glass fiber-reinforced polymer (GFRP) connectors, based on tensile and shear tests. 5 tensile specimens and 4 shear specimens were fabricated and tested. The load-displacement relation and failure mode of the specimens were analyzed. The results revealed that the average ultimate tension load of the tested specimens with single GFRP connector was 13.14kN with concrete splitting or concrete partial cone failure. For the shear specimens, the average ultimate shear load was 14.83kN with rupture failure of GFRP connector. Furthermore, durability of sandwich panels was investigated, by fabricating and testing 48 tensile specimens with GFRP connectors immersed in 30°C and 60°C alkaline solution for 30d, 60d, 90d, 120d, 150d and 180d. The results indicated that aging of GFRP connectors in alkaline environment would not reduce, but slightly increase the load capacity of the tensile specimens. In addition, safety evaluation of precast concrete sandwich panels was conducted based on the data of structural performance tests. The result showed that the sandwich panels with GFRP connector subjected to combined shear and tension load had sufficient safety in different design situations.

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Effect of cyclic loading on composite behavior of insulated concrete sandwich wall panels with GFRP shear connectors

Cited by 53 publications

References 17 publications

Effect of Changing Properties of Wythes in Precast Structural Sandwich Panels

Effect of Changing Properties of Wythes in Precast Structural Sandwich Panels

Effect of shear connectors on strength of structural sandwich panels

Experimental Study of Structural Performance of Precast Concrete Insulated Sandwich Panels with Cruciform Cross Section GFRP Connectors

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