Theoretical, experimental and numerical study on the influence of connectors on the thermal performance of precast concrete sandwich walls

Yu, Sisi; Liu, Yanfeng; Wang, Dengjia; Ma, Chao; Liu, Jiaping

doi:10.1016/j.jobe.2022.104886

Cited by 11 publications

(8 citation statements)

References 16 publications

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“…The PBCS wall studied in this paper also used the EPS board as the insulation material. Moreover, experimental data concluded that the thermal insulating performance [27] of sandwich wall panels increased along with the rise in thickness of the insulation wythe, while the axial bearing capacity [30] as well as lateral shear resistances [37][38][39][40] had an obvious decrease. Above all, the thickness of insulation would remarkably affect the structural weight, thermal insulating performance and hysteretic behavior of sandwich shear walls.…”

Section: Introductionmentioning

confidence: 99%

“…Previous research has revealed that the thermal insulation performance of sandwich wall panels with embedded polystyrene boards [27] outperforms that of sandwich wall panels with lightweight thermal insulation concrete as the aggregate [28]. Specifically, XPS boards and EPS boards are generally used as the thermal insulation layer in practical engineering [29,30].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Embedded Expanded Polystyrene Boards on the Hysteretic Behavior of Innovative Precast Braced Concrete Shear Walls

Tang,

2023

Buildings

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An innovative type of precast braced concrete shear (PBCS) wall has been tested and verified to have comparable shear resistances relative to conventional cast-in-place reinforced concrete (RC) shear walls. The triangular or rectangular embedded expanded polystyrene (EPS) boards in PBCS wall panels can not only considerably reduce concrete use but also reduce the structural weight. To understand the functions of EPS boards in more depth, this paper investigates the effects of the thickness ratio of different shapes of EPS on the hysteretic behaviors of PBCS walls with various shear span ratios (SSRs). The finite element (FE) models of PBCS walls based on the multi-layer shell element are developed and verified to be sufficiently accurate in comparison with the experimental results. The analysis results indicate that the bearing capacity, lateral stiffness and ductility of PBCS walls show a downward trend with the increase in the thickness ratio of EPS boards. The rectangular EPS board has a more pronounced effect on weight reduction as well as concrete use reduction compared to the triangular EPS board under the same thickness ratio. The formulations regarding the bearing capacity are developed and show good agreement with the numerical results. The thickness ratio limit for PBCS walls to satisfy the ductility requirement is addressed. This investigation not only provides insight into the cyclic behavior of PBCS walls with varied thickness ratios but also demonstrates the potential applicability of PBCS walls in precast concrete (PC) structures for both thermal insulation and earthquake resistance purposes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Embedded Expanded Polystyrene Boards on the Hysteretic Behavior of Innovative Precast Braced Concrete Shear Walls

Tang,

2023

Buildings

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“…Many scholars have carried out experimental and numerical programs in order to analyze the performance of concrete sandwich walls under various loading conditions [4][5][6][7][8][9][10][11][12][13][14]. Among them, Xu et al [5], Rao and Poluraju [8] and Xue et al [9] performed experimental investigations on concrete sandwich wall panels in order to analyze their seismic performance.…”

Section: Introductionmentioning

confidence: 99%

“…Among them, Xu et al [5], Rao and Poluraju [8] and Xue et al [9] performed experimental investigations on concrete sandwich wall panels in order to analyze their seismic performance. Lee and Pessiki [6] and Yu et al [11] analyzed the thermal behavior of the concrete sandwich walls based on experimental and numerical approaches. Kumar et al, [4] reported the test results of FRP-reinforced concrete sandwich walls under concentric axial loading.…”

Section: Introductionmentioning

confidence: 99%

Bending Performance of Concrete Sandwich Walls with Actual Boundary Conditions

et al. 2023

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Concrete sandwich walls are commonly used as the exterior wall panels of a structure, in which the wall suffers out-of-plane bending under strong wind conditions. This paper aims to investigate the bending performance of concrete sandwich walls under actual boundary conditions through experimental and analytical methods. In total, four concrete sandwich walls were tested to detect the influence of openings and loading direction. Typical failure patterns were characterized and discussed. The load-displacement curves of four test specimens were analyzed. It was indicated that the bearing capacity of the walls under negative bending conditions was higher than that under positive bending conditions, owing to the additional constraints provided by the steel beams. Strain distributions of wall specimens were also discussed in order to obtain the composite action of the sandwich walls between the upper and lower layers of concrete. In addition, the finite element model (FEM) was developed by ABAQUS to provide insights into the bending performance of the sandwich walls. Through comparison with the test results, the FEM was verified with a good level of accuracy. Subsequently, the degree of composite action of the sandwich walls was assessed in terms of both the moment of inertia and bearing capacity. From the experimental and numerical results, it demonstrated that the bearing capacity of concrete sandwiched wall under negative direction was higher than that under positive direction owing to the constraints of steel beam. The derived composite action degree could be employed to evaluate the out-plane bending stiffness and strength of sandwiched concrete wall. Both the experimental and analytical results in this paper are beneficial for the design of sandwich walls under bending conditions.

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“…Steel shear connectors have been widely employed to hold the wythes and foam core together. However, huge heat losses are noted in sandwich wall panels with steel connectors, due to the thermal bridging efect caused by the steel [5,6].…”

Section: Introductionmentioning

confidence: 99%

Flexural Behavior of Insulated Concrete Sandwich Panels using FRP-Jacketed Steel-Composite Connectors

Wang

Zhao³

et al. 2022

Advances in Materials Science and Engineering

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This study presented the experimental and theoretical results of insulated concrete Sandwich panels with innovative dumbbell-shaped steel fiber-reinforced polymer (FRP) composite bar (SFCB) connectors under flexural load. The influences of FRP thickness and raised thickness of dumbbell ends of connectors, axial compression ratio, the content of vitrified microspheres in the wythes, and loading direction were discussed. The increase in thickness of a glass FRP (GFRP) jacket on the hybrid bar from 2 to 3 mm led to increased initial cracking load, ultimate load, and flexural stiffness of the Sandwich panels by 75, 49, and 16%, respectively. The increase in the thickness of dumbbell ends from 4 to 6 mm led to increased initial cracking load, ultimate load, and flexural stiffness of the Sandwich panels of 18, 46, and 9%, respectively. The incorporation of vitrified microspheres in concrete wythes resulted in a significant increase in the load-carrying capacity of Sandwich panels but decreased ductility. Increased axial compression ratio from 0/1 to 0.2/1 contributed in improving the crack resistance and ultimate loads of Sandwich panels. Further increase of the axial compression ratio to 0.4/1 led to crushing failure of concrete wythe ends. Specimens under negative loads had higher ultimate loads than the counterparts under positive loads. Three-dimensional finite-element (FE) models were developed to simulate Sandwich panel flexural behavior and numerical results compared with the test data. Then, the verified FE model was used to analyze the influence of the arrangement of dumbbell-shaped SFCB connectors. Increased connector spacing from 550 to 650 mm was found to have an insignificant influence on load-deflection responses. Moreover, analytical solutions for deflection of Sandwich panels under combined axial-flexural load were obtained, in which the effect of slipping between the facade and structural wythes and shear deflection were considered. The predicted deflection at the ultimate load agreed well with the test results. This study provided a theoretical basis and design reference for FRP-jacketed steel-composite connectors in applications of Sandwich wall panels with large insulation layer thickness.

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Theoretical, experimental and numerical study on the influence of connectors on the thermal performance of precast concrete sandwich walls

Cited by 11 publications

References 16 publications

Effects of Embedded Expanded Polystyrene Boards on the Hysteretic Behavior of Innovative Precast Braced Concrete Shear Walls

Effects of Embedded Expanded Polystyrene Boards on the Hysteretic Behavior of Innovative Precast Braced Concrete Shear Walls

Bending Performance of Concrete Sandwich Walls with Actual Boundary Conditions

Flexural Behavior of Insulated Concrete Sandwich Panels using FRP-Jacketed Steel-Composite Connectors

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