Hysteretic Response of Tilt-Up Concrete Precast Walls with Embedded Steel Plate Connections

Sun-Woo Kim ,Hye‐Ran Kim ,Wonchang Choi

doi:10.3390/su12197907

Sun-Woo Kim , Hye‐Ran Kim + Show 1 more

Open Access

https://doi.org/10.3390/su12197907

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Abstract

Many connection systems are available that can transfer tension and shear loads from a precast concrete wall panel to a floor slab. However, due to the insufficient anchor depth in relatively thin precast concrete panels, it is difficult to attain adequate ductility and stiffness to ensure structural integrity. Based on the authors’ previous research results, the supplementary reinforcement of embedded steel plates in precast concrete wall panels can enhance stiffness while maintaining allowable displacement and ductility. In this study, three full-size tilt-up precast concrete panels with embedded steel plates were fabricated. Lateral cyclic loads were applied to full support structures consisting of a precast concrete wall panel and a foundation. The test results were compared with the results predicted using existing code equations found in the American Concrete Institute 318-14 and the Prestressed Concrete Institute Handbooks. The test results confirm that the supplementary reinforcement of thin precast concrete wall panels can provide (i) the required strength based on current code equations, (ii) sufficient ductility, and (iii) the energy dissipation capacity to resist cyclic loading.

Highlights

Precast concrete wall panels typically have weak planes because the panels are relatively thin, and so their design is a critical consideration in determining the strength, stability, and integrity of the building in which they are used
A Prestressed Concrete Institute (PCI) committee report includes examples of details for connecting sandwich panels to foundations, to other framing members of the structure, and to other sandwich panels, but does not mention seismic considerations despite the fact that the seismic performance of tilt-up wall construction is closely related to its connection system [5,6,7]
Supplementary reinforcement is needed in thin precast concrete wall panels in order to enhance structural performance. These results indicated that the use of supplementary reinforcement and deeper embedment of the headed stud can lead to ductile behavior

Summary

Introduction

Precast concrete wall panels typically have weak planes because the panels are relatively thin, and so their design is a critical consideration in determining the strength, stability, and integrity of the building in which they are used. The seismic behavior of a precast sandwich panel structure depends significantly on the connection between the wall panel system and the foundation [1,2,3,4]. The embedded steel plate in the wall panel shows fairly rigid performance in the strength and inelastic phase, with some degree of energy dissipation capacity through ductile deformation [13,14]. Supplementary reinforcement is needed in thin precast concrete wall panels in order to enhance structural performance. These results indicated that the use of supplementary reinforcement and deeper embedment (hef) of the headed stud can lead to ductile behavior. This study investigated the effects of longitudinally reinforced bars welded to the embedded steel plates and the effects of gauge steel plates that were used to center each concrete tilt-up sandwich panel

Fabrication

Normalized Peak-To-Peak Stiffness Curve

Dissipation Energy Curve