Performance evaluation and numerical model development of cast-in-anchor subjected to freeze-thaw and combined load

초록

In construction, anchors for concrete are essential devices that connect structural and non-structural components to concrete structures. However, in many numerical analyses, anchor connections are interpreted with fixed or restrained boundary conditions, and anchors are separately evaluated for tension and shear loads according to ACI 318 standards. Numerous studies evaluating anchor performance have been conducted since the 1970s, leading to formalization and standardization based on various research findings to date. However, research on the load-displacement relationship of anchors is still insufficient, especially regarding the development of numerical models for anchor systems based on this relationship. Additionally, recent studies indicate significant degradation in anchor performance under repetitive freeze-thaw exposure conditions for post-installed anchors, whereas performance evaluations under such conditions have not been conducted for cast-in-place anchors. Therefore, this study conducted to: 1) analyze the load-displacement relationship of anchors subjected to combined tensile and shear loads, 2) analyze changes in concrete strength and anchor performance due to freeze-thaw exposure, and 3) propose and compare a numerical model for anchors that simulates the load-displacement relationship based on anchor test results. As result of this study, confirmed that concrete compressive strength varies with freeze-thaw cycles, leading to decreased performance of cast-in-place anchors. Furthermore, the proposed numerical model for anchors confirmed significant alignment with experimental results in terms of peak load and deformation energy within specific displacement ranges.

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