Mechanical characteristics and structural assessment of historic masonry structures retrofitted by Korean traditional building materials = 한국 전통재료로 보수된 역사적 조적 구조물의 기계적 특성 및 구조적 평가
Historical building preservation often involves best-guess practices of repairing and reinforcing when knowledge of the original materials and construction techniques is incomplete. Starting from the Three Kingdoms period (18 BCE–660 CE) in Korea, brick and lime mortar used to be widely used as construction materials. Maintaining and preserving historical structures entails obstacles attributed to the erosion and decaying process of the materials they were built from. Traditional manufacturing techniques for brick and lime materials were interrupted by the Japanese occupation of Korea (1910–1945), and much of the knowledge of those techniques has been lost, meaning it has been difficult to implement optimal preservation procedures. In addition, the development and subsequent dominance of cement mortar has also contributed to the decline of techniques and studies involving the use of traditional materials. Much evidence has shown
that inappropriate or overuse of modern cement mortar leads to local damage in previously unaffected areas of a historical structure. In order to improve preservation practices, more research on traditional domestic bricks and lime mortar is needed. This dissertation presents the experimental analyses of the mechanical characteristics of traditional brick and lime mortar, which are considered to be materials suited for use in the repair and reinforcement of historical structures. Numerical analyses of a real pagoda using finite element modeling are also introduced and discussed. The experimental process consisted of material sample and specimen tests. First, two types of bricks and three types of mortar were selected. Ten types of mortar mixing ratios were also chosen as research parameters. Several examinations of the microstructure characteristics, including via XRD, SEM, MIP, and BET, were performed to assess the material properties of each brick and mortar type in detail. Second, masonry specimens constructed from those bricks and mortar types were tested in order to analyze their structural behaviors. Specifically, prism compressive strength, horizontal joint shear strength, and sinusoidal shear strength experiments were performed. Based on the experimental results,
basic data and information for use in the maintenance of historical structures were presented and evaluated. Finally, based on the experiments conducted in the first and second phases, optimal repairing materials for use in the maintenance of historical structures were selected by analyzing the structural behavior of the bricks and the lime mortar. The experimental results were employed to develop a finite element analysis model of a pagoda. The seismic response of the pagoda was obtained by performing nonlinear time history analysis using several earthquake data. The structural stability of the structure repaired with the optimal materials was then evaluated.
The results of this study are as follows:
1. Mechanical properties and microstructure of Korean traditional bricks and mortar
○ The factory-made brick used the same materials as the hand-made brick, but showed dissimilarity in mineral composition and microstructure analysis due to differences in manufacturing methods. This characteristic also caused an unlikeness in compressive strength.
○ In the compressive test, the CL mortar sample had the highest strength, and the PL mortar had the lowest strength. As a result of XRD analysis, the Portlandite reaction did not proceed completely at a mixing ratio of
1:1, so it was judged that the strength would improve, even after 56 days.
○ The aggregate content was related to the formation of pores in the mortar, and as the aggregate content increased, more voids were found between minerals, according to SEM analysis. Consequently, the amount of aggregate in the mortar was inversely proportional to its compressive strength.
○ Quicklime lumps revealed small pores and specific surface area compared with slaked lime. Powdered hydrated lime and commercial hydrated lime have similar porosity; however, the specific surface area of commercial hydrated lime is larger, and it can be inferred that its properties affect mortar strength.
2. Performance evaluation of masonry structures
○ Lime mortar differs from cement mortar in that the compressive strength and adhesive strength of the mortar are not proportional.
○ The strength of the factory-made brick was good in the masonry prism test, and the strength of the hand-made brick was high in the triplet shear and diagonal compression tests. In the triplet shear and diagonal compression tests, it was observed that the bond strength between the mortar and the brick had a significant influence, and the rough surface of the hand-made brick affected the enhancement of the shear strength when compared with the factory-made brick.
○ The influence of the brick was greater than the lime mortar in the masonry prism test.
○ In the diagonal compression test, the greater the difference in strength between the brick and mortar, the weaker the correlation between the compressive strength and diagonal shear strength. It was found that the adhesion strength between the brick and mortar had a greater effect.
3. Numerical simulation and analysis of a masonry pagoda
○ The centrifuge test and analysis results were compared to examine the reliability of ANSYS, a finite element analysis software program. The difference was around 1%, which was thought to be due to the setting process of the specimen and multiple experiments with one model.
○ The safety of the pagoda was indirectly reviewed by measuring the natural frequency of the multistory brick pagoda of Silleuksa Temple using Blastmate II. The natural frequency was 5.81 Hz, and it was measured as having a strength similar to that of a stone pagoda. As a result of estimating the elastic modulus based on natural frequency, the strength of the brick and mortar was estimated to be 534 MPa.
○ The safety evaluation of the tower was investigated in consideration of the material strength and the effect of the inner filler (jeoksim). As the material stiffness increased, the displacement decreased and the natural frequency increased. When the stiffness of the inner filler increased, the displacement decreased and the natural frequency increased. In addition, when the inner filler content was greater than sand–gravel, it was judged that there was no major problem with the stability of the structure.
○ When the nonlinear time history analysis was analyzed to investigate the seismic safety of the multistory pagoda of Silleuksa, a large PGA(Peak ground acceleration) occurred at the top of the structure, and the interstory displacement ratio exceeded the KDS 2019 standard.
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