The role of microcracking on the compressive strength and stiffness of cracked concrete with different crack widths and angles evaluated by DIC

Miura, Taito; Sato, Katsuki; Nakamura, Hikaru

doi:10.1016/j.cemconcomp.2020.103768

Cited by 29 publications

(8 citation statements)

References 14 publications

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“…In the compression strut of a deep beam, a number of diagonal cracks parallel or having an angle to the direction of the principal compressive stress will show at the failure stage, and this complex stress-crack condition is very similar to the experimental conditions designed by and Miura et al (2020). There-fore, their findings can be incorporated with the stress condition of compression strut in RC deep beams, and it is deemed that the increase in the diagonal crack widths will lead to the reduction in the compressive strength of strut and also will have a certain influence on the reduction ratio under the condition of large crack width.…”

Section: Size Dependence Mechanism Of the Arch Actionmentioning

confidence: 64%

“…investigated the influence of a single axially distributed crack on the compressive strength of concrete by the compression test on cylinder or prism specimens, and found that the biggest compressive strength drop reaches approximately 30%, and if the crack width exceeds an upper value, no further deterioration occurs. Recently, also via compression tests on prism specimens, Miura et al (2020) introduced one single crack with a certain angle to the loading direction and confirmed the relationship between crack angle and width and concrete compressive strength. As a typical result, in the case of specimens with a crack parallel to loading direction, the biggest compressive strength drop reaches approximately 30% as crack width increases from 0 to 1.5 mm, and if the crack width exceeds the upper value, around 1.5 mm, no significant deterioration occurs.…”

Section: Size Dependence Mechanism Of the Arch Actionmentioning

confidence: 86%

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Numerical Evaluation of Shear Strength Degradation Mechanism Dependent on the Size Increase of RC Deep Beams with Height up to 1.5 Meter by Using 3D Rigid-Body-Spring-Method

Nakamura

Chi³

et al. 2021

ACT

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The purpose of this paper is to clarify the mechanism of shear strength reduction for reinforced concrete deep beams with varying stirrup ratios, due to the beam size increase. Three Dimensional Rigid-Body-Spring-Method was the applied numerical tool. By using the simulation results of reinforced concrete deep beams with the effective depth smaller than 1500 mm, the size dependence of each shear resistance component such as arch, beam and truss actions were investigated, along with the size dependence of localized information such as crack pattern, diagonal crack width and compressive stress. It was revealed that the size effect on shear strength results from the size dependence of the arch action, and the change of stirrup ratio does not show any inhibiting effects on it. The crucial reason for the size effect on the arch action is the size dependence of concrete compressive resultant on beam cross sections, and the critical diagonal crack width, which increases with beam size, is a key factor for the deterioration of concrete compressive strength and the capacity of compressive stress in struts. Moreover, it was found that the critical diagonal crack width not only affects the normalized shear strength, but also has influence on the post-peak behavior of deep beam.

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Section: Size Dependence Mechanism Of the Arch Actionmentioning

confidence: 64%

Section: Size Dependence Mechanism Of the Arch Actionmentioning

confidence: 86%

Numerical Evaluation of Shear Strength Degradation Mechanism Dependent on the Size Increase of RC Deep Beams with Height up to 1.5 Meter by Using 3D Rigid-Body-Spring-Method

Nakamura

Chi³

et al. 2021

ACT

Self Cite

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“…Miura và cs. [11] sử dụng phương pháp DIC để xác định các Hình 1. Áp dụng DIC để xác định thời điểm nứt do biến dạng co ngót của bê tông [9] microcracking trên cấu kiện BTCT chịu nén.…”

Section: đặT Vấn đềunclassified

Nghiên cứu thực nghiệm áp dụng phương pháp tương quan điểm ảnh (DIC) trong đo đạc chuyển vị của dầm bê tông cốt thép làm việc chịu uốn

Quang¹,

Hiếu²,

Lành³

et al. 2021

TCKHCNXD

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Phương pháp tương quan điểm ảnh (DIC) là phương pháp quang học, sử dụng máy ảnh kỹ thuật số ghi lại những thay đổi trên bề mặt mẫu thí nghiệm trước và sau khi biến dạng. Từ việc theo dõi và so sánh vị trí của các pixcel có thể tính toán ra các thông số biến dạng và chuyển vị của mẫu thí nghiệm. Nội dung của bài báo trình bày kết quả nghiên cứu thực nghiệm ứng dụng phương pháp DIC để khảo sát chuyển vị của kết cấu dầm bê tông (BT) và dầm bê tông cốt thép (BTCT) chịu uốn. Các giá trị chuyển vị xác định bằng phương pháp DIC được so sánh với kết quả đo trực tiếp bằng dụng cụ đo chuyển vị điện tử (LVDTs). Kết quả thu được cho thấy khi đo trên mẫu dầm BT và dầm BTCT thì chênh lệch của hai phép đo lần lượt bằng 14% và 8%. Những kết quả này cho thấy hoàn toàn có thể sử dụng phương pháp DIC cho việc đo đạc chuyển vị của kết cấu BTCT đặc biệt trong các trường hợp đo đạc tại hiện trường khi mà phương pháp đo chuyển vị truyền thống không đáp ứng được.

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“…Hence, DIC can detect and monitor crack propagation in concrete even prior to crack appearance. This method has been used to analyze crack propagation, and the effect of crack widths and angles, on the performance of concrete (Chen et al 2018;Teramoto et al 2018;Miura et al 2020). Researchers have also used DIC to study bond behavior at the interface between concrete and a steel bar (Leibovich et al 2015(Leibovich et al , 2018Okeil et al 2020;Avadh et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Analysis of Non-uniform Local Strain in Corroded Reinforcing Bar in Concrete using Digital Image Correlation

Peng

Avadh

Nagai

2023

ACT

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Change in the mechanism of post corrosion bond behavior was investigated in a previous experimental study by analyzing the deformations in concrete using digital image correlation (DIC). Using their DIC data, this study focuses on the local strain non-uniformity in reinforcing bar during the uniaxial tensile test due to the effect of rib height reduction and corrosion layer. The results show that, the local strain below the rib tip is higher than that below the flat part between ribs, due to compressive stress resulting from mechanical interaction at the rib tip. Furthermore, the non-uniformity in local strain is less pronounced in highly corroded reinforcing bar because less compressive stress is transferred due to gentler rib slope. In highly corroded reinforcing bar, the appearance of non-uniformity in local strain is delayed since the accumulated corrosion product on the reinforcing bar surface delays the mechanical interaction and stress transfer between the concrete and the reinforcing bar.

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The role of microcracking on the compressive strength and stiffness of cracked concrete with different crack widths and angles evaluated by DIC

Cited by 29 publications

References 14 publications

Numerical Evaluation of Shear Strength Degradation Mechanism Dependent on the Size Increase of RC Deep Beams with Height up to 1.5 Meter by Using 3D Rigid-Body-Spring-Method

Numerical Evaluation of Shear Strength Degradation Mechanism Dependent on the Size Increase of RC Deep Beams with Height up to 1.5 Meter by Using 3D Rigid-Body-Spring-Method

Nghiên cứu thực nghiệm áp dụng phương pháp tương quan điểm ảnh (DIC) trong đo đạc chuyển vị của dầm bê tông cốt thép làm việc chịu uốn

Analysis of Non-uniform Local Strain in Corroded Reinforcing Bar in Concrete using Digital Image Correlation

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