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Htwe, Khin Su Su
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Chemical Engineering, Chemistry & Bioengineering Education Engineering Mechanical Engineering

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Experimental investigation of the infill response under the inter-story drift level for different opening location Htun, Hsu Nandar; Htwe, Khin Su Su
Journal of Engineering Researcher and Lecturer Vol. 3 No. 2 (2024): Regular Issue
Publisher : Researcher and Lecturer Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58712/jerel.v3i2.155

Abstract

This paper investigates the response of infilled frames associated with inter-story drift ratio considering the central and eccentric window opening under the in-plane force. The behavior of the structure was studied by experimental and numerical approach. Experimental results show that the lateral load capacity in eccentric window frame (EW) is 1.17 times of central window frame (CW due to interruption of diagonal loaded action by the central opening. The elastic condition of CW frame and EW frame is obtained at lateral drift of 0.2% and 0.4% respectively. As a result of weak mortar interaction, the diagonal action of crack distribution emerges along the corner of the panel in testing A numerical simulation was performed and validated with experimental results. As the comparison of results, the elastic limit points coincide between the two approaches of numerical and experimental. However, the slightly difference occurs at the peak point. The similarity can be seen in the range of 80% to 100% in the value of peak load and displacement at peak load. The numerical investigation revealed that the highest stress distribution occurred along the diagonal axis, aligning with the results of the experimental investigation.
Experimental study on strength reduction due to corrosion in reinforced concrete slabs with and without steel fibers Kyu, Hnin Hnin; Htwe, Khin Su Su
Innovation in Engineering Vol. 2 No. 1 (2025): Regular Issue
Publisher : Researcher and Lecturer Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58712/ie.v2i1.21

Abstract

Corrosion significantly affects deterioration in reinforced concrete structural members, severely compromising their strength and durability, especially in regions with heavy rainfall and exposure in coastal areas. Currently, steel fibers have been increasingly used in the construction industry because of their enhanced durability, crack resistance and overall structural performance and it’s been emphasized for more research. Moreover, most previous studies have focused on corrosion damage in reinforced concrete slabs and beams, further research is needed to study the behavior of corrosion in RC slabs with steel fibers and the proneness of steel fibers to corrosion. This study aims to experimentally evaluate the impact of corrosion on the flexural strength and durability of steel fiber-reinforced concrete (SFRC) slabs comparing with conventional reinforced concrete (RC) slabs. An accelerated corrosion process was applied using a 5% sodium chloride electrolyte solution and a 5V output over 240 days. Corrosion levels in the slabs were assessed by using the Cor-Map technique. The results indicated that SFRC slabs exhibited higher corrosion levels than conventional RC slabs, likely due to the increased exposed area from the distributed steel fibers. The results of experimental flexural strength tests showed that the percentage reduction in flexural strength of the SFRC slab was greater than that of the conventional RC slab after corrosion. Although SFRC slabs exhibited faster corrosion due to the presence of steel fibers, fiber corrosion did not contribute to the corrosion of main steel bars and these slabs performed better than conventional RC slabs in terms of flexural strength and crack resistance in both before and after corrosion. According to this experimental research, the behavior of steel fiber corrosion in RC slabs is well known, and it showed that steel fibers could be effectively used in RC slabs and these results provided a valuable reference for assessing the residual capacities of existing steel fibers reinforced concrete slabs affected by corrosion.
Experimental study on damping properties of concretes under free vibration with different tyre wastes Win, Cho Zin; Htwe, Khin Su Su; Kyaw, Nyan Myint
Innovation in Engineering Vol. 2 No. 1 (2025): Regular Issue
Publisher : Researcher and Lecturer Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58712/ie.v2i1.25

Abstract

Disposing of waste tires presents environmental challenges, making recycling into crumb rubber a sustainable solution, especially in developing countries. Moreover, concrete tends to be brittle, and incorporating crumb rubber enhances its energy absorption, which can help reduce the concrete’s brittleness. This study examines the effects of replacing fine aggregates with crumb rubber at 5% and 10% on concrete properties. Two types of crumb rubbers were used namely, low-quality and high-quality crumb rubber treated with CH3COOH solution. Results show that 5% crumb rubber improves compressive strength, and elastic modulus, while these properties decrease at 10% replacement. Free vibration tests using the logarithmic decrement method showed that higher rubber content increases the damping ratio, with 10% replacement yielding the best energy dissipation. Simulation using ANSYS Workbench validated the experimental findings, with natural frequencies and load-displacement behaviors closely matching experimental results. Using 5% crumb rubber enhances compressive strength, damping, and energy absorption, making concrete more versatile. This eco-friendly alternative supports sustainable construction while addressing tire waste disposal, highlighting its potential for dynamic load applications.
Comparative study on energy absorption capacities of normal and rubberized concrete columns under sinusoidal wave Win, Cho Zin; Htwe, Khin Su Su; Kyaw, Nyan Myint
Journal of Engineering Researcher and Lecturer Vol. 4 No. 2 (2025): Regular Issue
Publisher : Researcher and Lecturer Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58712/jerel.v4i2.183

Abstract

This research explores the use of rubberized concrete composite as an innovative structural material designed to improve energy dissipation and enhance seismic resistance by incorporating recycled rubber crumb into concrete. A reference test model was constructed using normal concrete, while the remaining models were made from concrete in which a portion of the fine aggregates was partially replaced with crumb rubber particles. Lumped mass columns were tested on a shaking table using sine wave excitation to evaluate dynamic behaviour and seismic response with 4 Hz sinusoidal base motion. Acceleration measurements were obtained and analysed in MATLAB using Fast Fourier Transform (FFT), allowing for comparison between normal and rubberized concrete specimens. The results indicated that as the rubber content in the concrete increased, the frequency of the columns decreased under base excitation. Additionally, three-dimensional finite element simulations of lumped mass column models were conducted in ANSYS. Linear dynamic analysis was conducted to assess the system’s behaviour when subjected to harmonic loading. In addition, resonance conditions were also considered to assess the dynamic interaction of the column. With higher rubber content, the acceleration response is reduced due to the enhanced damping and energy absorption capabilities of rubberized concrete, leading to a significant decrease in peak acceleration values.
Experimental investigation of the infill response under the inter-story drift level for different opening location Htun, Hsu Nandar; Htwe, Khin Su Su
Journal of Engineering Researcher and Lecturer Vol. 3 No. 2 (2024): Regular Issue
Publisher : Researcher and Lecturer Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58712/jerel.v3i2.155

Abstract

This paper investigates the response of infilled frames associated with inter-story drift ratio considering the central and eccentric window opening under the in-plane force. The behavior of the structure was studied by experimental and numerical approach. Experimental results show that the lateral load capacity in eccentric window frame (EW) is 1.17 times of central window frame (CW due to interruption of diagonal loaded action by the central opening. The elastic condition of CW frame and EW frame is obtained at lateral drift of 0.2% and 0.4% respectively. As a result of weak mortar interaction, the diagonal action of crack distribution emerges along the corner of the panel in testing A numerical simulation was performed and validated with experimental results. As the comparison of results, the elastic limit points coincide between the two approaches of numerical and experimental. However, the slightly difference occurs at the peak point. The similarity can be seen in the range of 80% to 100% in the value of peak load and displacement at peak load. The numerical investigation revealed that the highest stress distribution occurred along the diagonal axis, aligning with the results of the experimental investigation.
Comparative study on energy absorption capacities of normal and rubberized concrete columns under sinusoidal wave Win, Cho Zin; Htwe, Khin Su Su; Kyaw, Nyan Myint
Journal of Engineering Researcher and Lecturer Vol. 4 No. 2 (2025): Regular Issue
Publisher : Researcher and Lecturer Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58712/jerel.v4i2.183

Abstract

This research explores the use of rubberized concrete composite as an innovative structural material designed to improve energy dissipation and enhance seismic resistance by incorporating recycled rubber crumb into concrete. A reference test model was constructed using normal concrete, while the remaining models were made from concrete in which a portion of the fine aggregates was partially replaced with crumb rubber particles. Lumped mass columns were tested on a shaking table using sine wave excitation to evaluate dynamic behaviour and seismic response with 4 Hz sinusoidal base motion. Acceleration measurements were obtained and analysed in MATLAB using Fast Fourier Transform (FFT), allowing for comparison between normal and rubberized concrete specimens. The results indicated that as the rubber content in the concrete increased, the frequency of the columns decreased under base excitation. Additionally, three-dimensional finite element simulations of lumped mass column models were conducted in ANSYS. Linear dynamic analysis was conducted to assess the system’s behaviour when subjected to harmonic loading. In addition, resonance conditions were also considered to assess the dynamic interaction of the column. With higher rubber content, the acceleration response is reduced due to the enhanced damping and energy absorption capabilities of rubberized concrete, leading to a significant decrease in peak acceleration values.
Experimental evaluation of damage state and failure propagation of infilled frames under the opening effect Htun, Hsunandar; Htwe, Khin Su Su
Innovation in Engineering Vol. 1 No. 2 (2024): Regular Issue
Publisher : Researcher and Lecturer Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58712/ie.v1i2.11

Abstract

In this study, four frame specimens were tested: two with concentric window and door openings in the infills, and two with eccentric window and door openings. The serviceability limit of the infilled state was determined by evaluating the structural behaviour of infilled reinforced concrete frames with openings. The results indicate that frames with centrally located openings exhibit a reduction in lateral load capacity. The damage characteristics are influenced more by the location of the opening than by its percentage. When the opening is positioned closer to the edge of the masonry panel, the structural performance improves. Initial cracking occurs at a lateral drift of 0.2%, while crushing of the masonry panel occurs at approximately 2%. In frames with centrally located openings, the segment near the loaded column is more prone to damage, whereas the segment farther from the loaded column shows increased vulnerability.
Co-Authors Htun, Hsu Nandar Htun, Hsunandar Kyaw, Nyan Myint Kyu, Hnin Hnin Win, Cho Zin