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Mumenya, Siphila
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Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Energy Industrial & Manufacturing Engineering Mechanical Engineering

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A comparative study of the dynamic earthquake behaviour of braced tube, diagrid, tube-in-tube, and shear wall-frame structures Oduor, Grant; Abuodha, Silvester; Mumenya, Siphila
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 3 No. 1 (2023): March 2023
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Recent trends show that tubular systems are already popular for tall buildings in most regions of the world; the shear wall-frame system is also dominant in other parts of the globe. This study aimed to compare the dynamic earthquake behaviour of braced tube, diagrid, tube-in-tube, and shear wall-frame structures. This research study used ETABS software to model, analyze, and design 12 building models, whereby every structural system was comprised of 12-, 24-, and 36-story models. The constant model parameters were as follows: the floor slab depth and area, the service area, the plan dimensions, the story heights, and materiality. The research used modal response spectrum analysis per EN 1998-1-1:2004 for the Nairobi city area in Kenya to obtain the fundamental periods of vibration, top drifts, seismic base shears, and top floor accelerations of the braced tube, diagrid, tube-in-tube, and shear wall-frame models. The dynamic earthquake behaviour of the aforementioned lateral systems with different heights is illustrated. The study recommends the use of diagrid systems for seismic load resistance in 12-, 24-, and 36-story buildings with regular plan geometry. Keywords: Fundamental period of vibration, top drift, seismic base shear, top floor acceleration, modal response spectrum analysis, tall buildings.
Prediction of the Residual Compressive Strength of Rice Husk Ash Concrete after Exposure to Elevated Temperatures Using XGBoost Machine Learning Algorithm Ang'ang'o, Elvis; Abuodha, Silvester; Mumenya, Siphila
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 4 No. 3 (2024): November 2024
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v4i3.187

Abstract

The study aimed to assess the applicability of XGBoost in determining the residual compressive strength of rice husk ash concrete exposed to elevated temperature, reducing the need for costly, time-consuming laboratory experiments. Data was collected from the available literature, with 75% used for training and 25% for testing. Synthetic data was created using the Wasserstein Generative Adversarial Network with Gradient Penalty (WGAN-GP). The model accuracy was checked using statistical scores: coefficient of determination (R2), root mean squared error (RMSE), and mean absolute error (MAE). SHAP values were used for feature importance analysis. Coding was done in Python using Jupyter Notebook. With the original data, the model produced RMSE, R2, and MAE test values of 3.351, 0.939, and 2.994, respectively, indicating excellent performance. The combined original and synthetic dataset gave RMSE, R2, and MAE values of 0.071, 0.941, and 0.053, respectively, signifying improved performance. The feature analysis identified higher temperature, unheated compressive strength, and water-cement ratio as the most significant factors in the XGBoost prediction. The exposure duration, alumina content, and iron oxide had minimal influence.
Prediction of the Residual Compressive Strength of Rice Husk Ash Concrete after Exposure to Elevated Temperatures Using XGBoost Machine Learning Algorithm Ang'ang'o, Elvis; Abuodha, Silvester; Mumenya, Siphila
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 4 No. 3 (2024): November 2024
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v4i3.187

Abstract

The study aimed to assess the applicability of XGBoost in determining the residual compressive strength of rice husk ash concrete exposed to elevated temperature, reducing the need for costly, time-consuming laboratory experiments. Data was collected from the available literature, with 75% used for training and 25% for testing. Synthetic data was created using the Wasserstein Generative Adversarial Network with Gradient Penalty (WGAN-GP). The model accuracy was checked using statistical scores: coefficient of determination (R2), root mean squared error (RMSE), and mean absolute error (MAE). SHAP values were used for feature importance analysis. Coding was done in Python using Jupyter Notebook. With the original data, the model produced RMSE, R2, and MAE test values of 3.351, 0.939, and 2.994, respectively, indicating excellent performance. The combined original and synthetic dataset gave RMSE, R2, and MAE values of 0.071, 0.941, and 0.053, respectively, signifying improved performance. The feature analysis identified higher temperature, unheated compressive strength, and water-cement ratio as the most significant factors in the XGBoost prediction. The exposure duration, alumina content, and iron oxide had minimal influence.
Effectiveness of Carbon Fibre Reinforced Polymer (CFRP) & Textile Reinforced Mortar (TRM) Strengthening on Circularised Non-Slender Reinforced Concrete Columns Ochieng, Victor; Abuodha, Silvester; Mumenya, Siphila
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 5 No. 1 (2025): March 2025
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v5i1.218

Abstract

This research paper presents an experimental investigation into the effectiveness of Carbon fibre Reinforced Polymer (CFRP) and Textile Reinforced Mortar (TRM) for strengthening circularized non-slender reinforced concrete columns. The experiment examined the following parameters cross-section shape namely; - square, circular, and circularized, the strengthening material i.e. CFRP or TRM, and the number of wrapping layers of the strengthening material (one and two layers).  45 specimens were prepared, given various treatments, strengthened, and loaded uniaxially until failure.  The specimens were categorised into three series based on their cross-section geometry; - circular, square, and circularized. The results showed that the circular specimens recorded the highest axial capacity followed by the circularized specimens while the square specimens recorded the least axial capacity, CFRP confinement was more effective compared to TRM confinement in enhancing the axial capacity and ductility, and doubling the number of both CFRP and TRM layers from 1 to 2 resulted in a significant increase in both the axial capacity and ductility of the specimens. Consequently, the gain in axial capacity and the ductility of the strengthened specimens was sensitive to the number of wraps and the strengthening material. It was also noted that the failure modes of the specimens differed depending on the cross-section geometry. From the findings of this study, it is believed that circularisation and confinement using TRM & CFRP is a promising solution for retrofitting inadequate square columns.
The Mechanical Properties of a High Volume Natural Pozzolan Roller Compacted Concrete for Dams – Laboratory and Field Trials Karuge, Amos; Mumenya, Siphila; Abuodha, Silvester; Munyua, Muthomi
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 5 No. 2 (2025): July 2025
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v5i02.244

Abstract

This article reports the experimental findings of critical thermo-mechanical properties of RCC containing a high proportion of natural pozzolan as a supplementary cementitious material for Roller Compacted Concrete (RCC) dam construction, and was accomplished through laboratory and field trials. Natural pozzolan such as volcanic ash is a promising alternative to the industrial supplementary cementitious materials (SCM) such as flyash especially where the industrial SCM are economically unavailable as well as due to their expected shortage in the near future following greener energy sources and the need to reduce carbon emissions of concrete. Based on this research, the RCC with a cement replacement of up to 68% with natural pozzolan has produced satisfactory mechanical properties for dam construction and with nearly ideal thermal properties. The results are comparable to other international RCC dams and the RCC mix is considered appropriate for construction of a high quality and durable dam structure whilst contributing to sustainable construction.
A comparative study of the dynamic earthquake behaviour of braced tube, diagrid, tube-in-tube, and shear wall-frame structures Oduor, Grant; Abuodha, Silvester; Mumenya, Siphila
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 3 No. 1 (2023): March 2023
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Recent trends show that tubular systems are already popular for tall buildings in most regions of the world; the shear wall-frame system is also dominant in other parts of the globe. This study aimed to compare the dynamic earthquake behaviour of braced tube, diagrid, tube-in-tube, and shear wall-frame structures. This research study used ETABS software to model, analyze, and design 12 building models, whereby every structural system was comprised of 12-, 24-, and 36-story models. The constant model parameters were as follows: the floor slab depth and area, the service area, the plan dimensions, the story heights, and materiality. The research used modal response spectrum analysis per EN 1998-1-1:2004 for the Nairobi city area in Kenya to obtain the fundamental periods of vibration, top drifts, seismic base shears, and top floor accelerations of the braced tube, diagrid, tube-in-tube, and shear wall-frame models. The dynamic earthquake behaviour of the aforementioned lateral systems with different heights is illustrated. The study recommends the use of diagrid systems for seismic load resistance in 12-, 24-, and 36-story buildings with regular plan geometry. Keywords: Fundamental period of vibration, top drift, seismic base shear, top floor acceleration, modal response spectrum analysis, tall buildings.
Influence of Corn Cob Ash-Silica Fume Blend on the Mechanical and Durability Properties of Concrete Otieno, Linda Akoth; Abuodha, Sylvester; Mumenya, Siphila; Munyua, Muthomi
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 3 No. 2 (2023): July 2023
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v3i2.86

Abstract

— This research explored the feasibility of corn cob ash-silica fume blend in the production of pozzolanic cement to produce High-Performance Concrete. The cement in concrete was partially replaced by corn cob ash-silica fume blend in 5,10,15 and 20% by weight of cement and was compared to a control mix of 0% replacement. An intelligent mix design, Densified Mix Design Algorithm (DMDA), was used to effectively reduce both water and cement content. In order to create high strength and workability, a polycarboxylate-based super plasticizing admixture was utilized in conjunction with a low water binder ratio of 0.35. Compressive strength was appraised to determine the mechanical properties at days 3,7,14,28 and 56 to determine the optimum percentage replacement and compared to the control at the specific ages. With the optimum percentage replacement, the flexural test was investigated at 28 days. Water absorption and electrical resistivity tests were also investigated as potential indicators of durability. All of the blends that included corn cob ash and silica fume produced a higher strength than the control except 15 and 20%, with 10% replacement yielding a cube strength of 61 MPa at day 56.
Co-Authors Abuodha, Silvester Abuodha, Sylvester Ang'ang'o, Elvis Karuge, Amos Munyua, Muthomi Ochieng, Victor Oduor, Grant Otieno, Linda Akoth