Publication
Abstract:Earthquakes pose significant risks to buildings in seismically active regions, and evaluating structural performance under lateral loads is essential, particularly for irregular buildings that are more susceptible to torsional effects and nonuniform deformation. This study contributes comparative evidence on the influence of shear wall placement on seismic response parameters of irregular reinforced concrete buildings using nonlinear pushover analysis. Structural parameters were modeled in ETABS v19 in accordance with ACI 318-19, AISC 360-10, and NSCP 2015. Pushover curves in both the X and Y directions were generated to identify first-hinge formation, performance-point capacities, plastic-hinge distribution, and performance indicators such as displacement demand, acceleration response, and fundamental period. Statistical tests (ANOVA and Post Hoc) were conducted to determine significant differences among the three designs. Findings show that the corner configuration achieved the highest base shear capacity but was more torsionally sensitive. The inner-center layout produced the largest displacements and longest time periods, indicating higher flexibility but reduced drift control. The outer-center configuration demonstrated the most balanced response, with efficient drift reduction, moderate stiffness, fewer critical hinges, and performance consistently within Immediate Occupancy limits. These results confirm that shear wall placement significantly influences structural behavior, especially in irregular building forms. Overall, the outer-center layout demonstrated the most balanced seismic response among the configurations assessed.
Keywords:lateral deformation, pushover capacity, structural irregularity, drift performance, nonlinear seismic assessment
Abstract:Persistent problems stem from factors such as the difficulty of waste recycling wherein plastics are substantial contributors having strong environmental impact. To mitigate this dilemma, reengineered plastics are emerging as reforms in solving solid waste management issues. This study aimed to investigate the effects of utilizing Polyethylene terephthalate (PET) as an admixture in a non-load-bearing concrete masonry unit. Moreover, it sought to limit the amount of environmental degradation and prevent ecological and environmental strains caused by plastic. This study used the experimental method which involved compressive strength testing, unit weight, and unit cost analysis. In addition to this, the properties of the materials were studied to arrive at the optimum percent composition to generate the highest efficiency. Five treatments were utilized including the control (0%), 1.5%, 2.0%, 2.5%, and 3.0% PET waste admixture. In the findings, both the control CMU and the 1.5% PET waste admixture have qualified on the standard specification, ASTM C129, for CMU compressive strength. The unit weight decreases as the amount of admixture increases. In terms of unit cost, the sample with the highest percentage of PET waste has the lowest unit cost but with the lowest compressive strength. However, between the control CMU and the 1.5% PET waste admixture, the latter has a lower unit cost. Therefore, it can be inferred that adapting the use of PET wastes as admixture at 1.5% showed the most competence proving to reduce plastic waste environmental issues while gaining higher possible profit when introduced into the commercial industry of construction supplies. For future studies, a Comparative Analysis of walls made with plain and PET waste concrete masonry units may be conducted to improve the application of the material.
Keywords:Polyethylene Terephthalate (PET), Concrete Masonry Unit (CMU),Admixture
Abstract:This study explored the innovative use of Recycled Concrete Aggregate (RCA) combined with Super Absorbent Polymers (SAP) as a sustainable alternative to Natural Aggregate (NA) in concrete production. Addressing the traditional limitation of RCA usage to 30% due to water absorption and reduced strength, this research successfully increased the RCA content to 50% using a Two-Stage Mixing Approach (TSMA). Three concrete mixtures were tested: conventional concrete and two mixtures containing 50% RCA and 50% NA, incorporating 0.11% and 0.3% SAP by cement weight. Compressive and flexural strength tests conducted on cylindrical and beam samples after 28 days revealed that the flexural strength of the recycled concrete mixtures was comparable to that of traditional concrete, meeting the standards set by the Department of Public Works and Highways (DPWH). Notably, the mixture with 50% RCA, 50% NA, and 0.3% SAP achieved the highest compressive strength, surpassing the American Concrete Institute (ACI) standard of 17 MPa (2500 PSI). These findings highlighted the potential of TSMA and SAP to enhance the structural performance of RCA-based concrete, making it a viable and sustainable alternative to conventional concrete. This study introduced a novel method for increasing RCA utilization in structural applications, significantly reducing construction waste and promoting environmentally sustainable practices in the construction industry.
Keywords:Recycled Concrete Aggregate, Super Absorbent Polymers, Two-Stage Mixing Approach
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- Labor Productivity in Metro Vigan Road Construction and Strategies for Improvement (2025)
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