Conference Agenda

The objective of this research is to analyze the variation in the seismic response of a six-story building with a shallow foundation by comparing a rigid base model with models that incorporate soil-structure interaction effects for different shear wave velocities in the soil. This work presents a quantitative approach with a descriptive-explanatory scope and a non-experimental, comparative-descriptive, ex post facto design. The sample is a six-story building with a shallow foundation, selected non-probabilistically for convenience. Data collection techniques included document analysis, analysis of specialized regulations, architectural and structural plans, soil mechanics studies, and the application of a basic mathematical model. Data processing was performed using Excel, ETABS V21.2, and Mathcad. The results showed a significant increase in drifts, displacements, and vibration periods. Furthermore, it was found that shear forces and moments at the base decrease as the shear wave velocity decreases. Finally, it was determined that soil-structure interaction generates variations in the seismic response of a six-story building with a shallow foundation subjected to different shear wave velocities. The variables of drift, displacement, and periods are primarily affected, showing a considerable increase, while internal forces decrease, compared to the fixed-base model.

This research compares the performance of self-compacting concrete (SCC) against conventional concrete in Honduras, focusing on fresh and hardened properties. The study addresses the limitations of traditional concrete, which requires vibration, increases labor costs, and risks poor consolidation in reinforced elements. SCC mixtures were designed following EFNARC and ACI 237R-07 guidelines, using locally available materials. Three dosages were prepared: a 4000 psi control, a mix with 20% cement replacement by porcelain powder, and another with 20% replacement plus a 10% sand reduction, both including superplasticizer. In fresh state, slump flow results were 45 cm for the control, 51 cm for the 20% porcelain mix, and 59 cm for the 20% porcelain + 10% less sand, confirming improved flowability with higher fines content. In hardened state, compressive strength at 7 days ranged from 4577 to 4678 psi, and at 14 days from 5259 to 5355 psi, surpassing conventional requirements. Results indicate SCC with porcelain powder is technically viable, offering superior workability, competitive strength, and constructive advantages such as reduced vibration, faster placement, and better surface quality.

A reassessment of urban planning towards a moral architecture based on resilience is proposed. The study focuses on the “Casitas Model,” a 200-hectare prototype in Tumbes, Peru. Using the PRISMA method, 10 Scopus Q1/Q2 articles were analyzed. The results highlight that decentralized sanitation and passive design, validated with 3D models, reduce vulnerability to El Niño and promote integral ecology

This experimental study evaluated the effect of adding pine seed ash (pine nuts) at percentages of 3%, 6%, and 9% on the dry density of a sandy soil using the modified Proctor test. The research stems from the need to find sustainable alternatives in civil engineering that allow for the utilization of plant residues and improve soil performance. The main objective was to determine how the density of sandy soil changes with the incorporation of pine nut ash and to evaluate its potential as a stabilization alternative. The study was conducted using a quantitative approach, employing 16 samples distributed into four experimental groups (0%, 3%, 6%, and 9% ash). The tests were performed according to the NTP 339.141 / ASTM D1557 standard, compacting each mixture in five layers and determining the maximum dry density and optimum moisture content from the resulting compaction curves. The results showed that the average dry density decreased with incorporation: 1.85 g/cm³ without ash, 1.78 g/cm³ with 3%, 1.67 g/cm³ with 6%, and 1.57 g/cm³ with 9%. This demonstrates that in the studied soil, pine nut ash does not improve compaction but rather reduces its capacity to achieve higher density values. It is interpreted that the interaction between the ash and the soil particles can alter the granular structure of the material, affecting how the particles arrange themselves during compaction. Therefore, determining the proportion of lignocellulosic residues is fundamental in sustainable geotechnical applications.

This research evaluated the effect of including hydrated lime at proportions of 5%, 10%, and 15% on the improvement of a sandy soil in the Cajamarca Department of Peru. The study employed an experimental methodology based on laboratory tests according to standardized technical norms: sieve analysis (ASTM D421), determination of consistency limits (Atterberg Limits), and modified Proctor compaction test (ASTM D1557). The results demonstrated that the addition of lime significantly modifies the soil properties, increasing the optimum moisture content for compaction from 12.72% (natural soil) to 13.91%, 15.10%, and 14.25% for the proportions of 5%, 10%, and 15%, respectively, while the maximum dry density showed values of 1.61, 1.60, 1.58, and 1.60 g/cm³ for the same proportions. It is concluded that a 5% lime ratio represents the most efficient alternative, maintaining an adequate dry density (1.60 g/cm³) with a moderate increase in optimum moisture content (13.91%), thus improving the compaction and stability of the sandy soil. These findings provide technical evidence for the use of lime as an economical and sustainable stabilizer in civil engineering projects in areas with sandy soils.