Effect of Soil Constitutive Models and Slenderness Ratios of Piles on Seismic Performance of Moment-Resisting Frames Supported on Pile Foundation Considering Soil–Pile–Structure Interaction

Abstract

The type and size of the foundation play a significant role in the seismic response of the buildings. The present study investigates the influence of the length of pile foundation and aspect ratio of moment-resisting framed buildings resting over soft soil on the seismic response through numerical investigation. The present study uses two framed buildings of 15-and 25-story and deep foundations of different lengths (15 m, 20 m, 25 m, and 30 m). All the models are subjected to two near-field and two far-field earthquakes. The seismic response of the building has been estimated and expressed in terms of natural frequency, amplification factor, lateral displacement, interstory drift, base shear, and the rocking of the foundation. The lateral deflection, and bending moment along the length of piles are also investigated and presented. A comparison of the building and foundation response has also been made for elastoplastic, equivalent linear, and nonlinear soil behavior. This study shows that the length of the foundation, input ground motion, analysis methods, and aspect ratio of the building influence the response of the building significantly, when the effects of soil–structure interaction are considered. It is found that the lateral displacement, interstory drift, and rocking of the foundation has increased, for the range of parameters considered in the present study. Understanding the effect of soil constitutive models and pile slenderness ratios on seismic performance has several practical applications. Optimizing foundation design ensures that pile foundations are tailored to specific soil conditions, enhancing safety and cost-effectiveness. Improved seismic resilience is achieved through accurate modeling, which minimizes structural damage during earthquakes and protects occupants. For existing structures, this knowledge helps in assessing and upgrading foundations to improve seismic performance. Advanced seismic analysis benefits from realistic soil-structure interaction models, leading to more accurate predictions and better risk management in construction projects. Site-specific foundation solutions ensure optimal performance for critical infrastructure. In education, these insights enhance professional training programs and academic research, fostering further advancements in the field. Overall, these applications contribute to creating safer, more efficient, and cost-effective designs for high-rise buildings, while advancing engineering practices and standards.