Development of a low-cost portable IoT seismic table for simulation and analysis in civil engineering

Abstract

The study of structural behavior in response to seismic events is fundamental for civil engineering and risk management. However, many institutions have limited access to seismic simulation equipment due to its high cost, preventing the development of experiments that complement conceptual learning. This work presents research advancements on developing a low-cost portable seismic table, designed for simulating ground movements and accessible for research and educational laboratories. The platform is based on a microcontroller and a stepper motor, enabling the reproduction of real seismic signals. A motion control system optimized with a sinusoidal function is employed, and to ensure simulation accuracy, the system uses digital signal processing. The seismic table includes a library of preloaded earthquakes, allowing users to replay historical records without requiring an external connection. This feature facilitates its use in educational and experimental environments, as users can select and execute different seismic scenarios instantly. Additionally, the system incorporates the Internet of Things (IoT), enabling wireless connectivity for remote management of the seismic table through a web browser. This feature simplifies experiment control without requiring a physical connection, allowing users to modify parameters and execute simulations efficiently.

Currently, the seismic table is undergoing testing, where motion accuracy is being validated using acceleration and displacement sensors. The obtained data is compared with original seismic records to ensure simulation fidelity. The table is expected to reproduce seismic frequencies from 0.5 Hz to 10 Hz and a maximum amplitude of 60 mm, covering a useful range for simulating various types of earthquakes. The design is characterized by its portability, allowing for easy transportation due to its compact size. It is ideal for educational and research applications in resource-limited environments. Its implementation in universities will enable students to conduct experimental tests that complement their theoretical studies in structural dynamics. Moreover, it can be used in the development of seismic risk mitigation models, contributing to the design of more resilient infrastructure. The developed seismic table represents a breakthrough in democratizing seismic engineering research, offering a low-cost solution with digital connectivity, preloaded earthquake reproduction capabilities, and unprecedented portability. Its modular design allows for future enhancements and integrations with other structural monitoring systems, making it a versatile tool for innovation in civil engineering.