Device for biaxial dynamic testing of seismic isolators on a reduced scale

Utility Model Patent Application filed with the Superintendency of Industry and Commerce

This device for dynamic testing of seismic isolator prototypes in a real-world environment allows for the application of uniaxial shear, compression, or a combination of both loads. The device enables controlled vertical compression and lateral deformation of the seismic isolator specimens under test. The configuration of the device’s components allows for automated testing, subjecting the specimens to successive cycles of varying or increasing amplitude in both directions until limit states are reached without the need to reposition the specimens between tests. Through the controlled application of forces and deformations via vertical compression and horizontal tension-compression mechanisms, the seismic isolator specimens are loaded and deformed in both directions, generating the actual stress conditions under service conditions as would occur during a real seismic event in a structure.

Construction

The device for biaxial dynamic testing of seismic isolators on a reduced scale addresses a critical need in earthquake engineering: the accurate and cost-effective evaluation of the performance of seismic isolators, which protect structures during earthquakes by isolating them from ground motion. The problem lies in the limitations of existing equipment, which is often expensive, complex, and does not always adequately reproduce the real dynamic and mechanical conditions to which the isolators are subjected. The invention solves this problem by offering a device that allows the simultaneous application of lateral and vertical loads, with precise control of forces and displacements. Its more affordable and versatile design enables dynamic testing that simulates real seismic conditions, optimizing isolator design, validating numerical models, and complying with current technical standards for the certification of these devices.

It offers several advantages and benefits compared to other similar technologies and services: 1. Reduced cost: Unlike other seismic simulators that use complex and expensive hydraulic systems, this device offers a more affordable solution. 2. Simultaneous application of vertical and lateral loads on the isolators: Its ability to combine different types of loads is a significant improvement over traditional uniaxial devices. 3. Advanced control and precision: Through precise control of displacements and applied forces, the reproducibility and reliability of the tests are significantly improved compared to technologies that may experience instability in force or movement control. This is especially relevant compared to simpler pneumatic systems, which tend to be less stable. 4. Biaxial simulation: This device allows for the simulation of seismic movements on two orthogonal axes, while many devices can only perform tests on a single axis. This provides a more realistic simulation of the seismic conditions to which the isolators would be subjected, improving the quality of the assessments.

Marketable Technology/Service: In operation in a real environment, interacting with customers and the market.

University of the Valley

TRL4