Optimized friction pendulum and precast-prestressed pile to base-isolate a Chilean masonry house

Abstract

In this study friction pendulum system (FPS) bearings and precast-prestressed pile (PPP) isolators are considered as base isolation devices for a Chilean confined masonry house. The house is numerically modeled using a multiple degree-of-freedom approach that is calibrated with experimental data. Dynamic behavior of the FPS and PPP isolators is simulated using analytical formulations based on laboratory testing. Optimization of the isolators is performed using an earthquake that is generated to match the design spectrum for the house based on Chilean seismic code. A non-dominated sorting genetic algorithm (NSGA-II) is applied to carry out the optimization. Seismic response of the base-isolated structure subjected to a suite of ground motions is compared to the performance of the traditionallyconstructed structure by means of several performance indices (PIs). Numerical simulations indicate that the PPP isolation system is more effective in reducing the base and structural shear, interstory drift, and floor acceleration of the structure than the FPS isolation system, although both systems result in substantial reductions of the response.

Inherent Adaptive Structures Using Nature-Inspired Compound Elements

“…The compound column element is inspired by the human spine. It is a type of kinematic isolator, which was first proposed by Calafell et al (2010). The compound column element is a self-centering system that comprises 4 main parts (see Figure 2): a vertical rod with rolling surfaces at both ends (similar to a lumbar vertebra), top and bottom capitals (similar to a half lumbar vertebra), circumferential cables (similar to vertebral ligaments and muscles), and top and bottom interface rubber-like material (similar to an intervertebral disc).…”

Sustainable Earthquake Resilience with the Versatile Shape Memory Alloy (SMA)-Based Superelasticity-Assisted Slider

“…FPS has become a well-known practical IS due to its technical advantages. There are, however, some limitations with FPS and its variants [33,34]. SMA-based recentering is a relatively modern alternative solution for the restoring problem of sliding ISs [35][36][37][38][39][40][41].…”