Abstract
Introduction:An advanced Finite Element model is presented to examine the performance of a low-cost friction based-isolation system in reducing the seismic vulnerability of low-class rural housings. This study, which is mainly numerical, adopts as benchmark an experimental investigation on a single story masonry system eventually isolated at the base and tested on a shaking table in India.Methods:Four friction isolation interfaces, namely, marble-marble, marble-high-density polyethylene, marble-rubber sheet, and marble-geosynthetic were involved. Those interfaces differ for the friction coefficient, which was experimentally obtained through the aforementioned research. The FE model adopted here is based on a macroscopic approach for masonry, which is assumed as an isotropic material exhibiting damage and softening. The Concrete damage plasticity (CDP) model, that is available in standard package of ABAQUS finite element software, is used to determine the non-linear behavior of the house under non-linear dynamic excitation.Results and Conclusion:The results of FE analyses show that the utilization of friction isolation systems could much decrease the acceleration response at roof level, with a very good agreement with the experimental data. It is also found that systems with marble-marble and marble-geosynthetic interfaces reduce the roof acceleration up to 50% comparing to the system without isolation. Another interesting result is that there was little damage appearing in systems with frictional isolation during numerical simulations. Meanwhile, a severe state of damage was clearly visible for the system without isolation.
Highlights
An advanced Finite Element model is presented to examine the performance of a low-cost friction based-isolation system in reducing the seismic vulnerability of low-class rural housings
Sometimes masonry has simple columns to stabilize and stiffen the bricks walls, but it cannot be considered as making part of a resisting frame
The indicators of the performance of friction-base isolation were obtained through finite element (FE) simulations
Summary
An advanced Finite Element model is presented to examine the performance of a low-cost friction based-isolation system in reducing the seismic vulnerability of low-class rural housings. Seismic isolation is an important issue for building designers in order to protect constructions from unexpected damage, in regions exhibiting high risk of earthquake. One of the common types of housing in rural areas uses masonry [1]. Without a moment resisting frame, masonry houses tend to have no sufficient seismic protection to prevent severe damages and even total failure. In many cases of earthquakes in Indonesia, low-class housings experienced severe damage, leading to a strong increase of casualties. To improve the seismic resistance of low-class housings should be an issue of paramount importance for authorities, technicians involved and academics
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