Eco-rubber Seismic-Isolation Foundation Systems: A Sustainable Solution for the New Zealand Context

Hernandez, Ernesto; Palermo, Alessandro; Granello, Gabriele; Chiaro, Gabriele; Banasiak, Laura

doi:10.1080/10168664.2019.1702487

Cited by 24 publications

(9 citation statements)

References 36 publications

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“…Previous investigations on the cyclic behaviour of structural RuC members have shown the potential benefits in terms of enhanced energy dissipation and damping in comparison to CCM [14][15][16][17], but without providing a full characterisation of the cyclic response. It has also been reported that RuC members can absorb up to 2.5 times the energy, with 1.13 times the viscous damping, of their counterparts of CCM members under cyclic loading [15].…”

Section: Introductionmentioning

confidence: 99%

Cyclic stress–strain rate-dependent response of rubberised concrete

Bompa

Elghazouli

2020

Construction and Building Materials

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This paper presents an experimental investigation into the constitutive response of rubberised concrete materials under monotonic and cyclic compression. After describing the test specimens and experimental arrangement, a detailed account of the stress-strain response of rubberised concrete materials, as well as their reference high strength conventional concrete, is given. The volumetric rubber content is varied between 0 and 40% of both fine and coarse aggregates. Both monotonic and cyclic loading conditions are considered for comparison, and three strain rate levels, simulating static, moderate and severe seismic action, are examined. The increase in rubber content is shown to have a detrimental effect on the stiffness and strength, as expected. However, with the increase in rubber content, rubberised concrete materials are shown to exhibit improved compressive recovery under cyclic loading, coupled with a higher energy accumulation rate, enhanced inter-cycle stability and lower inter-cycle degradation. It is also shown that the increase in strain rate, from static to severe seismic, leads to a notable increase in the stiffness and strength, with these enhancements becoming less significant with the increase in rubber content. Based on the results and observations, expressions for determining the unloading stiffness and residual strain, as a function of rubber content and strain rate, are proposed within the ranges considered. The suggested relationships enable the characterisation of rubberised concrete materials within widely used cyclic constitutive models.

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Section: Introductionmentioning

confidence: 99%

Cyclic stress–strain rate-dependent response of rubberised concrete

Bompa

Elghazouli

2020

Construction and Building Materials

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“…In addition, the damping of the sand/gravel pad increases with increasing shear deformation. 15,17,28 The above-mentioned characteristics form the main isolation mechanism of the sand/gravel pad.…”

Section: Introductionmentioning

confidence: 99%

“…compared the effectiveness of three different isolation systems for seismic protection of existing masonry bell towers. Hernandez et al 15 . proposed the concept of an ecological rubber isolation layer.…”

Section: Introductionmentioning

confidence: 99%

“…In fact, the foundation soil consisting of a sand/gravel pad mainly consumes earthquake energy through friction and collision between gravel particles, which can be referred to as frictional energy and breakage‐dissipation energy, 32 this reduces the shear force transferred to the structure, thereby reducing the seismic demand of the structure design. In addition, the damping of the sand/gravel pad increases with increasing shear deformation 15,17,28 . The above‐mentioned characteristics form the main isolation mechanism of the sand/gravel pad.…”

Section: Introductionmentioning

confidence: 99%

“…Habieb et al 14 compared the effectiveness of three different isolation systems for seismic protection of existing masonry bell towers. Hernandez et al 15 proposed the concept of an ecological rubber isolation layer. Cilsalar and Constantinou 16 proposed a spherical deformable rolling seismic isolator for lightweight residential construction, and a full-size isolator was tested, demonstrating its promising potential.…”

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confidence: 99%

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Hybrid geotechnical and structural seismic isolation: Shake table tests

Yuan

Gan

Guo

et al. 2021

Earthq Engng Struct Dyn

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This paper proposes a hybrid seismic isolation system composed of geotechnical (a layer of sand or gravel as foundation soil) and structural isolation (a low-friction foundation sliding layer), aiming to effectively improve the seismic performance of rural buildings with an economical solution. The isolation system is most suitable for low-rise buildings in high-seismic areas. It is also effective in colder climates as replacing sand or gravel as the foundation soil eliminates frost heave. Shake table testing of three 1/4 scale models of two-story masonry buildings was carried out: an unreinforced brick masonry structure (model MA, without isolation), an identical structure with geotechnical isolation (model MS, with a layer of gravel as the foundation soil), and an identical structure with hybrid geotechnical and structural isolation (model MC). The dynamic characteristics and responses of the three structures were assessed and compared. Test results showed that shear failure of brick walls of model MA occurred at the first story when the input peak ground acceleration reached 0.44g. For model MS, a similar shear failure mode occurred when the acceleration reached 1.02g. Model MC relied on the layer of gravel for isolation before 0.44g, and then several cracks occurred at the foundation sliding layer, which was a sign of sliding. The plastic damage was mainly concentrated in the second story, and model MC showed bending-dominated deformation when the acceleration increased to 1.24g. This study clearly demonstrates the improved seismic performance and technical feasibility of the cost-effective hybrid isolation system.

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