Optimal frictional coefficient of structural isolation system

Chung, Lap-Loi; Kao, Pei-Shiou; Yang, Cheng-Ta; Wu, Lai‐Yun; Chen, Hung-Ming

doi:10.1177/1077546313487938

Cited by 33 publications

(13 citation statements)

References 22 publications

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“… for low isolation period and for higher pier periods because of the resonance effects which mainly affect the effective frequency of the frictional bearings and the dominant frequency of the corresponding random excitations. As observed in similar studies [13], [23], [78]- [81], the existence of an optimal value of the friction coefficient derives from a combination of different effects. Indeed, an increase of the sliding friction coefficient leads to higher isolator strengths (and thus higher values of the equivalent stiffness, with a lowering of the corresponding effective fundamental vibration period (Fig.1)) and higher forces towards the deck.…”

Section: Parametric Study Results For Each Soil Conditionsupporting

confidence: 54%

Optimal Sliding Friction Coefficient for Isolated Bridges in Different Soil Conditions

Castaldo¹,

Ripani²,

Priore³

2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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The work evaluates the optimal properties of friction pendulum system (FPS) bearings for the seismic protection of bridge piers under earthquake excitations having different frequency characteristics representative of different soil conditions in order to reduce the seismic vulnerability of infrastructures. A two-degree-of-freedom model is adopted to describe, respectively, the response of the infinitely rigid deck isolated by the FPS devices and the elastic behavior of the pier. By means of a non-dimensional formulation of the motion equations, a wide parametric analysis for several structural parameters is carried out. Seismic excitations, modelled as time-modulated filtered Gaussian white noise random processes having different intensities and frequency contents, are considered. Specifically, the filter parameters, which control the frequency contents, are properly calibrated to reproduce stiff, medium and soft soil conditions, respectively. Finally, the optimum values of the sliding friction coefficient able to minimize the pier displacements with respect to the ground are derived as a function of the structural properties, of the seismic input intensity and of the soil condition.

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Section: Parametric Study Results For Each Soil Conditionsupporting

confidence: 54%

Optimal Sliding Friction Coefficient for Isolated Bridges in Different Soil Conditions

Castaldo¹,

Ripani²,

Priore³

2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…It is protected by a patent that has been filed at the Slovenian Intellectual Property Office (SIPO). The principle of the solution is analogous to that of sliding seismic base isolation systems [39][40][41][42][43][44][45][46][47].…”

Section: Description Of the Proposed Foundation Systemmentioning

confidence: 99%

Seismic Aspects of the Application of Thermal Insulation Boards Beneath the Foundations of Buildings

Koren¹,

Kilar²,

Azinović³

2016

Insulation Materials in Context of Sustainability

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In recent years, there has been a significant increase in the construction of energyefficient buildings. These buildings are mainly characterized by their thermal envelope, which needs to follow the complete outer perimeter of the building without any interruptions, to avoid thermal bridges. It has been observed, however, that the specific new details which prevent the occurrence of thermal bridges can, in many cases, substantially affect the structural integrity of such buildings during earthquakes. This chapter deals with the seismic aspects of the application of thermal insulation (TI) boards beneath the foundations of buildings. For this purpose, the mechanical characteristics of the most commonly used material in practice (i.e., extruded polystyrene-XPS) were experimentally determined. Additionally, the shear behaviour of differently composed TI foundation sets was investigated and their friction capacity estimated. The authors have proposed a new solution for the foundation detail, which is based on controlling the sliding mechanism between the individual layers of TI boards in order to reduce the seismic forces induced on the superstructure. The proposed detail with a specially designed sliding layer surface is made of commonly used TI materials for modern passive houses, thus reducing the potential additional costs. The solution was verified by means of nonlinear dynamic analysis of several realistic building models and various friction coefficients between XPS boards. The selected results are presented in terms of fragility curves for the occurrence of sliding between the layers of XPS boards. Based on these curves, the desired seismic response scenario and level of protection of a building structure could be selected.

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“…ISBN: 978-1-63248-088-0 doi: 10.15224/ 978-1-63248-088-0-24 branch, so that the seismic forces acting on the structure might be reduced. Only in this case will the TI layer act as a traditional seismic base isolation system [8][9][10][11][12][13][14], so that the earthquake induced forces would be reduced.…”

Section: Foundation On Thermal Insulation Layersmentioning

confidence: 99%

“…The proposed solution is protected by a patent that has been filed at the Slovenian Intellectual Property Office (SIPO). The principle of the solution is analogous to that of sliding seismic base isolation systems [8][9][10][11][12][13].…”

Section: A Research and The Proposed Foundation Detailmentioning

confidence: 99%

Impact of Energy Efficient Construction Details on Seismic Resistance of Passive Buildings

Azinović¹,

Koren²,

Kilar³

2016

Fifth International Conference on Advances in Civil and Structural Engineering - CSE 2016

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Recently, an increasing trend of passive and lowenergy buildings transferring from non-earthquake prone to earthquake-prone regions has thrown out the question about the seismic safety of such buildings. The paper describes two most commonly used structural details of energy efficient construction, which could be critical from the point of view of earthquake resistance: i) Foundation of a building on thermal insulation (TI) layers and ii) Fixing of precast balcony element without thermal bridge. The first part of the paper describes the problematics of founding of a building on TI and presents the authors' proposal of seismic fuse assembled out of TI boards and waterproofing (foil) layers, which have been commonly used under the RC foundation slabs of passive buildings. The main idea is to reduce the seismic forces on the superstructure by allowing controlled lateral sliding between the individual layers of the TI boards. The feasibility of the proposed solution has been analysed by means of nonlinear dynamic analyses for selected 2-and 4-storeyed passive buildings founded on TI boards made of extruded polystyrene (XPS). The second part of the paper analyses the seismic response of precast balcony cantilever structural elements, which have been recently developed in seismic non-prone areas in order to prevent the thermal bridge at the point where the cantilever is fixed to the building. Such balcony elements have been made primarily to withstand vertical static loading neglecting the eventual vertical seismic loads in the case of an earthquake. It has been found out that those cantilevers in the case of uplift might not be designed with adequate safety, since they lack sufficient reinforcement on the bottom side. In order to reduce their seismic vulnerability some changes of precast load-bearing TI elements have been proposed.

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Optimal frictional coefficient of structural isolation system

Cited by 33 publications

References 22 publications

Optimal Sliding Friction Coefficient for Isolated Bridges in Different Soil Conditions

Optimal Sliding Friction Coefficient for Isolated Bridges in Different Soil Conditions

Seismic Aspects of the Application of Thermal Insulation Boards Beneath the Foundations of Buildings

Impact of Energy Efficient Construction Details on Seismic Resistance of Passive Buildings

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