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Base isolation systems have become a significant element of a structural system to enhance reliability during an earthquake. One type of base isolation system is Friction Pendulum Bearing in which the superstructure is isolated from the foundation using specially designed concave surface and bearing to allow sway under its own natural period during...
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Context 1
... response of the aforementioned system has been subjected to two strong earthquakes are studied. El Centro earthquake has 500 increment and 0.02 time step and Loma Prieta earthquake has 2000 increment and 0.02 time step (Table 2) The numerical analysis show that the input energy from earthquakes (El Centro & Loma Prieta) and efficiency the FPS on dissipation of the vibration energy to keep the structure from failure fig. 14 & 15. ...
Context 2
... response of the aforementioned system has been subjected to two strong earthquakes are studied. El Centro earthquake has 500 increment and 0.02 time step and Loma Prieta earthquake has 2000 increment and 0.02 time step (Table 2) The numerical analysis show that the input energy from earthquakes (El Centro & Loma Prieta) and efficiency the FPS on dissipation of the vibration energy to keep the structure from failure fig. 14 & 15. ...
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Citations
... Bentuk pelat baja yang cekung menyebabkan struktur bergerak layaknya pendulum saat gempa terjadi, sehingga setelah gempa berhenti struktur akan berosilasi dengan amplitudo yang terus mengecil hingga akhirnya kembali keposisi semula [7]. Pergerakan tersebut akan meningkatkan periode struktur dan displacement, sehingga mekanisme disipasi gempa bisa terjadi. ...
p>Conventional design for bridges in seismic-prone areas relies on ductility concept by concentrating the damage at columns’ ends. This approach is adequate for life safety; however, bridge columns exhibit significant damage and residual deformations resulting in expensive repairs or need for full replacement. Several seismic protective systems were developed over the last few decades to minimize the damage and enable repair after strong earthquakes like rocking systems, dampers, and seismic isolation systems. This paper proposes an innovative system that integrates several seismic protective concepts to achieve self-repair and deconstruction through additive construction. In this proposed system, protected elements such as bridge bent caps, columns and footings are additively constructed. In addition, the columns are designed to rock at interfaces between the columns and bent cap/footing and external elements are added to dissipate energy to promote resiliency.</p
Friction pendulum base isolation system (FPS) is currently a widely used practice for the protection of structural and non-structural components of buildings against the destructive effects of earthquakes, due to its significant features such as the steadiness of its physical properties and its durability compared to other base isolation devices such as elastomeric bearings. This paper is focused on an examination of the dynamic response of metallic building fitted with a friction pendulum base isolation damper. The analyses were elaborated with a three-dimensional (3D) numerical modelling. Fast nonlinear time history analysis (FNA) with ten seismic signals is applied in this work employing a structural analysis programme. The results obtained from the investigations of different cases studied with and without the isolated bearing base were summarized in tables and graphics and discussed. In addition, the hysteretic behaviour of the FPS device was examined and discussed under a major seismic event. Furthermore, to explore the performance and subsequently the level of damages that can occur in the steel frame elements in the case of its three alternatives (braced, unbraced and isolated), nonlinear static analyses (pushover procedure) were carried out and the results analysed. The paper showed the significant ability of the FPS damper to dissipate the response of the steel frame under extreme conditions considering various types of earthquake recordings and different levels of dynamic loadings, without resorting to the need to reinforce with additional steel members.
