Comparing Rubber Bearings and Eradi-Quake System for Seismic Isolation of Bridges

Abstract

Seismic isolation systems have been used worldwide in bridge structures to reduce vibration and avoid collapse. The seismic isolator, damper, and Shock Transmission Unit (SUT) are generally adopted in the seismic design of bridges to improve their seismic safety with economic efficiency. There are several seismic isolation systems, such as Natural Rubber Bearing (NRB), Lead Rubber Bearing (LRB), and the Eradi-Quake System (EQS). EQS as a new technology is expected to effectively reduce both seismic force and displacement, but there is still some need to verify whether it might provide an economical and practical strategy for a bridge isolation system. Moreover, it is important to guarantee consistent performance of the isolators by quality control. A comparative evaluation of the basic properties of the available seismic isolators is thus necessary to achieve a balance between cost-effectiveness and the desired performance of the bridge subjected to extreme loading. Accordingly, in this study, the seismic response characteristics of the seismic isolation systems for bridges were investigated by conducting compressive test and compressive-shear test on NRB, LRB, and EQS.

Seismic Behavior of Micropiles and Micropiled Structures Used for Increasing Resilience: A Literature Review

“…We further expand the discussion into the field of damping and seismic dampers, as damping in any structure is a combination of intrinsic, aerodynamic, hysteretic, and supplementary damping. Supplementary damping can be obtained by adding damping devices; these devices can help enhance the seismic response by increasing the damping value, decoupling the superstructure from the seismic motion, or combination of both ways [8,[22][23][24].…”

The effects of the duration, intensity and magnitude of far-fault earthquakes in seismic retrofitting an RC bridge

“…One of the most effective solutions for bridges' seismic retro t is using energy dissipation equipment. Extensive studies suggest that energy dissipation devices lead to bridges' seismic retro t [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”

“…One of the most effective solutions for bridges' seismic retro t is using energy dissipation equipment. Extensive studies suggest that energy dissipation devices lead to bridges' seismic retro t [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].Studies showed that earthquakes are divided into two groups of near and far fault earthquakes according to the distance of the earthquake recording station from the fault. Each group of earthquakes has speci c characteristics [18][19].…”

Regularity Maintenance Properties under Deformation of Kink-Introduced Nano-Mille-Feuille Structures Derived from Interfacial Friction

“…Seismic isolation rubber, a construction material, which is made by repeatedly stacking steel plates and rubber, suppresses the effect of vibration energy from an earthquake being transmitted directly to a building. 8 The repeating structure of hard and soft materials provides a clue for developing materials with enhanced mechanical properties. In the recent decades, the development of high-strength materials referred to as long-period stacking ordered (LPSO) structures 9,10 has attracted attention in the field of metallic materials such as Mg alloys.…”

“…It is a natural organic/inorganic composite material with strong and elastic properties; however, human beings have long used similar materials as macroscopic structural materials. Seismic isolation rubber, a construction material, which is made by repeatedly stacking steel plates and rubber, suppresses the effect of vibration energy from an earthquake being transmitted directly to a building . The repeating structure of hard and soft materials provides a clue for developing materials with enhanced mechanical properties.…”