Abstract
This study examines the parameters of Elastomeric Bearing (EB) for affecting the seismic design and behavior for Shurun-Urgun Composite-Steel Bridge is located in Paktia province in eastern part of Afghanistan. Laminated elastomeric bearings used in addition to provide connection between bridge superstructure and substructure, reduce the response of bridge during an earthquake by increasing fundamental period of vibration of bridge, and might reduce the acceleration of superstructure and inertia force passed to the substructure. As an analysis has been done using computer models for two type of piers (tall & short) for similar bridge with or without elastomeric bearing pads and a manually calculation for this numerical investigation to determine the magnitude of forces, displacements and deformations. USGS seismic hazard maps for Afghanistan, and referred to AASHTO, FHWA, and Caltrans manuals where needed.
Highlights
The mountainous heart of Asia-Afghanistan is shaped by tectonically active Alpine-Himalayan orogenic belt that in reflex to the collision between the Indian plate, Arabian plate, and Eurasian plate in Late Paleocene to current period (Ruleman, & others, 2007)
In the table T refers to period of bridge, M is moment at pier bottom, V is shear force at one pier, VK is lateral force at one abutment, dsub is displacement of substructure, dels is displacement of elastomeric bearing
For investigating, the effects of elastomeric bearing on the example Shurun-Urgun Composite Steel Bridge both multi-mode and simplified (SDOF system) analyses have been considered in computer models in cases of considering and ignoring the elastomeric bearings properties
Summary
The mountainous heart of Asia-Afghanistan is shaped by tectonically active Alpine-Himalayan orogenic belt that in reflex to the collision between the Indian plate, Arabian plate, and Eurasian plate in Late Paleocene to current period (fig. 1) (Ruleman, & others, 2007). Seismic isolation bearings used may lower the response of bridge during an earthquake. Isolation bearings should be stiff under service conditions, and flexible under seismic loads This is as isolators transmit service loads to the bridge’s piers without developing harmful overstress with minimum amount of movement, but as a flexible layer between superstructure and substructure protect structure from damaging action of earthquake by partially decoupling with low stiffness and high damping characteristics. Structural analysis is carried out using three-dimensional multi-mode model of bridge and simplified model (SDOF-system: using bridge’s rigidity and mass) considering and ignored the elastomeric bearing pads. The processes repeated on the bridge with taller piers and result from simple analysis (manually calculation) will be compared to find out the impact of elastomeric bearings on seismic response of bridge.
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