Abstract
The characteristics of the seismic bearing change depending on various factors. When an earthquake occurs, the behavior of the bridge may differ from the values expected in the structural design. The shear deformation of the seismic bearing may increase, but it is difficult to reach the fracturede formation. This paper studied the effect of the stiffness due to various dependency and durability on Lead Rubber Bearings (LRB) and the over strength of bridge piers on the bearing behavior when an earthquake occurred. As a result, if the stiffness of LRB reduces within the criteria, seismic performance can be expected safety even if the shear strain designed in the current design is greater than the allowable shear strain. The reason is that the hardening phenomenon in the high strain region of the laminated rubber bearing suppresses the displacement. Also, since the seismic bridges with over strength of the piers have come near elastic behavior when an earthquake occurs, shear strain is easy to be large.
Highlights
The characteristics of the seismic bearing change temperature changes
This paper focuses on bridges with Lead Rubber Bearing (LRB) that increase shear
This paper studied the case where the shear modulus of LRB decreased by 15% as the maximum value and increased by 30% as the minimum value of the expected stiffness in LRB
Summary
The bridge to be reviewed is located on the Type II ground listed in the Reference Design Calculation Examples of Seismic Design for Highway Bridges [14]. This bridge is equipped with distributed rubber bearings (RB). The crosssectional configuration of the pier was set by adjusting only the arrangement of the bar without changing the dimensions of the cross-section of the pier. The maximum shear strain of LRB is designed to 250%, the allowable shear strain. Tab. 4 and 5 show the crosssection configuration of the pier and LRB. Tab. 6 shows the maximum shear strain of LRB and the maximum ductility factor of the pier. Item Usable dimension (bridge axial direction) Usable dimension (bridge perpendicular direction) Monostromatic thickness. Yielding load Shear spring constant (horizontal rigidity) Pressure spring constant (vertical rigidity) Shear stress of lead plug
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