Abstract
Shear pins are commonly used elements integrated with seismic isolation bearings to restrict the relative displacement between the superstructure and the substructure. However, constitutive models for seismic isolation bearings used in seismic isolation designs have not considered the effects of shear pin fractures. In order to establish the constitutive model of seismic isolation bearings with shear pin fractures considered, shear fracture tests of shear pins were conducted, and a linear model and a bilinear model for shear pin fractures were established. By comparing numerical results of different models, the linear constitutive model for shear pins was verified to be accurate enough and suggested to simulate the effects of shear pin fractures in seismic isolation designs. DOI: http://dx.doi.org/10.5755/j01.mech.22.4.16159
Highlights
Seismic isolation devices are usually adopted to reduce structural seismic responses
Shear pins are usually incorporated with seismic isolation devices to resist horizontal load under normal service conditions
Shear pins are used to restrict the relative displacement between the superstructure and the substructure under minor earthquakes and the shear pins will be cut off and the bridge structure will be changed into a seismic isolation system under major earthquakes
Summary
Seismic isolation devices are usually adopted to reduce structural seismic responses. Because this kind of devices have smaller horizontal stiffness and load capacity, and requirements under normal service conditions are not met. In the commonly used isolation bearings, such as friction pendulum bearings, double spherical seismic isolation bearings and cable-sliding friction seismic isolation bearings, shear pins are all installed [1,2,3,4]. For these bearings, the same seismic design philosophy is adopted. Numerical results of seismic responses with the two models were compared at last
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