Experimental and numerical studies of shear pin fractures based on linear and bilinear models

摘要

Seismic isolation devices are usually adopted to re-duce structural seismic responses. Because this kind of de-vices have smaller horizontal stiffness and load capacity,and requirements under normal service conditions are notmet. Therefore, shear pins are usually incorporated withseismic isolation devices to resist horizontal load under nor-mal service conditions. In the commonly used isolationbearings, such as friction pendulum bearings, double spher-ical seismic isolation bearings and cable-sliding frictionseismic isolation bearings, shear pins are all installed [1-4].For these bearings, the same seismic design philosophy isadopted. Namely, shear pins are used to restrict the relativedisplacement between the superstructure and the substruc-ture under minor earthquakes and the shear pins will be cutoff and the bridge structure will be changed into a seismicisolation system under major earthquakes.