Test study on frequency dependency of shear property of SHDR

The intention of this paper is to study various factors which affect the frequency dependency of horizontal mechanical property of Supper High Damping Rubber Bearing (SHDR) with high shear modulus. The cyclic loading experiment method was adopted to study the effect of shear strain, vertical pressure, temperature, shear modulus of inner rubber of isolator and sequence of loading on the frequency dependency of horizontal mechanical property of SHDR with greater than 0.8 MPa shear modulus. The degree of effect on the equivalent stiffness and equivalent damping ratio of SHDR about them was analyzed, some fitted formulas were given, in which all kinds of factors were considered except temperature. Research results show that the effect of vertical pressure, horizontal strain, shear modulus of inner rubber of bearing and sequence of loading on the frequency dependency of SHDR are small, temperature has a certain degree effect on them. As a whole, the equivalent stiffness of SHDR increases nonlinearly with the increase of frequency of loading, the equivalent damping ratio decreases nonlinearly with the increase of frequency.