Effect of earthquake energy input characteristics on hysteretic damper efficiency

Abstract

SUMMARYRobust performance of hysteretic dampers, used in controlling mid-rise buildings, against change of earthquake characteristics is investigated in this paper. A shear type ten-storey building incorporating hysteretic dampers is studied as a model under the assumption of elastic perfectly plastic behavior for inelastic frame and damper deformations. An energy-based damper performance index is used to evaluate damper overall e ciency. Thirty-ÿve earthquake records are applied and the damper strength is optimized for each earthquake record to obtain the maximum performance index or the damper e ciency. Based on the obtained numerical results it is found that, besides the e ect of maximum energy input on damper e ciency, other time-dependant properties such as energy-based e ective duration and earthquake dominant period have great in uence on the damper e ciency. A factor ( ), which represents the combined e ect of maximum energy input, e ective duration and dominant earthquake period, is also derived for the prediction of damper e ciency.

Application of genetic algorithm to optimization of buckling restrained braces for seismic upgrading of existing structures

“…Another design approach that employs equivalent viscous damping was proposed by Inoue et al [14]; this depends on the finding that the energy input during an earthquake is relatively independent of the restoring force characteristics of the structural system [15]. Nevertheless, besides the effect of maximum energy input on damper efficiency, several other properties of ground motion have great influence on damper efficiency [16]. Moreover, depending on only the amount of energy as a structural performance criterion might have some disadvantages.…”

Seismic performance assessment of steel frames equipped with a novel passive damper using a new damper performance index

“…Another performance index, named PI, is introduced in as follows: where E D and E H are energy dissipated by dampers and total hysteretic energy, respectively. The PI index is completely based on energy demands but neglects the nonstructural damage and destructive damage to some load‐carrying elements.…”

Analysis and Design of Steel Bridge Structures With Energy Absorption Members

“…To compare seismic demands quantitatively, the ratio of the damper's yield strength to the main structure's lateral yield resistance, referred to as the strength ratio α F , and the ratio of the damper's initial stiffness to the main structure's lateral stiffness, referred to as the stiffness ratio α K , are generally used as design criteria [5,6,7].…”