Research Of Vibration-mitigation Performance And Application On A Woven Metal Damper

Passive energy dissipation techniques have been rapidly used in the past decades. Those techniques reduce structural responses subjected to wind and earthquake through installing dissipation devices(dampers) in buildings. They are mainly classified into the following groups: metal dampers, friction dampers and viscous dampers. Among them, metal dampers are widely studied and applied for their ease of fabrication and replacement. However, some problems of poor fatigue performance and ease of buckling constrain their developments in the same time. With this promise, a novel woven metal damper is presented in the paper. Several low-strength steel ribbons and high-strength steel rods are cross woven together, resulting into a dissipation device. Its dissipation is derived from the bending deformation of the low-strength steel ribbons. Its dissipation performances are studied through theoretical analysis, numerical simulations and experiments. Main conclusions are as follows:①A model of the low-strength steel ribbon was made in the ANSYS program. Several load-displacement hysteretic curves are obtained by bending forming process and reciprocating motion simulations. Simultaneously the simulation analysis of the contact between the steel ribbons and rods is done.② Subsequently, quasi static tests were carried out and load-displacement hysteretic curve was obtained. The experiment shows that this new woven metal damper has obvious advantage of high fatigue performance.③Instead of using single layer ribbons, each double-layer ribbon including a low-strength steel ribbon and a high-strength spring steel ribbon was conceived in the damper. Through the quasi static test once, it shows that the new scheme could efficiently increase the yielding force and result fuller hysteretic curves.④Based on the numerical simulation and experiments, it is indicated the steel rods of minor diameter induce kneaded shrinkage phenomenon. Fusiform shape rods after parameter optimization are conceived in the damper to improve the dissipation performance. Similar simulations were done which introduce higher energy dissipation capacity, i.e., higher yielding force and fuller hysteretic curves.⑤Using the simplified Bouc-Wen model of eliminating redundancy parameter, the experimental and numerical simulation data were fit into applicable restoring force models.⑥A ten-story plane frame dissipation structure was taken as an example and an elastic-plastic time-history analysis was carried out using program SAP2000. It shows that story drift is reduced obviously after installing the damper into the building.Theory and method of this paper are significant for researching large deformation and contact problems. Research achievements are valuable for engineering applications.