| Due to the effect of earthquake,the seismic requirements of building structures can not be met by the traditional seismic methods.Energy dissipation and shock absorption technology is a new type of shock absorption technology,which is to increase the structural damping by installing energy dissipaters at specific positions in the structure.Most of the existing dampers need a large displacement to play a good energy consumption effect.A kind of soft steel rod damper is proposed in this paper which can amplify the displacement.The damper can amplify the displacement and also play a good energy consumption effect under the action of small displacement.The soft steel rod of the energy dissipation element is further designed,and the finite element software is used to analyze the damping effect The main contents of this paper are as follows(1)A displacement amplification type of mild steel rod damper is proposed.In view of the fact that good energy consumption can be achieved under the action of small displacement,the displacement amplification type mild steel rod damper is proposed.The shape of Damper Components and global yielding mild steel rod are designed.The advantages,structural characteristics and amplification principle of the displacement amplification type damper are described.(2)Compared with the model without displacement amplification function,the energy dissipation capacity and stress distribution of the model are analyzed.The results show that the energy dissipation effect of the model with displacement amplification function is very obvious,and the energy dissipation capacity is four times that of the model without displacement amplification function.(3)The finite element software ABAQUS is used to establish a numerical model for analysis,and the energy dissipation capacity and the corresponding stress distribution diagram of the displacement amplified mild steel bar damper are studied.The results show that the displacement of the energy dissipation element in the displacement amplified mild steel bar damper is relatively large,and it has a good energy dissipation effect.The results show that the hysteretic curve of the damper is full,which indicates that the damper has good energy dissipation capacity;the stress distribution diagram analysis shows that the stress distribution of the damper is uniform,and there is no damage phenomenon in each component;through the analysis of the hysteretic curve of the damper,the bilinear model can be used to describe its mechanical model.(4)In this paper,the finite element software ABAQUS is used to establish 12 models of displacement amplified mild steel bar damper with different structural parameters to study the influence of different parameters on the energy dissipation characteristics of the damper,and to provide the best structural design reference for the damper.The results show that: with the increase of the diameter of mild steel bars,the energy dissipation capacity is gradually increased;with the increase of the number of mild steel bars,the energy dissipation capacity is gradually increased;with different energy dissipation materials,the energy dissipation capacity is also different,using composite lead bar material,the energy dissipation capacity of the damper is the smallest,using mild steel bar energy dissipation material,the energy dissipation capacity is significantly improved than composite lead bar energy dissipation effect.With the increase of damper magnification,the energy dissipation capacity is gradually increased;... |
