| Earthquakes are destructive and unpredictable natural disasters.Sudden strong earthquakes can not only cause great damage to buildings and structures,but also cause serious casualties and property losses.Energy dissipation technology occupies a large proportion in the seismic control technology of Engineering structures.In the energy dissipation technology,hysteretic dampers in metal damper is a kind of effective damping device.It has the advantages of significant energy consumption,high durability,clear energy dissipation mechanism and simple and economic advantages.Mild steel damper dissipative element according to its geometry can be divided into energy dissipation plate element and bar element.The study of the traditional focus on plate type energy dissipation components,and for the study of steel bar type energy dissipating element is relatively small.In this project,a new type of steel rod energy absorber is proposed based on the existing research results and the further research work on the energy dissipation of steel bars.And has carried on the detailed study,also studied in the framework of reinforcement design and installation in the framework of the damping effect,the article made the following work:(1)An array damper based on rod steel energy dissipation element is proposed.First of all,the design of 2 kinds of steel rod Q235 dampers,pseudo static simulation of the 2 types of steel bar body dissipative element by using the finite element software ABAQUS,and compared the results with 3 different forms of literature and the mild steel Q235 rod dampers,final get the Q235 rod dissipative element of a mild steel energy dissipation properties of the optimal form from 5.The finite element analysis of the rod energy dissipation unit made of 3 kinds of low yield point steel LYP100,LYP160 and LYP225 produced by Anshan Iron and steel company is carried out under the optimal section parameter combination,and the energy dissipation performance is compared and analyzed.The results show that:The yield strength of steel has certain influence on the energy dissipation performance of rod energy dissipation element,the energy performance of low yield point steel bars than mild steel energy unit energy consumption performance is good,the best performance of the LYP160 energy unit energy consumption.(2)By using literature array type steel bar body damper characteristics and energy dissipation components have been obtained the optimal energy dissipation,The equivalent linearization method and the simplified reinforcement method are used to design the seismic strengthening of the frame structure with dampers.Different effects of different location parameters,and the number of body damper in the framework of the array type steel bar produced by the effect of reinforcement and two design methods.The results show that:The equivalent linearization method is designed to be biased economy.Get the position of the damper in the structure,the minimum number and the minimum parameter.The simplified design method of engineering is partial to safety.The setting and quantity of the damper are determined,and the parameters of the damper are set in the structure,and the larger damping ratio is added to the structure.(3)In order to study the use of array type mild steel rod damper reinforcement structure seismic effect,numerical simulation using finite element software SAP2000,select El Centro seismic wave taft wave and lanzhou wawe,the elastoplastic time history analysis of frame structures with an array of low yield point steel bar dampers and the ordinary frame structures without dampers are carried out under rare earthquakes,and the results were compared and analyzed.The results show that:steel damper installed in the building structure,the structure can significantly reduce the maximum drift angle,significant reduction of structure vertex displacement and vertex acceleration and after reinforcing the basic structure intact,proved that the array of low yield point steel rod damper has a good damping effect. |
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