Structural Dynamic Response Analysis Of Cable Under Transverse Impact Fracture Condition

With the development of social economy,the application scope of cable is more and more wide,and various cable support structures are developing rapidly.The prestressed cable support structure of high-rise steel frame is born.In order to improve the lateral resistance of the structure,enhance the strength of the structure and improve the stability of the structure,the prestress is often applied in the cable,and the prestressed cable is born from this.In recent years,prestressed cable technology has gradually developed and been widely used in various construction projects.The prestressed cable has huge energy in its support structure.If it is subjected to lateral impact of accidental load,it will inevitably lead to partial failure or complete fracture.The strain energy released by the cable in this process will have a huge impact on the whole structure,causing structural vibration and even collapse of the structure.Therefore,it is urgent to study the properties of cable and its influence on the whole structure after it is fractured by transverse impact.When cable is subjected to transverse impact,different impact distance,impact energy and different prestress in cable will affect the failure mode of cable,and different failure modes and stress-strain changes will have different effects on the remaining structure.To fully explore the lasso by accidental loads of shock resistance and fracture after lasso residual structural dynamic response,this paper through experiments to explore the impact performance change after lasso then demonstrated by finite element simulation,and then simulated high-rise frame prestressed cable support structure is broken,the dynamic response of the remaining structure after specific writing content is as follows:Fabrication technology of cable and friction mechanism between strands.The influence of drawing and twisting process on the friction coefficient of steel strand is analyzed,and the influence of friction coefficient on the impact property of cable is explored through cable drawing test.The verification analysis is carried out through finite element simulation.Study on impact resistance of cable.The failure mode and strain distribution of cables subjected to transverse impact were studied through the drop weight test.The effects of impact conditions on the impact performance of cables were studied by setting different impact distance,prestress size and damage types of cables,and general conclusions were drawn.Then the cable impact test simulation,using Solid Works software to draw the same size model with cable and drop hammer,imported into ANSYS software for cable impact test simulation analysis.The same impact conditions as the test were set,including the impact height and the size of the prestress.The failure modes and stress-strain changes of the cable were analyzed in detail.The strain time history curve obtained from the simulation was compared with the data obtained from the test,and a general conclusion was drawn.Simulation of cable breaking response of prestressed cable-braced structure of tall steel frame.SAP2000 software was used to establish a 12-story steel frame model of prestressed cables supported by vertical loads,wind loads and earthquakes.By changing the floor of the broken cables and the prestress in the cables,the influence of the broken cables on the overall structure,including the change of displacement and internal force,was analyzed.The influence of cable break time and damping ratio on the dynamic response of the remaining structure is also investigated.