Study On Bearing Capacity Of Axially Compressed Steel Columns Under Prestressed Restraint

Over the past few years,steel structure,with light weight and high quality,convenient construction,has made a rapid development.At present,many structural engineers apply pre-stressed loads in steel structure to improve the performance of steel structure and reduce the deformation of steel structure under load,which improves the utilization of steel to agreat extent.Prestressing force column is one of them.Under the action of horizontal bracing and prestressing force cable,the stability of structural member is improved to a great degree,so it has been widely used in steel structure.Prestressing force column is a kind of compression column which uses horizontal bracing and prestressing force cables to impose lateral constraints on horizontal bracing around the core column,so as to reduce the calculation length of the column and improve the axial stability of prestressing force column,prestressing force technology is used to improve the bearing capacity of the column.Based on the research of related prestressing force column,this paper improves the horizontal bracing form of prestressing forcecolumn and the direction of prestressing force cable and puts forward the double-steering prestressing force brace pillar.The modified prestressing force column proposed in this paper changes the traditional analytical method of bearing column without considering the endfactor.The double steering prestressing force brace column not only takes into account the middle bending deformation but also makes use of the end constraint,which greatly improve the bearing capacity of the bearing column and further enhance the economy of prestressing force column.This article mainly studies the following contents:(1)First of all,this paper introduces the general prestressing force column-free and prestressing force column-free instability forms,and then briefly discusses the stability theory and stability calculation method of prestressing force column,and proves the correctness of the optimization besed on the equivalent spring stiffness formula of prestressing force strut.(2)This paper analyzes the numerical simulation of the non-prestressing force column,single transverse prestressing insulation forcecolumn,three transverse prestressing insulation forcecolumn and double steering prestressing force support of the plate column,for example,the working principle and classification method of element selection and,prestressing forcecolumn applied by boundary condition,prestressing force in the process of finite element modeling are discussed in this paper.The numerical simulation results show that the addition of the steering plate improves the stability and stiffness of the core steel columns.The results show that the characteristic buckling loads of double steering prestressing force columns are 2.43 times of those of prestressing force columns and 2.17 times of nonlinear buckling loads.(3)Finally,considering the,horizontal bracing height distribution of horizontal bracing length and the variation of bearing capacity of prestressingforce steel bar under different variables,this paper compares and analyzes the double steering prestressing force brace pillar and found out the best parameters.