Investigation On Columns Strengthened With Longitudinal Prestressing Steel Wire Mesh And Polymer Mortar Under Loading

Bridge structure in the process of daily serving a variety of external load,its structure may produce more or less damage,and with the steady accumulation of damage,the structure of the overall situation will gradually become worse.In addition,some Bridges in order to meet the requirements of the transportation to improve traffic load level,the bridge structure for reinforcement is called for in order to make sure the condition accord with the requirement of safe use.As an important part of bridge pier,its mechanical properties affect the overall safety of the bridge.Therefore,it is very important to improve the bearing capacity of bridge pier by reinforcement.The prestressed steel strand has been widely used in the bending and shear reinforcement of the beam,but this kind of reinforcement method has little research in the reinforcement of bias column.In this paper,using the combination of prestressed steel wire mesh and polymer mortar strengthening methods,namely,the way on the columns strengthened with longitudinal prestressing steel wire mesh and polymer mortar under loading,LPSP reinforcement method for short,and through the numerical simulation and research method of combining components load test research on its reinforcement effect.In order to study the effect and influence factors of the reinforced concrete eccentricity of reinforced concrete with longitudinal prestress tensioning,the reinforcement test of reinforced concrete bias column is carried out.The single side reinforcement method is studied and verified through the loading test of 12 groups of bias column components.Through internal steel bar strain data,concrete strain,strand wire tension,eccentric load data and deformation displacement data to analysis the influence of LPSP reinforcement on the ultimate carrying capacity,deformation bias column stiffness,crack development and failure form factors.And using the ANSYS finite element software,the numerical simulation of the bias column under different eccentricity and reinforcement ways of destruction of the whole process of loading,this paper discusses the way of prestressed steel strand reinforcement,the load eccentricity and steel strand tension value at the beginning of factors on the carrying capacity,stiffness and bias column damage when the influence of the plastic.The results show that the LPSP reinforcement method can effectively improve the ultimate bearing capacity of eccentrically loaded columns,and the reinforcement effect is better with the increasing eccentricity and the total tension of steel strand.The deformation rigidity of eccentrically loaded columns is improved to a large extent after reinforcement,and the ability of the structure to resist deformation is effectively improved.After the reinforcement of eccentrically loaded columns,the cracking load of the structure is significantly increased,which can effectively inhibit the generation and development of tensile cracks and greatly improve the durability of the structure.LPSP reinforcement can effectively change the failure form of eccentrically loaded columns.The LPSP reinforcement method can effectively improve the ultimate bearing capacity and flexural rigidity of eccentrically loaded columns,the plastic development of component sections is more sufficient,and the deformation characteristics of ductile failure are more obvious.Moreover,when the eccentricity distance is large,the strengthening effect of single side prestressed tensegrity is more significant.