Research on mechanical behavior of hexagonal CFT stub column under axial compression
Based on the existing concrete triaxial plasticity-damage constitutive model and steel elastic-plasticity constitutive model,a three-dimensional solid fine finite element model of a hexagonal steel stub concrete axial compression column is established,and the finite element results of damage patterns,load-displacement curves and ultimate load carrying capacity are compared with the test results.On the basis of existing experimental verification,parameter analysis was conducted to compare the effects of steel tube strength,concrete strength and thickness of steel tube on the load-displacement curves.The areas of restrained and unrestrained zones and their corresponding average values of concrete Mises stresses when the hexagonal column reaches the ultimate load carrying capacity are determined,and a practical formula for calculating the load carrying capacity taking into account the restraining coefficient is proposed.Comparison of the ul-timate bearing capacity obtained from this formula with the test and finite element values proves the accuracy and validity of the formula,which is superior to the formula suggested by other scholars and codes.
万方数据
维普
