Experimental Study On Bearing Capacity Of Spatial Steel Frame High-strength Concrete Column

In the process of globalization,both at home and abroad are on the track of rapid development,tall and super-tall buildings are all over the world,to ensure the construction safety and also ensure there is enough space namely the size of the pillars shoulds not be too big,it has higher requirements on the bearing capacity and ductility of the columns.Although the high-strength concrete column improves the bearing capacity of the column,the ductility of the column decreases,and the spatial steel frame constrained high-strength concrete column not only can improve the bearing capacity of the column but also can improve the ductility of the column.There are few reports on the experimental research and mechanism research of high-strength concrete confined by Spatial steel frame.This paper mainly carried out the following researches:Other parameters constant,changing the Angle of limb length,the Strips of the width and spacing design the 7 spstial steel frame high strength concrete short column axial compression test and analysis of test data found spatial steel frame of the core concrete binding effect as the Angle of limb length longer and compose a spacing becomes more significant.Spatial steel frame improves bearing capacity and ductility of high strength concrete axial compression short column.The test data is integrated with the previous theoretical analysis and test data,and the formula is re-fitted by Matlab,and the formula for the concrete strain corresponding to the peak stress and peak stress of the core concrete is given.Through the modeling analysis of nonlinear finite element software ABAQUS to simulate the test of 7 specimens to verify the proposed constitutive model of confined concrete and steel truss modeling method is correct and the proper constitutive model and modeling method,change parameters analysis found that: with the increase of Angle of limb length,compose the width and the decrease of the lacing bar spacingang and thickness of thickened limbs and increased strength of steel,space steel structure high strength concrete axial compression short column improved improve the bearing capacity and ductility of the specimens.The influence factor is considered as a comprehensive influence coefficient,and the larger the influence coefficient is,the greater the bearing capacity is.At the same time considering the decrease of strength of Angle steel by the concretelateral extrusion is constrained by steel truss and concrete strength increase,deduce the spatial steel frame high strength concrete short column under axial load formula of the peak load,after checking found according to the formula to calculate the peak load with the test value difference is very small.