Fire Performance Of Concrete Columns Frame Strengthened With Angle Steel

Angle steel reinforcement technology is a method of reinforcement on the surrounding reinforcing member with angle reinforcement.Sectional dimension of reinforced concrete members changed little through angle steel reinforcement,but capacity is improved significantly.The method can reduce the loss of building headroom as possible to achieve the purpose of strengthening,moreover process is simple,the quantity of site wet operations is less.The technology has been more and more applied in practical reinforcement project in recent years.At present the research of angle reinforcement structure is also more focused on the study of carrying capacity,few involves its performance under fire.Reinforcement studies of RC frame structure becomes necessary as the structure is one of the most widely used in buildings in China.As a result of steel reinforced concrete member after reinforcement under fire hazard is higher than that of ordinary concrete,carrying on angle steel reinforcement becomes particularly important research on fire resistance of reinforced concrete frame.The main contents are as follows:1.Strengthening design of RC frame column with reference to < Reinforced concrete structure design code>,calculating the carrying capacity after strengthening.2.Select suitable material thermal parameters and thermodynamic model,Based on the order of thermal-mechanical coupling,using FEA software ABAQUS to establish the temperature field and mechanics model of RC frame strengthened with angle steel.3.Using reinforced concrete beam,concrete column and RC frame experimental data of fire resistance to verify the Angle steel reinforced concrete frame finite element model.4.Use the validated model to analysis the influence of related factors on fire resistance,including axial compression ratio,load ratio,improve the bearing capacity coefficient,fire location,protective layer thickness.This article research may provide the valuable reference for fireproof design of the reinforced concrete frame strengthened with angle steel...