钢筋焊接热对混凝土的影响研究

箍筋焊接加固法为拱上立柱加固的常用方法,但箍筋焊接热可能会对立柱造成损伤.为研究箍筋焊接热可能对立柱造成的损伤,采用ABAQUS软件建立有限元模型,对受焊接热影响的立柱力学性能及破坏规律进行研究.结果表明:箍筋焊接热造成旧立柱局部焊热影响区域混凝土损伤,混凝土弹性模量和抗压强度降低,形成局部薄弱区域；在荷载作用下,薄弱...

Study of Welding Heat Influence on Concrete

The welded stirrup reinforcement method is a method commonly used for reinforcement of columns on arch and as the method is used,the welding heat of the stirrups may cause damage to the columns.To study the possible damage to the columns,the software ABAQUS is used to set up a finite element model and the mechanical behaviour and the law of the damage to the columns influenced by the welding heat are analyzed.The results of the analysis show that the welding heat can cause damage to the concrete of the original columns in the local welding heat influential zone,the elastic modulus and compressive strength of the concrete will decrease and the local weak areas in the concrete will be form.Under the action of load,the weak areas will firstly fail,will not continue working and the effective sections of the columns will reduce.With the expanding of the weak areas,the columns will finally fail.In the design and constriction,the effective measures should be taken to minimize the influence of the welding heat on the mechanical behaviour of the columns.