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为研究钢结构压弯构件在负载下焊接加固过程的热影响以及不同初始负载对焊接加固后受力特性的影响,进行了压弯钢柱的静力试验.被加固钢柱均为工字形双轴对称截面,置于顶端面内自由面外平动约束、底端固接的边界条件下,柱顶固定面内偏心距按四档不同初始负载分别进行.采用翼缘外对称贴焊钢板加固方案,材料类型均为Q345B级普通碳素钢.研究了负载下焊接加固过程构件的位移变化、腹板焊接应力应变重分布、加固后失稳破坏模式及稳定承载力.结果表明:加固焊接次序决定了焊接残余变形及焊接应变重分布的发展机理;初始负载影响焊接残余变形大小;而焊接热输入和初始负载大小共同影响荷载-位移曲线的焊接平台段宽.较小的初始负载几乎不影响承载力,而较大的初始负载明显对承载力不利.此外,初始几何缺陷也影响加固后承载力.
In order to study the thermal influence of the steel-plate bending-bending member under the load during welding reinforcement and the influence of different initial loads on the stress-bearing characteristics of the welded reinforcement, the static tests of the steel columns were carried out. Axial symmetry section, placed in the top surface of the free surface outside translational constraints, the bottom of the fixed boundary conditions, the column fixed surface eccentricity according to four different initial load respectively by external symmetry flange steel flange reinforcement And the types of materials are Q345B ordinary carbon steel.The displacement of the components during welding reinforcement process, the stress redistribution of web welding stress, the failure mode after failure and the stability bearing capacity are studied.The results show that the order of reinforcement welding Which determines the development mechanism of welding residual deformation and welding strain redistribution.The initial load affects the size of welding residual deformation.The welding heat input and the initial load size together affect the welding platform section width of the load-displacement curve.The smaller initial load has little influence Bearing capacity, while the larger initial load is obviously unfavorable to the bearing capacity.In addition, the initial geometric defects also affect the strengthened bearing capacity.