工形钢柱负载下焊接加固的受力特性

目的提出能够考虑负载下焊接过程影响的有限元分析方法．方法通过运用通用有限元软件ANSYS建立有限元模型，对3个不同初负载下焊接加固的工字形钢柱和1个作对比用的未加固钢柱的受力特性进行分析．采用间接热结构耦合的有限元分析方法，考虑焊接热过程和随温度变化的钢材材性．结果计算结果表明，在名义初应力比不超过0．41时，负载下的焊接加固后的钢柱的极限承载能力受初始负载的影响非常小．结论笔者采用的有限元分析方法和有限元模型分析负载下焊接加固工彤钢柱的萤力特性具有较高的可行性．

Analysis on Load-Carrying Behavior of I Section Steel Columns Reinforced by Welding with Initial Compressive Load

In order to put forward a finite element analysis method which can considering the influence of welding process, the finite element analysis were performed using the general software ANSYS for the three reinforced I section columns strengthened by welding under different initial axial compressive load and one unreinforced I section column under axial compression. Two kinds of finite element analysis method used to simulate the carrying load behavior of columns reinforced under load by welding were introduced in detail. The first method is in common use at present, this method only use the technology of element birth and death but without considering welding thermal process. Based on this, the authors had used another method, which is the indirect thermal structure coupling finite element analysis method that considering the welding thermal process. The FEA indicated that the initial axial compressive load has little effect on the ultimate bearing ca- pacity of I section steel columns that reinforced under load by welding when the initial stress ratio less than 0.41. The FEA method and the finite element model the author used had high feasibility of analyzing the mechanical characteristics of steel columns reinforced by weldinz under load.