负载下焊接加固受弯工形钢梁的受力特性分析

采用通用有限元软件ANSYS建立有限元模型，对3个不同初始负载下焊接加固的受弯工形钢梁和1个做对比用的未加固工形钢梁的受力特性进行有限元分析，并详细介绍了2种用于模拟负载下焊接加固钢梁受力特性的有限元分析方法。基于目前最常用的、仅采用生死单元技术而未考虑焊接热过程的有限元分析方法，采用间接热一结构耦合分析方法，考虑焊接热过程和随温度变化的钢材材性，提出了能够考虑负载下焊接过程影响的有限元分析方法。通过将有限元计算结果与相应的试验结果进行对比，验证了采用的有限元分析方法和有限元模型的可行性。计算结果表明：负载下焊接加固后的钢梁的极限承栽能力受初始负载的影响较大。

Analysis on Load-carrying Behavior of Flexural I-section Steel Beams Strengthened with Welding Under Load

The finite element model were performed using ANSYS, and finite element analysis was carried out for reinforced I-section steel beams strengthened with welding load-carrying behavior of the three under different initial loads and one unreinforced I-section steel beam. Two kinds of finite element analysis methods used to simulate the load-carrying behavior of steel beams strengthened with welding under load were introduced in detail. Based on the method in common use at present, adopting the technology of element birth and death but without considering welding thermal process, the finite element analysis method considering the influence of welding process was put forward, which used the indirect thermal structure coupling analysis method and considered the welding thermal process. The effectiveness of the finite element analysis method and the finite element model were verified by the comparisons between the finite element analysis results and the test results. The calculation results show that the initial load has greatly effect on the ultimate bearing capacity of steel beams strengthened with welding under initial load.