负载下焊接加固过程对钢梁及钢支撑受力性能的影响研究

Study on influence of welding reinforcement on mechanical behavior of steel beam and braces in load status

为研究负载下焊接加固过程对钢梁、钢支撑受力的影响,结合实际工程,利用ANSYS有限元分析软件和焊接加固试验模拟了天津国际贸易中心加固工程中已负载的钢构件的焊接过程,得到了钢梁和钢支撑在焊接过程中应力、位移等的变化规律。研究了加固对构件承载力的提高程度及焊接残余应力对构件承载力的影响;对比有限元分析和试验结果表明:钢梁和钢支撑在负载焊接的过程中,局部高温热影响区引起应力重分布,并使构件产生附加位移;负载焊接引起的应力和位移均较小,且在焊接结束时已经大部分自行恢复,焊接加固过程中结构的安全性可得到保证。

In order to investigate the influence of welding reinforcement process on mechanical behavior of steel beam and braces in load status,the process of welding reinforcement in Tianjin international trade center,was simulated by both the finite element analysis software ANSYS and welding test. The changing rules of stress and displacement of the beam and the bracing during the welding process were derived. The improvement of loading capacity of steel components by reinforcement and influence of welding residual stress on loading capacity was also investigated. Both the analysis and test results show that stress redistribution and additional displacement are caused by the local high temperature and heat affected zone during the process of welding,but the stress and displacement caused by welding are less,which mostly disappear at the end of the welding process. It shows that welding process has little effect on the safety of the structure during the service period and the safety of structure can be ensured.