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为研究负载下焊接加固钢结构压弯构件的受力性能,采用考虑焊接热影响的有限元分析方法,对不同初始负载、偏心距、长细比及焊接热输入等级等影响因素进行分析。完成了包括未加固压弯钢柱及加固压弯钢柱共72个构件的受力全过程模拟分析,获得了各因素影响规律,并验证了考虑二阶效应的新的名义应力比计算公式。结果表明:未加固构件的初始负载水平可通过二阶式反映;初始几何缺陷模式及大小影响失稳破坏方向及焊接残余变形大小;影响加固构件极限承载力的主要因素依次为偏心距、长细比、焊接热输入、初始应力比;影响焊接残余变形的主要因素依次为焊接热输入、初始应力比、长细比;为新编《钢结构加固设计规范》关于负载下焊接加固压弯构件设计计算方法提供了参考和依据。
In order to study the mechanical properties of welded steel beam-columns (CFST) under load, the influence factors of different initial load, eccentricity, slenderness ratio and welding heat input grade were analyzed by using the finite element analysis method considering the influence of welding heat. The whole process simulation analysis of 72 components including unreinforced steel columns and reinforced steel columns was completed. The influence of various factors was obtained and a new formula of nominal stress ratio was verified. The results show that the initial loading level of un-stiffened members can be reflected in two steps. The initial geometric imperfection modes and sizes affect the direction of destabilization and the size of welding residual deformation. The main factors that affect the ultimate bearing capacity of the stiffened members are eccentricity, Heat input, initial stress ratio; the main factors affecting the welding residual deformation followed by welding heat input, the initial stress ratio, slenderness ratio; for the new “Steel Reinforced Design Code” on the load-welded bending member design Calculation method provides a reference and basis.