Abstract
Thermal effect and preload are significant factors affecting the mechanical properties of strengthened members in engineering structures. This study concerns the welding thermal effect and mechanical properties of circular steel tubes strengthened by welding angle steel under the preloading condition. The mechanical properties of circular steel tubes strengthened by welding angle steel under the preloading condition were studied with the axial compression tests. The indirect thermal-structural coupling method was proposed and verified by finite element analysis, further compared with the tests. At last, a series of parametric studies were conducted to investigate the influence of loaded strengthening on mechanical properties of circular steel tubes strengthened by welding angle steel under the preloading condition. The corresponding permissible stress ratio and calculation method for the ultimate earing capacity and the axial thermal deformation were proposed. The results provide a basis for the strengthening design of the circular steel tube under the preloading condition.
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