CAJ | 학술논문

已建成的扁平钢箱梁桥在运营过程中发现一些与结构、构造和制造相关的病害，并且随着服役时间的增长越来越突出。其原因是扁平钢箱梁结构采用薄板组焊而成，因此，扁平钢箱梁在未受力之前，便已存在着由于焊接所产生的应力场和变形场，导致扁平钢箱梁普遍出现裂纹等病害。运用热结构耦合法对扁平钢箱梁U肋与桥面板交接处焊接的温度场和应力场进行数值模拟计算分析，并得到焊接残余应力的分布规律，为进一步分析结构病害与加固设计提供依据。
이건성적편평강상량교재운영과정중발현일사여결구、구조화제조상관적병해，병차수착복역시간적증장월래월돌출。기원인시편평강상량결구채용박판조한이성，인차，편평강상량재미수력지전，편이존재착유우한접소산생적응력장화변형장，도치편평강상량보편출현렬문등병해。운용열결구우합법대편평강상량U륵여교면판교접처한접적온도장화응력장진행수치모의계산분석，병득도한접잔여응력적분포규률，위진일보분석결구병해여가고설계제공의거。
The flat steel box girder is commonly used for long‐span cable‐stayed bridges .the structural complexity ,construction details and manufactures cause damage to the bridge and the damages seriously grow overtime .The main reason for these damages is that welding technology of flat steel box girder with thin plates and rib elements produces residual stress and strain fields during the welding process ,and further more welding cracks commonly appear . In this study , thermal‐structural couple methods was adopted to numerically simulate the welding high temperature fields and the stress fields at the joint of U rid and decks of a flat steel box .The welding residual stress distribution was studied as well for further analyzing on the structural damage and strengthening design strategies .