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中文摘要：
以我国首座已建成通车的蝴蝶拱桥为背景，基于乌曼斯基约束扭转的弹性薄壁梁理论及薄壁箱梁的剪力流理论，采用考虑翘曲位移自由度的空间杆系有限元分析模型，结合静载试验实测数据，对该桥单箱多室截面的扁平钢箱弯粱进行了考虑约束扭转效应的空间受力分析．计算结果表明，在蝴蝶拱桥结构中，扁平钢箱弯梁的约束扭转效应比较显著，在设计中应加以考虑．
英文摘要：
Based on the Zhongshan butterfly - shape arch bridge which is the first butterfly arch and had opened to traffic in our country, according to the elastic thin - walled beam theories of Wumnansji and shear flow, adopting the spatial beam finite element mode which including the warping displacement freedom, comparing with the measured data of static loading test, a study about the curved flat steel box girder with the section of single box and several cell of this bridge was conducted with consideration of the effect of restraint torsion. The results indicated that the effect of restraint torsion is remarkable in the steel box girder of the butterfly - shape arch, and it must be considered in design of such bridges.
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