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为了改进传统斜拉桥主梁的受力性能,提出具有张弦梁特征的新型索梁锚固形式。推导分析了新型索梁锚固的传力机理,采用有限元软件ANSYS计算了系列单索模型。腹杆布置、张弦垂跨比对主梁的受力影响较大;最长腹杆宜靠近拉索转向点、张弦垂跨比在条件允许时宜取较大值。对于远、近端锚固形式,随着斜拉索角度的增加,拉索转向点处索梁作用力分别增大和减小、而且此作用力总是远端形式小于近端形式。该文的索梁锚固新形式保持了传统斜拉桥拉索对主梁的竖向弹性支撑作用,可降低拉索锚固力,而且主梁的受力状况由于腹杆的显著支撑作用而改善。
In order to improve the mechanical properties of the main girder of the traditional cable-stayed bridge, a new type of cable girder anchorage with the characteristics of a beam string is proposed. The force transmission mechanism of the new cable girder anchorage is deduced and analyzed, and the series single cable model is calculated by finite element software ANSYS. The arrangement of the webs and strut are more influential than the stress of the main girder; the longest bar should be close to the turning point of the cables, and the strut-cross ratio should be larger when the condition allows. For the far and near-end anchorage forms, as the angle of stay cables increases, the force acting on the girder increases and decreases respectively at the turning point of the cables, and this force is always smaller in the distal form than in the proximal form. The new form of cable beam anchorage maintains the vertical elastic support of traditional cable-stayed bridge to the main girder, reduces the anchorage force of the cable, and the stress condition of the main girder is improved due to the significant support effect of the web.