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以结构部分与整体力学关系为基础,采用“分块法”计算曲线斜拉桥主梁锚固点和主墩支座偏移值,以使内外侧索力及主梁横梁内外侧负弯矩相等。将曲线主梁划分成若干矩形截面曲线梁,通过分块梁与整体梁段的力学关系来建立平衡方程,应用该方法推导了曲线斜拉桥主梁锚固点和主墩支座偏移值的计算公式。用有限元方法分析了2种偏移对龟韭沟大桥受力的影响,并绘制了偏移值对大桥受力的影响曲线,将曲线反应出的合理偏移值与公式计算结果进行了比较。结果表明:偏移主梁锚固点和主墩支座能较好地改善曲线斜拉桥受力,且公式计算结果与有限元分析结果吻合良好。
Based on the relationship between the structural part and the overall mechanics, the displacement of the anchor point and the abutment of the main girder of the curved cable-stayed bridge is calculated by “block method ”, so that the inner and outer side of the cable force and the inner and outer side of the main beam Moments equal. The main girder of the curve is divided into a number of rectangular cross-section curved beams. The equilibrium equation is established by the mechanical relationship between the block girder and the integral beam. The offset value of the anchorage point of main girder and the abutment of the main pier is deduced by this method Calculation formula. The influence of two kinds of offsets on the force of Guizuogou Bridge was analyzed by finite element method. The influence curve of the offset value on the force of the bridge was plotted, and the reasonable offset value reflected by the curve was compared with the formula . The results show that the displacement of anchorage points of main girder and main pier can well improve the stress of the cable-stayed bridge, and the calculated results are in good agreement with the finite element analysis.