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以千米级3塔连跨悬索桥——泰州大桥为工程背景,比较了国内规范对加劲梁竖向挠跨比的相关规定,指出了该规定的实质目的是使行车平稳、安全。通过ANSYS有限元程序对比分析了泰州大桥4种汽车荷载典型工况下的整体位移,结果表明:加劲梁梁端竖向转角与加劲梁竖向挠跨比无本质联系(对于大跨度悬索桥);加劲梁梁端竖向转角与中塔纵向抗弯刚度的相关程度不高,从而明确了多塔悬索桥的2个主要控制指标为加劲梁竖向挠跨比和中塔鞍座抗滑系数。同时,对这两者的限值进行了探讨,并将它们统一到“单跨满布、跨中加力”的工况中计算。
Based on the engineering background of Taizhou Bridge with 3-tower-3-span suspension suspension bridge, the relevant provisions of domestic norms on the vertical span-to-span ratio of stiffened beams are compared. It is pointed out that the essential purpose of this regulation is to make traffic smooth and safe. Through the ANSYS finite element program, the overall displacements under four typical vehicle loads of Taizhou Bridge are compared and analyzed. The results show that there is no essential connection between the vertical angle of stiffening girder and the ratio of vertical bending to span of stiffening girder (for long - span suspension bridge). The correlation between the vertical corner of the girder and the longitudinal bending stiffness of the middle tower is not high, so it is clear that the two main control indexes of the multi-tower suspension bridge are the vertical ratio of the span of the girder and the anti-slide coefficient of the tower. At the same time, the limits of these two were explored, and they were unified into the calculation of working conditions of “single span, full span and cross-border force.”