基于边界修正的悬索桥锚跨索股张拉力理论与测试研究

RESEARCH ON TENSION THEORY AND TEST OF ANCHOR SPAN CABLE STRAND OF SUSPENSION BRIDGE BASED ON BOUNDARY CORRECTION

锚跨索股张拉力的精确测量和控制是保证悬索桥主缆线形最为直接有效的手段。基于理想弦振动,对锚跨索股的边界条件进行了简化分析,并对相关弦振动模型进行修正,得到了不同边界条件下的弦振动公式。通过某地锚式悬索桥锚跨索股张拉力的实际测试计算对比分析,结果证明考虑拉杆长度、一端固定另一端弹性支承的边界更为合理,与锚跨索股受力更为接近,为悬索桥主缆设计提供参考。

The accurate measurement and control of the tension of anchor span cable strand is the most direct and effective means to ensure the main cable shape of suspension bridge. Based on the ideal string vibration model, the boundary conditions of anchor span cable strand are simplified. The relevant string vibration model is modified, and the string vibration formulas under different boundary conditions are obtained. We tested the tension force of cable strand at the anchor span of a anchored suspension bridge. After the calculation and comparative analysis, the results show that considering the length of the tie rod, the boundary of one end fixed and the other end elastic support is more reasonable, which is closer to the stress of the anchor span cable strand, providing a reference for the main cable design of the suspension bridge.