大跨度悬索桥锚跨索力及散索鞍偏角施工调整的计算方法

发布时间：2019-01-26 22:00

【摘要】：为安全快速地实现大跨度悬索桥锚跨索力及散索鞍偏角的施工调整,针对空缆状态下锚跨索力与散索鞍偏角相互耦合的结构特殊属性,研究了锚跨索力及散索鞍偏角施工调整的计算方法。基于小变形假设,并结合大跨度悬索桥的结构特性,计算出散索鞍IP点沿其支承滑移面的平动刚度,根据散索鞍IP点处的力平衡条件,推导出锚跨索影响矩阵,继而将锚跨索力及散索鞍偏角施工调整的目标函数用锚跨索弹性伸长量和散索鞍偏角的形式表示;借助数值仿真软件,基于迭代求解的方式建立了大跨度悬索桥锚跨索力及散索鞍偏角施工调整的计算方法,并根据数值模拟结果提出了锚跨索施工调整顺序及调整量的优化方法。研究结果表明:由锚跨索影响矩阵计算所得的调整后索力同实测值保持一致;按照优化后的理想锚跨索调整方案计算得到的最终索力理论误差在0.1kN以内且调整过程未出现索力过大或者过小的情况;该计算方法理论上能够安全快速地实现锚跨索力及散索鞍偏角的施工调整,且可满足锚跨索的抗滑移要求,具有一定的工程应用价值。
[Abstract]:In order to realize the construction adjustment of anchor span cable force and saddle deflection angle of long-span suspension bridge safely and quickly, the special structure properties of coupling between anchor span cable force and saddle angle under the condition of empty cable are discussed. The calculation method of construction adjustment of anchor span cable force and saddle deflection angle is studied. Based on the assumption of small deformation and the structural characteristics of the long-span suspension bridge, the translational stiffness of the IP point of the loose cable saddle along its slip surface is calculated. According to the force balance condition at the IP point of the saddle, the influence matrix of the anchor span is derived. Then the objective function of the construction adjustment of anchor span cable force and saddle angle is expressed in the form of elastic elongation of anchor span cable and angle of saddle deflection. With the help of numerical simulation software, the calculation method for the adjustment of anchor span cable force and saddle deflection angle of long span suspension bridge is established based on iterative solution. According to the results of numerical simulation, the adjustment sequence and adjustment quantity of anchor span cable construction are put forward. The results show that the adjusted cable force calculated by the anchor span influence matrix is consistent with the measured value. The theoretical error of the final cable force calculated according to the optimized ideal anchor span adjustment scheme is within 0.1kN and there is no excessive or too small cable force in the adjustment process. The calculation method can safely and quickly adjust the anchor span cable force and saddle deflection angle in theory, and can meet the anti-slip requirement of anchor span cable, so it has certain engineering application value.
【作者单位】：西南交通大学土木工程学院;西南科技大学土木工程学院;
【基金】：国家自然科学基金项目(51178396)
【分类号】：U448.25

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