大跨度懸索橋錨跨索力及散索鞍偏角施工調(diào)整的計算方法
[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.
【作者單位】: 西南交通大學(xué)土木工程學(xué)院;西南科技大學(xué)土木工程學(xué)院;
【基金】:國家自然科學(xué)基金項目(51178396)
【分類號】:U448.25
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