无背索斜拉桥成桥索力优化研究.pdfVIP

摘 要 斜塔无背索斜拉桥具有优美的外形，是一种新颖独特的桥梁结构形式，利用塔柱 倾斜来平衡桥梁恒活载，无背索丰富了桥梁结构与景观之间的协调关系。由于斜塔无 背索斜拉桥结构的不对称性和具有无背索的特点，后期成桥索力调整对桥梁结构内力 和线形的最终状态达到设计要求具有关键作用。 本文研究主要内容： 1、本文通过对国内外现有的无背索斜拉桥分析，给出了无背索斜拉桥成桥索力优 化方法及各方法的优缺点，着重介绍了索力优化状态的确定及本桥所采用的成桥索力 优化方法。 2 、无背索斜拉桥成桥优化计算方法是依托延安市子长县康复秀延河大桥建立 MIDAS 有限元模型，通过对成桥索力优化方法比较分析，采用未知荷载系数法与影响 矩阵法进行成桥索力优化，选取合适的成桥优化控制目标、优化约束条件从而进行索 力求解。所采用的成桥索力优化方法对同类桥型的索力优化具有指导意义。 3、无背索斜拉桥成桥优化施工控制阶段，利用成桥优化计算索力的方法能够求出 一组索力优化值，但是桥梁施工过程中未能采取严格的施工控制措施尤其是索力张拉 锚固不到位，成桥后桥梁仍不能达到成桥最优状态。本桥施工采用自适应控制理论进 行严格的施工控制，着重分析了索力张拉锚固时的注意事项，为确保索力张拉的准确 性采用压力传感器与锚索计双重控制，最后通过分析塔梁变形值，验证成桥优化合理 性。 关键词：无背索斜拉桥，成桥索力优化，未知荷载系数法，影响矩阵法，锚索计 Abstract Leaning Tower cable-stayed bridge without backstays, is a kind of novel and unique bridge structure along with beautiful shape.The use of pillar tilt is to balance the dead load and live load . Because Leaning Tower cable-stayed bridge without backstays has the point of no back stayed cable and asymmetry , later bridge structures have an adjustment to cable force internal force and the final state of the linear to meet the design requirements. In this paper, the main contents as follows: 1 this article through the domestic and foreign existing no back stayed cable bridge analysis and study ,introduces a various of cable force adjustment method at finished stage, as well as its advantages and disadvantages. It is mostly about how to judge critical optimization state and select the appropriate cable tension optimization 2 At finished bridge optimization calculation stage ，ZiChang bridge is analyzed by using the finite element model of MIDAS .By comparing the various cable force optimization methods ,The paper uses the unknown load coefficient method and influence matrix method for the optimization of cable force by Se