【作者】 杜蓬娟；

【导师】 张哲；

【作者基本信息】 大连理工大学 ， 桥梁与隧道工程， 2003， 博士

【摘要】 随着高强度材料的使用，结构分析方法的进步，以及施工手段的改善，斜拉桥在20世纪90年代得到快速发展。随着跨度的不断增大、结构形式的多样化，斜拉桥不但在大跨度领域开始与悬索桥展开竞争，而且在中小跨径也开始与其它桥型展开竞争。跨度的不断增大及桥型的多样化，给斜拉桥的施工控制工作带来了许多新的课题。本文主要针对斜拉桥施工控制中的几个关键问题进行研究，主要内容和结论如下： 1．针对斜拉桥施工控制中的多目标、多约束的优化问题，采用满足化评价法和综合参数法联合求解。该方法的特点是通过凝聚函数，同时对多个目标和多个约束进行凝聚，将多目标、多约束的的优化问题转化为单目标、单约束的优化问题，然后利用Lagrange乘子法将单目标、单约束的优化问题转化为无条件极值问题进行求解．满足化评价法和综合参数法的引入对于实际工程中出现的多目标、多约束优化问题有重要的参考价值。 2．斜拉桥合理成桥状态的确定方法有多种，但在索力调整中，都采用试算的办法。本文采用不变形预张力的概念，将索力的设计归结为不变形预张力的确定，控制目标直接选为多个节点的位移和控制截面的内力，使成桥后的这些控制目标值达到和接近设计者的期望水平，并且施加预应力时，不切断索，比较符合施工过程中张拉时的实际情况。 3．本文以影响结构为基础，通过拉索张拉过程的结构分析，建立了张拉过程的最优控制数学模型。该方法能够在满足所有中间状态张拉工具的承载能力、内力和位移约束条件下，达到预先给定的设计状态，解决了缆索承重结构施工控制中的一个困难问题。 4．对斜拉桥成桥后的误差调整问题建立了误差调整的多目标多约束的优化模型，采用满足化评价法和综合参数法进行求解，通过算例，验证编制程序的正确性和该方法的可实现性。实际上该模型不但适合斜拉桥成桥后的误差调整，而且能够应用于悬索桥、拱桥的施工控制中，对同类问题有重要的参考价值。 5．斜拉桥一般都利用挂篮采用悬臂法施工或采用满堂支架法施工，而公和斜拉桥首次将滑动模架法应用于斜拉桥的主梁施工中。该新方法的采用，给施工控制带来了许多新的课题。本文针对该施工方法，提出了在混凝土浇注前采用“单支撑、单吊挂”系统，混凝土浇注后采用“双支撑、单吊挂”系统方案，该方案很好的解决了施工中的安全问题。并根据该施工方法的特点，建立了一套可行的施工控制方案，该桥的成功建成，说明了该方法的可行性。该施工方法的应用成功为斜拉桥的施工又增添了新的内容。更多还原

【Abstract】 With employment of high strength material, improvement of structural analysis, and development of construction ways, it is a rapid developing period for cable-stayed bridge in the 90’s, 20th century. With the span’s increase and diversity of structure, cable-stayed bridge has begun to compete not only with suspension bridge in large span, but also with other bridges in middle-small span. Increasesof span and variety of bridge have caused many tasks to construction control of cable-stayed bridge. This paper putsemphasis on some key questions of construction control of cable-stayed bridge, with main content and conclusions as the following:1. Aim at optimization on multi-objects and multi-restriction of construction control of cable-stayed bridge, Method of satisfying trade-off and Method of Synthesized Parameter are united to get the solution. The character of this way is to aggregate multi-objects and multi-restriction through aggregate function. Problems of multi-objects and multi-restriction are transferred to optimization problems of single-objects and single- restriction. Lagrange Multiply Method is used to transfer the question of single-objects and single- restriction to that of none extremum, then the answer is gotten. Method of Satisfying Trade-off and Method of Synthesized Parameter are practical methods to solve question of optimization on multi-objects and multi-restriction in real projects and they have wide applied cost.2. There are many ways to confirm reasonable finished state of cable-stayed bridge. However, trail method is usually used in adjustment of cable strength. Based on none-distortion pre-strain, this paper contributes design of cable strength to none-distortion pre-strain. Multi points and internal force are selected as control objects, In finished state, these control objects are similar to that of expected. When pre-strain is added, the cable is not cut off, and it is consistent with real state.3. Based on Methods of Influence Structure, through analysis of course during the cable being tensioned, mathematical optimization model on jacking course is set up. Meeting all the conditions of jacking tool’s transitionstate carrying capacity, internal force, and displacement constraint, this method arrives pre design state and solves the question of cable in construction period.4. Optimization function of multi-objects and multi-restriction has been found to adjust errs of cable-stayed bridge in finished state. Method of Satisfying Trade-off and Method of Synthesized Parameter are adopted. Through computing example, correctness of program and feasibility of this method is validated. As a matter of fact, this model not only fits the adjustment of cable-stayed bridge in finished state, but also applies to construction control of suspension bridge, arch bridge. It has important reference value for similar questions.5. Cantilever construction or full framing is commonly used to construct cable-stayed bridge with cradle. It is the first time for Slide Die Carrier to be used in main beam, GongHe cable-stayed bridge. This method brings many new tasks to construction control. For this construction way, this paper brings forward a concept that "single-support, single-suspension" system is adopted before casting concrete; and "single-support, double-suspension" system is adopted after casting concrete. This scheme solved safety problem properly in construction. According to character of this method, a suit of construction scheme is established. Gonghe cable-stayed bridge’ s buildup proved feasibility of this method.更多还原