【作者】 陈永健；

【导师】 房贞政；

【作者基本信息】 福州大学 ， 桥梁与隧道工程， 2011， 博士

【摘要】 人们对地锚式悬索桥的研究已比较成熟和完善，并形成了相关的分析理论和方法。近年来，国内外学者对于普通单塔、双塔自锚式悬索桥也进行了大量的研究，获得了许多有益成果。但尚无关于自锚式悬索桥较为系统的规范和技术标准。随着几座多塔悬索桥的出现，相关的研究工作也已开展，其中主要是针对多塔地锚式悬索桥的。对多塔自锚式悬索桥这一新型结构形式的研究则很少，人们对它在理论和实践上的认识还不够全面和深入。因此，对其力学性能进行研究具有重要意义。本文采用模型试验、解析分析法和有限元分析法，对多塔自锚式悬索桥的受力性能进行研究，主要工作内容如下：1、基于挠度理论，结合多塔自锚式悬索桥的特点，考虑主塔纵向刚度和加劲梁压弯效应的影响，建立了多塔自锚式悬索桥的平衡微分方程和变形协调方程。2、采用“代换梁法”，推导了多塔自锚式悬索桥的内力、变形的实用计算公式。给出挠度理论解析法的计算流程，并编制程序，通过算例验证了解析法与程序的正确性。程序计算流程清晰，只需输入主要设计参数即可进行近似计算，适用于多塔自锚式悬索桥的初步设计和参数分析。3、对在建的三塔自锚式悬索桥——福州市螺洲大桥进行全桥模型试验，探讨该结构的力学行为规律。试验实测值与有限元的计算结果吻合良好，验证了分析与试验结果的正确性。4、采用本文的解析法计算程序和ANSYS有限元程序，研究结构参数对多塔自锚式悬索桥力学性能的影响。分析结果表明，主缆矢跨比、加劲梁边主跨比、加劲梁拱度、加劲梁刚度、主塔纵向刚度和缆索刚度等结构参数对其受力性能的影响各不相同。其中，矢跨比和主塔纵向刚度对结构整体刚度影响显著。5、采用有限元分析方法，对多塔自锚式悬索桥不同的主索鞍约束体系、加劲梁约束体系以及锚跨的设置等方面进行了研究，并将多塔自锚式悬索桥与相同跨径条件的多塔地锚式悬索桥、常见的双塔自锚式悬索桥进行比较。根据分析结果，提出对多塔自锚式悬索桥体系选择的建议。更多还原

【Abstract】 Relatively mature and perfect research has been done on earth-anchoredsuspension bridges and a serious of related analytical theories and methodshave been formed. In these years, scholars at home and abroad have also donea great deal of study on ordinary self-anchored suspension bridges with singletower or double towers and gained lots of useful results. However, there are nocomparatively systematic rules and technical criterions about self-anchoredsuspension bridges. With the emergence of several multi-tower suspensionbridges, related research has also been carried out, which is mainly forearth-anchored suspension bridges. But the research on the new structure ofself-anchored suspension bridges with multi-tower is rare. Theoretical andpractical knowledge about it is still not comprehensive and deep enough.Therefore, it is of great significance to study its mechanical property. In thethesis, model test, analytical method and FEM are used in the research on themechanical behavior of self-anchored suspension bridges with multi-tower.The main contents of this dissertation are discribed as follows:1. Based on the deflection theory and the features of self-anchoredsuspension bridges with multi-tower. When we establish the equilibriumdifferential equations and deformation compatibility equations ofself-anchored suspension bridges with multi-tower, the longitudinal stiffnessof main tower and Beam-Column effect of the stiffening girder are considered.2. According to substitutional beam method, practical formulas are gainedfor the structure force and deformation of self-anchored suspension bridgeswith multi-tower. The calculation procedure of deflection theory analyticalmethod and the program have been clarified. The accuracy of analyticalmethods and the program are verified by some examples. The program is veryexplicit and the approximate results can be obtained by inputing designparameters. It’s very fit for the primary design and parameters analysis ofself-anchored suspension bridges with multi-tower. 3. A model test has been done about Luozhou bridge in Fuzhou which is inprogress. And it is a self-anchored suspension bridge with three towers. We dothis test in order to investigate the mechanical behaviour of it. The testmeasured values and FEM results are compared to verify the correctness offinite element analysis and testing.4. Use the program of deflection theory and ANSYS program to study theeffect of main structural parameters on mechanical property of self-anchoredsuspension bridges with multi-tower. The results show that the structuralparameters of rise-span ratio, ratio of side span to center span, stiffness andarch of the stiffening girder, longitudinal stiffness of main tower and stiffnessof cable have different effect on its load property, of which the rise-span ratioand longitudinal stiffness of main tower have significantly effect on thestructural stiffness.5. Based on FEM, some research have been done on different restrictionschemes of main saddle and stiffening girder, and whether there exists theconstitution of outside stretching span of self-anchored suspension bridgeswith multi-tower. Comparisons have been made between self-anchoredsuspension bridges with multi-tower, earth-anchored suspension bridges withmulti-tower and self-anchored suspension bridge with double towers. Someadvices on choosing system of self-anchored bridges with multi-tower aregiven according to the analysis.更多还原