【作者】 张丹；

【导师】 张新军；

【作者基本信息】 浙江工业大学 ， 结构工程， 2007， 硕士

【摘要】 吊拉组合体系桥是由悬索桥和斜拉桥发展而来的一种新型缆索支承桥梁，它结合了斜拉桥和悬索桥体系的主要优点，并克服了单一悬索桥或斜拉桥在力学性能、施工以及抗风稳定性等方面存在的不足，具有结构新颖美观、受力合理、跨越能力强、抗风性能好、施工安全和造价低等优点，在深水基础以及强风区尤能突出其优越性，为21世纪跨海连岛工程建设提供了一种比较理想的桥型方案。本文针对吊拉组合体系桥的设计方案，对吊拉组合体系桥的力学性能包括静力特性、动力特性以及抗风性能等方面进行了系统的分析和研究，研究成果对该类桥梁的设计具有很好的指导意义和参考应用价值。本文分别采用基于CR列式法的结构三维几何非线性有限元分析程序GNFEA、基于子空间迭代法的结构动力特性分析程序SDCA、结构三维非线性空气静力分析程序BSNAA以及桥梁结构颤振分析程序BSLFA，一方面分析和比较了主跨1400m的悬索桥、斜拉桥和吊拉组合体系桥的力学性能包括静力特性、动力特性、静风稳定性以及空气动力稳定性等，并探讨了吊拉组合体系桥在超大跨度桥梁中应用的可能性；另一方面，系统地分析了主要设计参数包括主缆矢跨比、吊跨比、边跨长度、斜拉索索面布置形式以及边跨辅助墩设置等对吊拉组合体系桥力学性能的影响，指出了关键的设计参数，并探讨了其合理的取值范围。通过分析和比较表明：(1)吊拉组合体系桥刚度大，活载作用下的结构变形和内力小，风作用下结构的稳定性好，是一种理想的大跨度和超大跨度缆索支承桥梁的结构型式；(2)当主缆矢跨比在0.1左右，吊跨比在0.4～0.5之间，并采用短边跨、外倾式的斜拉索索面布置形式以及在边跨设置辅助墩时，吊拉组合体系桥的各项力学性能最好。更多还原

【Abstract】 The cable-stayed-suspension hybrid bridge is a new bridge type ofcable-supported bridges, which is developed from suspension bridge andcable-stayed bridge. It takes the main advantages of the suspension bridgeand cable-stayed bridge, and also makes up the deficiencies existing in thesuspension bridge or cable-stayed bridge such as the mechanicalperformance, construction and wind stability. The cable-stayed-suspensionhybrid bridge provides a comparatively ideal bridge type for thestrait-crossing projects in the 21st century, due to its elegant shape,reasonable load carrying, strong crossing, good wind resistance, safeconstruction, low cost and so on, especially suitable for the locations facedwith bad natural conditions such as the deep-watered foundation and theviolent typhoon. This paper gives a systematic study and discussion on thestatic performance, dynamical characteristics and wind resistance of thecable-stayed-suspension hybrid bridge. The results can provide helpfulguide and valuable reference for the design of the cable-stayed-suspensionhybrid bridge.The computer programs including GNFEA based on CR formulationfor structural three-dimensional geometrical nonlinear finite elementanalysis, SDCA based on the sub space iteration method for structuraldynamic characteristic analysis, BSNAA for bridge structure nonlinear aerostatic analysis, and BSLFA for bridge structure linear flutter analysis,on one hand, are used to investigate the mechanical performance of thesuspension bridge, cable-stayed bridge and cable-stayed-suspensionhybrid bridge with a main span of 1400m including the static performance,dynamic behavior, and the aerostatic and aerodynamic stability, and thepossibility of applying the cable-stayed-suspension hybrid bridge inlong-span bridge is also discussed; on the other hand, are used toinvestigate the effect of design parameters such as the sag to span andsuspension to span ratios, the side span, the cable plane layout and thearrangements of the auxiliary piers in the side spans etc. on the mechanicalperformance of cable-stayed-suspension hybrid bridge. The key designparameters are pointed out and their reasonable values are also discussed.The results show that: (1) the cable-stayed-suspension hybrid bridgehas greater structural stiffness, less deformation and internal force underthe live load, and better structural stability under the wind action, andtherefore is an ideal structural system for long-span and super long-spanbridges. (2) The mechanical performance of cable-stayed-suspensionhybrid bridge is the best, when the sag to span ratio is about 0.1 and thesuspension to span ratio reaches the range of 0.4～0.5, and short side-span,outward inclined stay cable plane and the auxiliary piers in the side spansare used.更多还原