To meet the need of constructing fixed cross strait links, super-long span bridge with a main span over 2 000m is considered as a candidate for their ability to cross deep and wide straits. To this end, some super-long span bridges with proper cable and girder systems were previously proposed and studied. The major design considerations are aimed at adopting new cable material, increasing the entire rigidity of the bridge, stabilizing the dynamic characteristics, strengthening the deck sections, etc. In this paper, a brief review of main cable and girder system is first given of the concepts previously proposed for the design of super-long span bridges. Then some typical examples are studied, focused on various issues related to the design of super-long span bridges, including composite cable, the unstressed length and tension force of the main cable, the stiffness and mass effects of the deck on critical wind speed, and the critical wind speed of various cable systems. The most challenges in super-long span bridges are to solve aerostatic and aerodynamic instability at required design wind speed. In this connection, the wind-induced aerostatic instability of super-long span bridges is studied by a two-stage geometric nonlinear analysis for dead loads and wind loads. The developed program adopted herein for geometric nonlinear analysis was verified and confirmed before. The proposed methods (i.e. composite cable, slotted girder, increasing deck stiffness and mass, cable layout, etc.) obtained for all the examples are in agreement with this study, which indicates applicability of the design approaches presented.

中文翻译：

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两阶段几何非线性分析考虑静气不稳定性的超大跨度桥梁可行性研究

为满足两岸固定连接线建设需要，主跨2000以上的超大跨度桥梁米被认为是他们跨越深渊和宽阔海峡的能力的候选人。为此，之前提出并研究了一些具有适当索梁系统的超大跨度桥梁。主要设计考虑旨在采用新的索材，增加桥梁的整体刚度，稳定动力特性，加强桥面截面等。本文首先对主索和主梁系统进行简要回顾以前为超大跨度桥梁的设计提出的概念。然后研究了一些典型例子，重点研究了与超大跨度桥梁设计相关的各种问题，包括复合索、主索的无应力长度和张拉力、桥面刚度和质量对临界风速的影响、以及各种电缆系统的临界风速。超大跨度桥梁面临的最大挑战是解决所需设计风速下的空气静力和气动不稳定性。在这方面，通过静载和风荷载两阶段几何非线性分析研究了超大跨度桥梁的风致静气失稳。本文采用的用于几何非线性分析的开发程序之前已经过验证和确认。为所有示例获得的建议方法（即复合电缆、开槽梁、增加甲板刚度和质量、电缆布局等）与本研究一致，这表明所提出的设计方法的适用性。在这方面，通过静载和风荷载两阶段几何非线性分析研究了超大跨度桥梁的风致静气失稳。本文采用的用于几何非线性分析的开发程序之前已经过验证和确认。为所有示例获得的建议方法（即复合电缆、开槽梁、增加甲板刚度和质量、电缆布局等）与本研究一致，这表明所提出的设计方法的适用性。在这方面，通过静载和风荷载两阶段几何非线性分析研究了超大跨度桥梁的风致静气失稳。本文采用的用于几何非线性分析的开发程序之前已经过验证和确认。为所有示例获得的建议方法（即复合电缆、开槽梁、增加甲板刚度和质量、电缆布局等）与本研究一致，这表明所提出的设计方法的适用性。