中文摘要：

为确定三塔悬索桥的合理纵向约束体系,以泰州长江大桥为研究对象,综合考虑各静动力分项作用效应及作用效应组合,对纵向弹性索和粘滞阻尼器2种附加约束的设置位置及参数优化进行研究,重点分析了2种可行布置方案的合理参数选取,并在确定参数下,对比了2种可行方案的效果。结果表明：全漂浮体系、全阻尼器体系和全弹性索体系均不是理想的约束体系;可行的约束体系是仅中塔设置弹性索和中塔弹性索加边塔阻尼器体系,前者可显著减小梁端水平位移,并适当减小塔顶水平位移、梁端转角、主梁挠度并增加主缆抗滑系数,但地震作用下中塔受力集中,后者可改善中塔地震受力集中状况,但增大了边塔地震力;考虑到中塔受汽车作用控制而边塔受地震作用控制,以及粘滞阻尼器制造和维护困难,推荐采用仅在中塔与主梁间设置纵向弹性索的结构体系。

英文摘要：

In order to find out the appropriate longitudinal constraint system for three-tower suspension bridge,considering the static and dynamic subitem action effects and combinations for action effects,the location arrangement and parameter optimization for longitudinal elastic cables and viscous dampers of Taizhou Yangtze River Bridge were studied.The parameter selections of two practical alternatives were focused on,and the effects of the two options were compared in the reasonable parameters.The results show that full floating system,all dampers system and elastic cable system are all not ideal constraint systems.Feasible constraint system is only mid-tower elastic cable setting and combination of mid-tower elastic cable and viscous dampers in side tower.The former can significantly reduce the horizontal displacement at girder end,can properly reduce the horizontal displacements on the tower top,rotative angle at the girder end and deflection of main girder and can increase the anti-slipping safety factor between the main cable and saddle.But the seismic force concentrates in the mid-tower,the later can improve the condition of seismic force concentrated in the mid-tower,but increases the seismic force of the side tower at the same time.Considering the mid-tower and side tower are controlled by live load and earthquake respectively and the difficulty on the manufacture and maintenance of viscous dampers,longitudinal elastic cable only set between mid-tower and main-girder can be adopted as the recommended constraint system.