【摘要】 自锚式斜拉-悬吊协作体系桥是一种新近出现的国内外研究尚少的桥型.以大连港航道桥设计方案为背景,利用空间有限元模型通过与地锚式桥的动力特性对比分析,得出大跨径自锚式斜拉-悬吊协作体系桥具有主梁竖向弯曲振型总是优先出现等新的动力特点;针对主跨主缆易于振动的特征提出了采用斜向交叉拉索的抑振措施,并给出其最优设置位置为0.287 5跨度处;利用反应谱方法对该桥型的动力性能初步匡算表明,该新型体系桥的地震响应较大,其抗震设计应引起足够的重视.更多还原

【Abstract】 Self-anchored cable-stayed suspension bridge,as a new type of bridge,is rarely investigated.Based on spatial finite element model,dynamic characteristics of the Dalian Harbor′s sea-route bridge belonging to long span self-anchored cable-stayed suspension bridge are obtained and some new dynamic traits such as preferential appearance of the vertical bending modes for girder are shown in comparison with those of earth-anchored cable-stayed suspension bridge.The vibration-restraining measure setting intersecting inclined cables is proposed because the main cables in the main span are subject to vibration and the most reasonable setting position,which is 0.287 5 position of the main span,is given.The dynamic property is preliminarily analyzed with response spectrum method and the results show that the seismic responses of the kind of bridge are greater so that the anti-seismic design should be paid more attention to.更多还原