摘要：提出了一种新的悬索桥——内锚悬索桥,主要由主缆、吊索、桥塔、水平杆、墩和加劲梁组成,水平杆与桥塔垂直相交,可作为引桥的一部分,主缆依次绕过塔顶、水平杆、塔底,最终锚固在水平杆上.按照力学原理,建立了结构内力及地基反力的计算式,提出了合理偏心线和合理宽度线的概念,所提出的合理偏心线可使桥塔在索力作用时处于无弯矩状态,而合理宽度线可保证材料得到充分利用.研究表明,在保持传统地锚悬索桥跨径的前提下,内锚悬索桥可去掉体积庞大的锚碇,主缆水平张力仍由基础反力平衡,但其基础受力为斜向下,通过适当的结构布置和采用明挖基础,还可以使塔基础和墩基础合二为一.故内锚悬索桥比传统地锚悬索桥受力更为合理,在保证结构安全、经济、耐久性的前提下,内锚悬索桥更容易做到力与美的统一.%A new suspension bridge called internally anchored suspension bridge,which is mainly composed of main cable,sling,cable tower,horizontal bar,girder and auxiliary pier,was developed.The horizontal bar as a part of the approach bridge perpendicularly intersects the main tower.The main cable passes by tower top,horizontal bar,and tower bottom in turn,and eventually,it is anchored on the horizontal bar.Based on the mechanical principles,the calculation formulas of internal force in structure and foundation reaction force were established,and the concepts of reasonable eccentric line and reasonable breadth line were presented.The first concept allows the main tower to bemomentless,while the second concept ensure to make full use of material.The research shows that under the premise of guaranteeing the span of traditional ground anchored suspension bridge,the large-volume anchorage can be removed from the internally anchored suspension bridge.The horizontal tensions in main cables can still be balanced by the foundation reaction,but the force on the foundation is inclined downward.Based on appropriate structural arrangement and adoption of open-cut foundation,the foundation of main tower and the pier foundation can be incorporated into one.Consequently,more reasonable internal forces can be achieved in the internally anchored suspension bridge compared to the traditional ground anchored suspension bridge,and in addition,force and beauty can be readily unified in the internally anchored suspension bridge under the premise of ensuring the safety,economy and durability of structures.
