矮塔斜拉桥结构力学行为研究与设计实践

Cable Force Optimization and Design Practice of Low Tower Cable-stayed Bridge

随着桥梁技术的发展,矮塔斜拉桥作为介于斜拉桥和连续梁(刚构)之间的一种组合体系桥型,近十年来应用较多。本桥就属于塔梁墩固结的双塔双索面矮塔斜拉桥。矮塔斜拉桥有许多力学特性都介于连续刚构和斜拉桥之间,是以梁的受弯、受压和索的受拉来承受竖向荷载。本次设计采用MIDAS/Civil分析程,及时为各个设计环节提供分析数据并对安全系数有富余量的拉索进行优化,通过适当调整索力进一步改善主梁的受力状况。

With the development of bridges technology, as a combination bridge between the cable-stayed bridge and continuous girder that cable-stayed bridge with Low Towers is more and more applied, in recent ten years. This bridge belongs to the low tower cable-stayed bridge of pylon girder pier of Twin Towers and double cable plane. Extradited cable-stayed bridge has many mechanical properties are intermediate between the continuous rigid frame bridge and cable-stayed bridge, is by the beam bending, compression and cable tension to bear vertical loads. This design uses the MIDAS/Civil analysis program, provides analysis of data for each part of the design timely, and optimizes the cable which have a surplus volume of safety factor. The girder stress condition is further improved by appropriately adjusting the cable force.