波形钢腹板部分斜拉桥受力性能分析

Analysis of Load Bearing Performance of Extradosed Bridge with Corrugated Steel Webs

为探讨200m跨径范围内波形钢腹板部分斜拉桥的适用性,采用有限元分析,对比研究了跨径布置相同、承受荷载能力相当的波形钢腹板部分斜拉桥、混凝土部分斜拉桥、波形钢腹板斜拉桥和波形钢腹板连续刚构桥4种结构形式桥梁各主要构件的受力性能。结果表明:波形钢腹板部分斜拉桥主梁的结构形式及受力特性介于波形钢腹板连续刚构桥和波形钢腹板斜拉桥之间,更接近于连续刚构桥;与同跨径混凝土部分斜拉桥相比,波形钢腹板部分斜拉桥自重减轻,主梁结构更轻型化;混凝土部分斜拉桥与斜拉桥的界定方法和斜拉索容许应力的取值方法同样适用于波形钢腹板部分斜拉桥。

To examine the applicability of extradosed bridge with corrugated steel webs to bridge project that has main span lengths within 200 m,finite element analysis was carried out to compare the load bearing performance of the main components in four types of bridges with same span arrangement and load bearing capacities,including the extradosed bridge with corrugated steel webs,concrete extradosed bridge,cable-stayed bridge with corrugated steel webs and continuous rigid-frame bridge with corrugated steel webs.The results show that the structural form and load bearing behaviors of the main girder of extradosed bridge with corrugated steel webs are between those of the continuous rigid-frame bridge with corrugated steel webs and the cable-stayed bridge with corrugated steel webs,and closer to those of the continuous rigid-frame bridge.Compared to the concrete extradosed bridge with the same span arrangement,the self weight of the extradosed bridge with corrugated steel webs is reduced,and the structure of the main girder is lighter.The methods to distinguish concrete extradosed bridge from the cable-stayed bridge as well as the methods to gain the allowable stresses of the stay cables are also applicable to the extradosed bridge with corrugated steel webs.