矮塔斜拉桥索鞍受力分析

以山西大同十里河矮塔斜拉桥为研究对象,为了准确地校核该桥索鞍的实际受力状况,文章采用空间有限元方法进行计算分析,将实际索力按空间抛物面形式的面压力施加在各个对应孔道上,并分析了拉索孔道施工偏差对运营阶段塔的影响.分析结果表明,该桥索鞍内必须设置钢套管否则混凝土会被压裂,同时施工时要严格控制孔道的光滑及对称性,否则塔会发生侧倾影响全桥的正常运营;孔道的最外侧是受拉应力最大的点,要适当加厚外缘的钢板厚度或在该区域做局部加强处理.

Analysis of Saddle Structures In Low Tower Cable-stayed Bridge

Based on the design drawings of low tower cable-stayed bridges in Datong city to verify the actual stress of the saddle structures.By transforming the cable force into actual paraboloidal pressure on the corresponding hole area,the analysis can reflect more accurate results.And the paper also studies the tower's deflection due to the construction error.The results show that the saddle must contain steel tubes otherwise the concrete will be crushed.At the same time the smoothness and the symmetry of the hole in the tower saddle must be guaranteed otherwise the tower will cause side tipping then the normal use of the bridge will be affected.The outer flank of the hole in the tower is the largest tensile stress zone,so the exterior margin of the steel tube should be thickened or some partial strengthen method need to be used for that particular area.