Abstract: Taking a low-pylon cable-stayed bridge as the engineering background, the stress of concrete in anchorage zone of cable tower with strand-separating saddle was simulated and analyzed by the Abaqus & Hypermesh simulation method. The idea of joint finite element simulation, the derivation of equivalent uniform surface load and equivalent linear surface load were introduced, and the main analysis results of pylon concrete under different load modes were given. The results show that: 1) the concrete around the filament separator will have larger principal stress, but it will soon spread to uniformity; 2) the maximum principal tensile stress of the concrete at the lower edge of the filament separator varies greatly under different load modes, and the stress under the circumferential uniform plane load is significantly larger than that under the circumferential linear plane load.

Key words: bridge engineering, low-pylon cable-stayed bridge, strand-separating saddle, equivalent loads, local stress analysis

摘要： 以某矮塔斜拉桥为工程背景，利用Hypermesh+Abaqus联合仿真的思路，模拟分析了该桥索塔分丝管型索鞍锚固区鞍下混凝土的应力情 况。介绍了有限元联合仿真的思路、等效均匀面荷载和等效线性面荷载的推导，并给出了在不同荷载作用模式下索塔混凝土的主要分析结果 。结果表明：分丝管外围混凝土会出现较大的主应力，但很快扩散至均匀；分丝管下缘混凝土最大主拉应力在不同荷载作用模式下差异较大 ，且在环向均匀面荷载下比在环向线性面荷载下明显要大。

关键词: 桥梁工程, 矮塔斜拉桥, 分丝管型索鞍, 等效面荷载, 局部应力分析