矮塔斜拉桥分丝管索鞍区混凝土抗劈裂性能有限元分析

Finite Element Analysis of Anti-splitting Performance of Concrete at Split Tube Cable Saddle Area of Low-Tower Cable-Stayed Bridge

矮塔斜拉桥分丝管索鞍区受力非常复杂,斜拉索索力很大且夹角小,锚下区域集中应力对该区域内混凝土造成很大影响。混凝土材料在很大的集中竖向力作用下会产生巨大的横向应力,即混凝土劈裂应力,该应力容易造成混凝土开裂,从而降低结构的受力性能和耐久性。对某特大桥主塔上分丝管索鞍区混凝土抗劈裂性能进行分析,利用ANSYS有限元软件建立试验模型来分析劈裂应力的大小和实际分布状况,以判断结构的安全性能。

The force at split tube cable saddle area of the low-tower cable-stayed bridge is extremely complicated,the cable-stayed force is large and in small angle,the concentrated stress to anchoring area has huge influence to concrete in this area.Under huge concentrated vertical force,the concrete material may generate huge horizontal stress,i.e.concrete splitting stress,which may easily cause concrete splitting and reduce stress performance and durability of structure.This paper analyzed anti-splitting performance of concrete at split tube cable saddle area of certain super large bridge main tower,and ANSYS finite element software was used to set up test model to analyze the degree of splitting stress and actual distribution,so to determine the safety performance of structure.