混凝土板拉桥详细有限元分析  

Detaled Analysis and Research of Slab Bridge With Finite Element Method

作　　者：李娜[1] 李杰[1] 

机构地区：[1]郑州大学土木工程学院,河南郑州450001

出　　处：《西华大学学报（自然科学版）》2008年第3期85-88,共4页Journal of Xihua University:Natural Science Edition

摘　　要：板拉桥以预应力混凝土刚性板代替柔性拉索,与普通斜拉桥相比,在拉索的防腐、疲劳、振动等方面具有诸多优势。本文以独塔单面板拉桥——广东番禺沙溪大桥为工程背景,采用大型有限元计算软件ALGOR建立完整、详尽的全桥组合有限单元模型,对板拉桥的施工阶段和成桥后荷载作用下的力学行为进行分析研究,探讨了混凝土收缩、徐变、体系升降温和四种活载加载模式对沙溪大桥施工的影响。通过分析可以看出,沙溪大桥的施工过程是合理的,收缩、徐变和温度效应对预应力混凝土板拉桥的变形及内力有很大影响。The slab bridge is a novel bridge style.It substitutes the flexible cable with the pre-stressed concrete rigid slab.Compared with the traditional cable-stayed bridge,it has a great deal of advantages in many aspects such as the cable's preservation,fatigue and vibration.Based on the project background of the slab bridge with single-tower and single-slab,Shaxi Bridge in Panyu,Guangdong,China,the paper presents the detailed process of building up the integrated finite element model for the bridge by ALGOR,a general FEM software.It studies the effect of mechanics behavior in all construction phases and completed bridge stage under various loads.It discusses the effect of concrete's shrinkage,creep,changes of global temperature and four-type live load on Shaxi Bridge.Finally,it is concluded that the construction process of Shaxi Bridge is reasonable,and that the influence of shrinkage,creep and temperature load on the prestressed concrete slab bridge is obvious.

关 键 词：板拉桥 混凝土 组合有限元 

分 类 号：U441[建筑科学—桥梁与隧道工程]