预应力混凝土桥梁钢混协作关系研究

Coordinating Relations of Steel and Concrete of Prestressed Concrete Beam Bridges

随着桥梁跨径的增大 ,预应力索对混凝土的影响 (如徐变 )以及混凝土对预应力索 (如预应力损失 )的影响对桥梁设计和施工显得越来越重要 .针对以往将预应力转化为外荷载进行结构计算分析的局限性 ,基于预应力混凝土结构的受力机理 ,提出钢混协作关系的概念 ,论述基于此概念的桥梁结构分析思想 .通过文中研究开发的大型桥梁分析系统 BRC与国内某知名软件系统对一大型桥梁结构的分析对比 ,说明其合理性和有效性 ,软件系统

Following the augmentation of bridge spans, analysis of mutual affect between prestressing cable and concrete, such as prestressing cable to creep of concrete or creep of concrete to loss of prestress of prestressing cables, is becoming more and more important to bridge design and construction. In consideration of the limitation of transforming prestress as external forces to carry on structural analysis, the concept of coordinating relations between steel and concrete is put forward to set up the analysis theory of prestressed concrete bridges. The rationality and validity are demonstrated by a comparison between analytical results of our developing software system BRC of this paper and that of a well-known software system in China through a practical large-scale bridge.The developed software system BRC can be applied effectually to practical engineering analysis.