桥梁结构设计中拉压杆模型设计法的应用

对于钢筋混凝土桥梁结构,现行规范通常采用以截面为分析对象的极限状态法(即截面内力法)进行设计。此方法对于结构的有些区域比较适用,但对有些区域就不合理,甚至不能用此方法设计。欧美国家提出一种在有限元分析基础上适用于混凝土结构各部位配筋设计的拉压杆模型设计法,但国内对此方法还缺乏系统研究。现介绍了建模原理、理论研究和工程实践研究,并提出进一步研究的内容。

Strut-and-tie Model in the Design of Bridge Structures

In current Chinese code,reinforced concrete structures are normally designed with the limit state design method in which critical cross sections are analyzed.The method is very applicable and rational for certain parts of structures,but it is not suitable for some parts of structures,and even some parts of the structure can not be designed by means of this method completely.In recent years,the Strut-and-tie model method is proposed and applied in the European and American codes,which is based on the finite element analysis and is suitable for all types and all parts of structures;however,there is few study of this new method in China.This paper introduces the design principle,theory research and project adoption of the method,and also advances some future research subjects at its final part.