预应力混凝土桥梁徐变模型试验相似关系研究

讨论预应力混凝土桥梁徐变模型试验主要影响因素及处理原则,提出了模型梁设计时需满足的相似关系;基于CEB-FIP(MC90)徐变模型,建立了模型梁与原型梁跨中徐变长期上拱的相似关系.模型梁试验推算值与实桥测试值比较表明,推算值具有较好的精度.本文为预应力混凝土桥梁非足尺结构模型的徐变试验研究提供新思路,建立的公式在工程试验研究中具实用性.

Research on Similarity Relationship for Model-based Creep Experiment of Prestressed Concrete Bridges

After discussing the major factors affecting model-based creep experiment and the rules to dispose in designing experimental model,the needed similarity relationship for constructing models is presented,then the similarity relationship of cambers due to creep between model and original is put forward based on creep expression in CEB-FIP Model Code 1990.The comparison between deduced values from experimental data and tested resultants in original bridges shows that deduced values hold agreeable precision.This paper provides novel train of thought to model-based creep experiment while adopting non-full dimension model,and the established formulae are useful in engineering research.