预应力混凝土简支梁小比例结构模型相似关系  

Similarity Law for Small-Sized Model of Prestressed Concrete Simply Supported Beams

作　　者：胡锡勇[1] 卢文胜[1] 沈伟明[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《结构工程师》2011年第1期110-117,共8页Structural Engineers

基　　金：科技部国家重点实验室基础研究资助项目(SLDRCE08-B-02)

摘　　要：预应力结构小比例模型试验中,难以实现真实模型相似,所以需要研究完备模型设计方法以确保模型与原型的相似及实现的可能性。以预应力混凝土简支梁为研究对象,在预应力钢筋的材料特性与混凝土材料特性相似系数不匹配的情况下,研究模型的相似性。由于无法满足材料层面相似,引出模型试验以"结构效应"相似为基准的概念,在弹性范围内,以此概念导出了预应力结构小比例模型相似设计方法,利用推导公式比较和验证该设计方法的正确性。利用有限元软件分析验证了该设计方法在弹塑性阶段的正确性,同时提出保证弹塑性阶段相似的要求。In the test for small-sized prestressed structure models,true model is hard to be achieved.Therefore,practical model design method was studied.This kind of method can not only ensure the similarity but also simplify the fabrication of the model.A prestressed concrete simply supported beam was taken as the research object.The similarity of the small-sized model was studied under the condition of the mismatching of the similarity factors between prestressed tendon and concrete.The conception of model similarity law based on the similarity of ＂structural effect＂ was also put forward.According to the conception,a kind of design method was deduced in elastic range and was verified by the deduced equation in elastic range and by finite element analysis in elasto-plastic range.On that basis,some requirements were proposed for the similarity of prestressed concrete simply supported beams in elasto-plastic range.

关 键 词：小比例模型 预应力 相似关系 弹塑性 

分 类 号：TU378.2[建筑科学—结构工程]