摘要
以典型地铁车站结构的大型振动台试验为基础,对试验相似比设计和试验结果的相似比精确度进行了分析。基于Buckinghamπ定理,采用一致相似率分析方法,建立以覆土质量为主要控制因素的等效密度方程。将需要施加的人工配重与非结构荷载统一考虑,分析地铁地下结构欠人工质量模型的相似比。研究不同的覆土厚度对重力效应的影响程度,计算了试验中的实际相似比,并通过试验测试结果证明其在提高计算精度上的有效性。结果表明,随着结构上覆土层厚度的增加,速度、频率、加速度的重力效应与人工质量模型的重力效应越接近,且加速度重力效应精度的提高幅度最大。通过调整试验条件下实际覆土层厚度,反演实际相似比,可以有效提高相似比设计的精确度。
This paper Analyzed the similarity ratio design of test and similarity ratio accuracy of test results,based on a typical large-scale shaking table test for subway station structure. Based on Buckingham π theorem,establish equivalent density equation with covering soil quality as the main controlling factor by the analysis method with consistent similar rate. Unified consideration the artificial counterweight and non-structural load to be applied,and analyze the similarity ratio of subway underground structures model of less artificial quality. Study the impact on gravity effects of different cover soil thickness,calculate the actual similarity ratio of the test,and demonstrate its effectiveness in improving the calculation accuracy through experimental test results. Results showed that,with the structure of overburden thickness increases,the gravity effect of speed frequency acceleration is closer with artificial quality model. And precision of acceleration gravity effect improve the biggest. Under the test conditions,it can effectively improve the accuracy of similarity ratio design by adjusting the actual overburden thickness and inverse derivation the actual similarity ratio.
出处
《防灾科技学院学报》
2014年第2期7-13,共7页
Journal of Institute of Disaster Prevention
关键词
地铁车站
振动台试验
相似比
重力效应
subway station
shaking table test
similarity ratio
gravity effect
