大型结构地震模拟振动台及台阵的试验精度分析

Precision analysis of large structure seismic experiment utilizing shaking table for earthquake simulation

近年来我国振动台设备发展迅猛,相关试验技术也随之提升,渐成研究热点,然而目前对利用振动台设备开展结构抗震试验的精度如何仍关注较少。本文结合中南大学所建设的振动台台阵试验系统,介绍台阵的具体组成和技术,并综合已开展试验工作,探讨振动台模型试验的精度,明确了重力失真效应、模型材料和制作水平、强地震复现等重要误差因素,并给出了现有实验室技术水平下的误差范围,表明需减小不必要误差以提升试验精度,避免错误试验结论。

In recent years,construction of shaking table equipment in China is growing rapidly,and corresponding research field is also focused on. However,precision of structural seismic experiment utilizing shaking table is still paid less attention now. In this paper,the specific composition and technology are introduced according to shaking table array system of central south university. Referring to already performed work,precision of shaking table experiment is discussed. Several important error factors are confirmed and described,such as the gravity distortion effect,model manufacture and material,and strong earthquake reproduction by shaking table. And corresponding error ranges of the laboratory technical level are given. Finally,it is indicated that unnecessary errors should be reduced to improve the experimental precision,and avoid giving wrong conclusion.