地震模拟试验中单质点体系小比例尺模型的分级相似关系

Classified Similarity Relationships of Medium-to-Small Scale Models for the Single Particle System in Earthquake Simulation Experiments

在地震模拟试验中采用逐级加载的加载方式给试验结果带来较大误差.试验结果表明对一个模型采用逐级加载方式至大震输入后,其层间位移角为1/50;而对模型直接大震输入,其层间位移角为1/80,采用逐级加载的试验结果致使我们错误的估计原型的抗震性能;在逐级加载的地震模拟试验中,采用分级相似关系能减小逐级加载试验方式给结果带来的误差,从振动台试验加速度反应看误差达到6%左右,从位移反应上看,采用分级相似关系后,位移反应与直接进行大震试验结果较为接近.

In earthquake simulation, gradually loading brings great errors on the test results. The shaking table test results show that the inter-story drift angle of the model can reach 1/50 if the model is gradually loaded till strong earthquake loading while the drift angle can reach 1/80 when it is directly loaded. Therefore, gradually loading in the shaking table test will incorrectly estimate the seismic resistance capability of structures. In the shaking table test the method of gradually loading which uses classified similarity relationships can eliminate the testing errors caused by gradually loading. The errors of structural acceleration response of shaking table test is 6% while the response of displacement of shaking table test using classified similarity relationships is close to that using directly loading.