Error Analysis And Control Of Hybrid Simulation Test Based On Steel Structure

The Hybrid Simulation Method is an important experimental method for studying the seismic performance of structures.Combining physical tests with computer numerical calculations to make full use of the computer's computational analysis capabilities to simplify physical testing.According to the characteristics of the hybrid simulation test,the errors of the mixed simulation test results are analyzed from the two major aspects of the test equipment and the structural model involved in the mixed simulation test,and a method of controlling the error is proposed.First,the error evaluation index of the relative cumulative error is proposed.The index is an error evaluation index of a process-oriented Hybrid Simulation Test result,that is,taking into account the error of the entire test schedule of the hybrid simulation test,not just consider the error at the peak point or se veral points,which is beneficial to the overall control of the situation of Hybrid Simulation Test was performed to evaluate the quality of the Hybrid Simulation Test.At the same time,the related theory of probability theory is introduced into the error analysis.From the perspective of probability,the error of the mixed simulation test equipment and the error of the model structure are analyzed,and the probability distribution is obtained.Using the probabilistic theory of probabilistic theory,a meth od of controlling the test results of a mixed simulation experiment is proposed through the proposed error evaluation index.Using MATLAB and OpenSEES,a corresponding mixed simulation test simulation experiment was conducted.Add various types of errors by introducing random numbers.The results show that the relative cumulative error produced by the loading device exhibits a significant positive skewed distribution.The relative cumulative error of the mixed simulation test due to structural model err or also shows a positive skewed distribution,and the random variable is the absolute value of the normal distribution.After comparison,the relative cumulative error caused by the result model is far greater than the relative cumulative error caused by t he current device accuracy.The relative cumulative error caused by the model structure error will have an amplification effect similar to the structural dynamic amplification effect.That is,the relative cumulative error of the mixed simulation test caused by the structural stiffness will be amplified on the structural model stiffness error.This degree of amplification is related to the period of the natural vibration of the structure and the remarkable period of the earthquake.