在同济大学4×4m双向模拟地震振动台上对两跨钢框架进行了动力试验。本文研究利用系统识别对试件的线性特性进行参数识别。根据振动台台面再现的地震记录——水平双向输入波和试件相应的反应时程测量数据,用单纯形的参数估计方法对试件的质量、偏心率、刚度以及周有频率等参数在时域中进行识别。本文还闸明单纯形法的基本原理和参数识别的主要步骤。 A two-span steel frame was subjected to a dynamic test on a 4×4m two-way simulated seismic shaker at Tongji University. In this paper, we use system identification to identify the linear characteristics of specimens. According to the seismic records reproduced by the vibration table, the horizontal bidirectional input waves and the corresponding response time measurement data of the test pieces, the parameters of the simplex are used to estimate the parameters such as the mass, eccentricity, stiffness, and the circumferential frequency of the test piece. Identification in the domain. This paper also explains the basic principles of the simplex method and the main steps of parameter identification.