Wavelet Fitting Artificial Ground Motion Of D-V-A Combined Spectrum And Its Input High-level Structure Dynamic Analysis

For some specific structures in the project,it is necessary to use time-history analysis method to check the rationality of the results of mode-decomposition response spectrum method.However,due to the limited field-specific seismic records,sometimes even the real-time seismic records of similar sites are calculated.The results will also produce greater dispersion and cannot be used to guide engineering practice.The uncertainty of ground motion input limits the popularization and use of the time-history analysis method to some extent,and it also restricts the development of the current seismic design theory.At present,the pace of urbanization in China is accelerating and high-level has become the most popular form of construction.The speed evaluation method suitable for solving high-level,large-span,medium-and long-period seismic responses has also received extensive attention and application.However,our country's current seismic code only considers the effect of response spectrum shape and peak acceleration on the structural response,and neglects the more significant role of ground motion velocity history on the dynamic response of medium-and long-period structures.The dynamic analysis under long-period earthquake has some irrationality.This article comprehensively considers the above two aspects.Under the guidance of the wavelet analysis theory,based on the ground motion adjustment method based on the wavelet method,the following work is mainly carried out:(1)Using the base B-spline wavelet to simulate the true ground motion,the Mallat decomposition and reconstruction algorithm is used to adjust the true groundmotion to fit the field design response spectrum in the "double band";(2)The "double-band " fitting site response spectrum was extended to "multi-band" fitting,and the use of "multi-band" fitting method to adjust the true ground motion to fit the D-V-A combined spectrum and PGV;(3)Establish the finite element model of high-rise structure,input the ground motion before and after adjustment,conduct the elastic time history analysis under the frequent earthquake and the elasto-plastic time history analysis under the rare earthquake.The artificial ground motion generated by the wavelet method fitting the DVA combined spectrum and peak velocity comprehensively takes into account the effects of ground motion PGA and PGV,and the ground motions adjusted by the wavelet method incorporate less of the general man-made ground motions.Human factors can largely preserve the original ground motion characteristics.And because the wavelet method adjusts the ground design spectrum and related peaks during ground motion adjustment,it also has the common ground motion of the site and is a high-quality artificial ground motion.In addition,the combination of wavelet fitting combined spectrum and PGV artificial ground motion method can be used to construct a series of ground motions that meet the conditions of the proposed high-rise structure.A small sample database for ground motion input can be constructed,and a library for enriching ground motion input can be constructed.It provides a new idea for selecting ground motion for high-level structural time-course analysis.