Evaluation Of Characteristic Parameters Of Earthquake Records And The Influence On The Seismic Design

The reasonable earthquake ground motion input parameters are necessary to ensure the correct designed results. Because we should have a deep understanding of earthquake ground motion characteristics before selecting the appropriate record, so the importance of the study of seismic wave characteristics is highlighted. In this paper many typical records are chosen from a lot of ground motion records as the basic data for calculating the relativity between the characteristic parameters and magnitude or epicenter distance, as well as between the different parameters. And combinating the elastic and inelastic response spectra, the relativity and sensitivity between spectrum parameters and characteristic parameters are analyzed and verified. Then, the accuracy of these parameters and the better parameters on evaluating the damage characteristics of ground motion are obtained and the influence on seismic design is summarized.In this thesis, the main research works are as follows:1. According to certain principles, 61 earthquake acceleration time history records at home and abroad are selected as basic data. By classifying the records and analyzing the basic characteristics of the records, three basic elements of ground motion and the meaning of its parameters are elaborated. Besides, the basic principles and the methods for screening records are discussed and ground motion records screening for following analyze are preliminary offered.2. Though analyzing the relativity between the characteristic parameters and magnitude or epicenter distance, as well as between the different parameters, it can be concluded that different parameters represents different meaning and has different reliability in evaluating damage characteristics of ground motion records. Then because various parameters have their own advantages and disadvantages, some new parameters for evaluating damage characteristics of ground motion records are proposed in this paper.3. Base on the spectrum theory, the relativity between characteristic parameters and the parameters of the elastic (Elastic single-particle system) and inelastic (Bilinear single-particle system) response spectra is estimated. And the accuracy and applicability of these characteristic parameters are verified. Results shows that , for PD and AAVSI has more comprehensive consideration simultaneously considering the effect of the maximum ground acceleration, duration, and frequency,compared with other parameters, both are better parameter which can effective assess the amplitude of acceleration response and the intensity of the input energy.4. Influence of characteristic parameters impact on bilinear spectra of various ductility ratios is discussed. Results are as follows: 1) the relativity between characteristic parameters and the parameters of the Elastic single-particle's acceleration spectra is also suitable for Bilinear single-particle system. And the sensitivity of acceleration response spectrum to ductility ratio is affected by site conditions.2) Ductility ratio has intricately impact on total input energy, and the main factors are structural natural periods and duration of ground motion record.3) the relativity between characteristic parameters and the parameters of the input energy spectra is also suitable for damping energy spectra and hysteretic energy spectra. But, there are many different situation of ductility ratio and duration impact on damping energy spectra and hysteretic energy spectra.Finally, some conclusions are given and the topics for further research are presented.