建筑结构时程分析法输入地震波的研究

本文对形成抗震设计反应谱的国内外重要地震加速度记录进行分析,研究各种不同的记录分组方法对标定设计反应谱所产生的影响,总结各种不同类别场地上所获取的地震记录的反应谱形状的分布规律。在此基础上,为建筑结构抗震设计时程分析法所需的输入地震波提出一种基于规范设计反应谱的、与设防烈度、场地条件、震源机制、结构自振特性有关的选择原则。建议在建筑结构时程分析法中采用一组四条实际地震加速度记录(其反应谱特征周期符合一定的分布规律)作为输入地震波,计算所得的结构内力或位移算术平均,可以得到符合规范要求的比较合理和安全的结果。

Study on the Input of Earthquake Ground Motion for Time-History Analysis of Structures

Based on the analysis and study of the 112 principal domestic and foreigh earthquake acceleration records used in forming the seismic design response spectrum, thi.s paper presents the principle and methodology of selecting earthquake acceleration records for time-history seismic analysis of building structures. The selected earthquake input record is based on the design response spectrum which is related to the seismic intensity, the site condition, the hypoccntre mechanism and the natural vibration characteristics of structures. A group of 4 acceleration records,whose spectral features follow a particular distribution law, arc suggested to be the input of earthquake ground motion for time history analysis of structures. A rational and safe design can be done by simply taking the average of the resulting internal forces and deformations of the structures.