特征参数对单自由度结构随机临界地震响应影响的研究

结构物受地震作用的动力分析法可分为两大类,一类是确定性分析方法,另一类是概率性分析方法。随机临界地震响应分析法作为概率性分析法的一种,是指在地震激励均方值已知的条件下,找出使响应方差最大的临界地震激励。本文针对一单自由度水塔结构,在平稳高斯过程地震动输入下,运用随机地震响应分析法,求解了随机临界地震响应,并分析了控制临界地震激励的平均零穿越率的参数P、结构阻尼比、正交函数系的选择和项数等对体系随机临界地震响应的影响,得到一些有益的结论,对实际工程的运用具有一定的指导价值。

The Effect of Characteristic Parameters on Random Critical Seismic Response of the SDOF Structure

In earthquake engineering, conventional method of seismic analysis of structure follow one of thetwo patterns: either the definitive analysis or the probability analysis. Random critical seismic responseanalysis is one of the probability analysis methods which consist of finding the critical seismic excitationfrom a class of allowable inputs that produces the highest response in a given structure. In this paper, ran-dom critical seismic analysis is used to evaluate the random critical seismic response of a SDOF water towerstructure under the Gaussian stationary random seismic excitations. Researches are carried out into the ef-fects of the paramater p, which is effectively used to control the average zero crossing rate of critical seis-mic excitation, the damp coefficient of the structure and the type and terms of the set of orthogonal func-tion on the random critical seismic response of structure. Some useful results are obtained, which can pro-vide some guidance for practical engineering.