特征参数对单自由度结构随机临界地震响应影响的研究
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摘要
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。
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.
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.
引文
[1] Drenick R F. Aseismic design by way of critical excitation[J]. Journal of the Engineering Mechanics Division, ASCE, 1973, 99(EM5) : 649-667
[2] Iyengar R N, Manohar C S. Nonstationary random critical seismic exectations [J]. Journal of the Eng. Mech. ASCE, Proc., 1987, 113(EM4) : 529-541
[3] Drenick R F. Model-Free design of a seismic structure [J]. Journal of the Engineering Mechanics Division, ASCE, 1970, 96 (EM4) : 483-493
[4] Wang P C. Critical excitation and response of free standing chimmeys[J]. Proceedings of the International Symposium on Earthquake Structural Engineering, 1972, (1) : 269-284
[2] Iyengar R N, Manohar C S. Nonstationary random critical seismic exectations [J]. Journal of the Eng. Mech. ASCE, Proc., 1987, 113(EM4) : 529-541
[3] Drenick R F. Model-Free design of a seismic structure [J]. Journal of the Engineering Mechanics Division, ASCE, 1970, 96 (EM4) : 483-493
[4] Wang P C. Critical excitation and response of free standing chimmeys[J]. Proceedings of the International Symposium on Earthquake Structural Engineering, 1972, (1) : 269-284
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