地面运动强度度量参数与双线性单自由度系统变形需求的相关性研究

CORRELATION STUDY BETWEEN GROUND MOTION INTEN-SITY MEASURE PARAMETERS AND DEFORMATION DEMANDS FOR BILINEAR SDOF SYSTEMS

研究了用峰值地面运动加速度(APG)、峰值地面运动速度(VPG)、峰值地面运动位移(DPG)、谱加速度AS(T1)(在结构基阶周期的谱加速度值)和VPG/APG作为地面运动强度度量参数(I M)与双线性单自由度(SDOF)结构系统的变形需求之间的相互关系,并用相关系数Ρ表示.通过非线性动力分析得到的结果表明,谱加速度AS(T1)和VPG与双线性SDOF结构系统的变形需求有着很好的相关性.因而,进一步研究了分别以谱加速度AS(T1)和VPG作为I M时,对3个周期(T=0.3S、1.0S和3.0S)的SDOF结构系统的变形需求估计时的有效性(这里的有效性是指在给定I M下结构响应的离散性).

The correlation between ground motion intensity measures （IM） and singledegree-of-freedom （SDOF） deformation demands is described in this study. The peak ground acceleration, velocity and displacement （APT, VPT, DPT）, spectral acceleration at the first-mode period of vibration （As（T1）） and VPT/APG are used as IM parameters, and the correlation is characterized by correlation coefficients ρ. The numerical results obtained by nonlinear dynamic analyses show good correlation between As （T1） or VPG and deforma- tion demands. Furthermore, the effect of As （T1） and VPG as IM on the dispersion of the mean value of deformation demands is also investigated for SDOF systems with three different periods T=0.3 s, 1.0 s, 3.0 s respectively（the effect here refers to the small dispersion of the response of structures conditioned on IM）.