根据不同场地类别建立减震性能曲线克服了地震波减震性能曲线存在差异的问题,对减震结构的简化设计与分析具有重要意义。本文在单质点体系简谐激励下,以位移减震率ηd与加速度减震率ηa解析表达式为基础,以特征周期为依据对大量地震波进行场地分类,并对所有不同场地类型地震波进行时程分析,作出可用于各类场地地震波的减震性能曲线,考虑了场地特征周期对减震性能曲线的影响,从而确定用于计算弹性时程下减震结构的位移与加速度减震率拟合公式;在此基础上又建立了考虑结构非线性状态减震性能曲线,曲线表明增加阻尼比虽然能降低结构的塑性率,但降低效果有限,且塑性率越大,增加阻尼比的减震效果越不明显。本文的研究扩展了减震性能曲线的应用范围,为减震结构的性能化设计提供了重要依据。
关键词:性能曲线,减震率,场地类别,地震波,时程分析
Abstract
The damping performance curve is used to adjust the seismic response when the damping ratio is different from the inherent damping ratio of the structure. It is of great significance to the simplified design and analysis of the damping structure. This paper first derives the analytical expressions for the displacement damping rate ηd and acceleration damping rate ηa of the single-particle system under harmonic excitation, then classifies a large number of seismic waves based on the characteristic period, and conducts time history analysis of all different types of seismic waves , To draw the damping performance curve that can be used for seismic waves in various sites. Through elastic time history analysis of a large number of seismic wave records classified by site and statistical and non-linear regression analysis of the results, the parameter of excitation period Tg is added into the consideration range, so as to determine the calculation of the seismic wave under the elastic time history. Fitting formula of displacement and acceleration damping rate. A damage performance curve considering the nonlinear state of the structure is established. The analysis shows that although increasing the damping ratio can reduce the plasticity of the structure, the reduction effect is limited. The greater the plasticity, the less obvious the damping effect of increasing the damping ratio. The research in this paper expands the application range of the damping performance curve and provides an important basis for the performance-based design of damping structures.
Keywords: performance curve, shock absorption rate, site category, seismic wave, time history analysis
关键词
性能曲线 /
减震率 /
场地类别 /
地震波 /
时程分析
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