Estimating floor spectra in multiple degree of freedom systems
Estimating floor spectra in multiple degree of freedom systems
复制标题
估计多自由度系统中的底谱
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
T. Sullivan
中科院分区：
文献类型：
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作者：
P. Calvi;T. Sullivan
随着对高性能建筑需求的增加，越来越明显的是，工程师需要可靠的方法来估计结构和非结构部件的地震需求。在这种程度上，改进的底板谱预测工具将有助于评估加速度敏感的非结构和次要成分。最近，一种新的程序成功地开发和测试了简化结构的地板谱，在不同水平的弹性阻尼，在单自由度结构。本文将该方法扩展到在弹性范围内响应的多自由度（MDOF）支撑系统，提出了一种简化的高层楼板频谱模态组合方法，并考虑了发生在低层的地面运动输入的有限滤波。通过将预测结果与2 - 20层钢筋混凝土墙体结构时程分析得到的楼板谱进行比较，对该方法进行了数值验证。结果表明，该方法对多自由度系统在弹性范围内的响应具有较好的效果。未来的研究应进一步发展该方法，以允许在非弹性范围内响应的多自由度系统的底谱预测。
As the desire for high performance buildings increases, it is increasingly evident that engineers require reliable methods for the estimation of seismic demands on both structural and non-structural components. To this extent, improved tools for the prediction of floor spectra would assist in the assessment of acceleration sensitive non-structural and secondary components. Recently, a new procedure was successfully developed and tested for the simplified construction of floor spectra, at various levels of elastic damping, atop single-degree-of-freedom structures. This paper extends the methodology to multi-degree-offreedom (MDOF) supporting systems responding in the elastic range, proposing a simplified modal combination approach for floor spectra over upper storeys and accounting for the limited filtering of the ground motion input that occurs over lower storeys. The procedure is tested numerically by comparing predictions with floor spectra obtained from time-history analyses of RC wall structures of 2to 20-storeys in height. Results demonstrate that the method performs well for MDOF systems responding in the elastic range. Future research should further develop the approach to permit the prediction of floor spectra in MDOF systems that respond in the inelastic range.