Direct Estimation of Seismic Demand and Capacity of Multidegree-of-Freedom Systems through Incremental Dynamic Analysis of Single Degree of Freedom Approximation
Direct Estimation of Seismic Demand and Capacity of Multidegree-of-Freedom Systems through Incremental Dynamic Analysis of Single Degree of Freedom Approximation
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DOI：
10.1061/(asce)0733-9445(2005)131:4(589
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发表时间：
2005-04
期刊：
影响因子：
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通讯作者：
D. Vamvatsikos;Allin Cornell;M. Asce
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文献类型：
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作者：
D. Vamvatsikos;Allin Cornell;M. Asce
介绍了一种快速准确的方法来估计地震需求和能力的第一模式为主的多自由度系统的区域范围从近弹性到全球崩溃。这是可能的，通过利用之间的连接静态pushover ~SPO！增量动态分析~IDA！虽然计算机密集型IDA需要在多个适当缩放的地面运动记录下进行几次非线性动力分析，但更简单的SPO有助于近似具有单自由度振子的多自由度系统，该单自由度振子的骨干与结构的SPO曲线相匹配，远远超过其峰值。存在类似的方法，但它们通常采用具有双线性主干的振荡器。相比之下，在静力推覆2增量动力分析（SPO 2 IDA）软件中实现的经验方程允许使用复杂的四线骨架形状。因此，所得到的系统的整个汇总IDA曲线是毫不费力地生成的，使工程师用户能够获得地震需求和能力的精确估计的极限状态，如立即占用或全球动态不稳定。使用三个多层建筑作为案例研究，该方法是有利的相比，充分的IDA。
Introducing a fast and accurate method to estimate the seismic demand and capacity of first-mode-dominated multidegree-of- freedom systems in regions ranging from near-elastic to global collapse. This is made possible by exploiting the connection between the static pushover ~SPO! and the incremental dynamic analysis ~IDA!. While the computer-intensive IDA would require several nonlinear dynamic analyses under multiple suitably scaled ground motion records, the simpler SPO helps approximate the multidegree-of-freedom system with a single-degree-of-freedom oscillator whose backbone matches the structure's SPO curve far beyond its peak. Similar methodologies exist but they usually employ oscillators with a bilinear backbone. In contrast, the empirical equations implemented in the static pushover 2 incremental dynamic analysis (SPO2IDA) software allow the use of a complex quadrilinear backbone shape. Thus, the entire summarized IDA curves of the resulting system are effortlessly generated, enabling an engineer-user to obtain accurate estimates of seismic demands and capacities for limit-states such as immediate occupancy or global dynamic instability. Using three multistory buildings as case studies, the methodology is favorably compared to the full IDA.