Implications of Intensity Measure Selection for Seismic Loss Assessment of 3-D Buildings
Implications of Intensity Measure Selection for Seismic Loss Assessment of 3-D Buildings
复制标题
烈度测量选择对 3-D 建筑物地震损失评估的影响
DOI：
10.1193/112215eqs177m
复制
发表时间：
2016
影响因子：
5
通讯作者：
P. Bazzurro
中科院分区：
文献类型：
--
作者：
M. Kohrangi;D. Vamvatsikos;P. Bazzurro
目前针对特定建筑物的损失评估最先进的技术涉及地震危害和建筑物抗震需求的结合。后者以建筑物第一模态的谱加速度 Sa(T1) 为条件，作为地面运动强度测量 (IM)，并且通常通过对二维 (2-D) 模型进行非线性动态分析来估计。通过使用可以引入更高保真度的改进 IM 的新提议，损耗估计的准确性成为一个悬而未决的问题。作为答复，我们提供了一个统一的基础来比较一组八种不同的标量和矢量 IM 的损失估计，这些 IM 的危害可以通过现有 GMPE 进行预测。尽管所有八个都是合法的 IM，并且尽管一致使用条件频谱记录选择，但我们发现估计的损失风险存在很大差异。这表明在将危险与损失联系起来时仍然存在很大的不确定性。在这里考虑的 IM 中，矢量 IM 和至少光谱加速度的标量平均值在对三维 (3-D) 建筑物的预测中表现出显着的稳定性，这表明了可靠应用的潜力。
Present building-specific loss assessment state-of-art involves the convolution of seismic hazard and building seismic demands. The latter is conditioned on spectral acceleration, Sa(T1), at the building's first mode as the ground motion intensity measure (IM) and is typically estimated by carrying out nonlinear dynamic analyses on a two-dimensional (2-D) model. By new proposals on the use of improved IMs that can introduce higher fidelity, the accuracy in loss estimation becomes an open question. In reply, we offer a uniform basis for comparing the loss estimates for a set of eight different scalar and vector IMs whose hazard can be predicted with existing GMPEs. Despite all eight being legitimate IMs, and despite the consistent use of conditional spectrum record selection, we find large differences in the estimated loss hazard. This points to the large uncertainty still lingering when connecting hazard to loss. Among the IMs considered here, the vector IMs and at least a scalar average of spectral accelerations showed a remarkable stability in their predictions for the three-dimensional (3-D) buildings, pointing to a potential for reliable applications.