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Consideration of modelling uncertainties in the seismic assessment of masonry buildings by equivalent-frame approach

机译：等效框架法在砌体房屋抗震评估中模型不确定性的考虑

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摘要

The choice of modelling strategy and analysis options has a significant influence on the results of the seismic assessment of existing buildings and therefore it is very important to have an idea of the dispersion in the results due to different hypotheses regarding the structural model. This paper concentrates on pushover analysis, considered as the reference method currently adopted by engineers for the seismic assessment of existing masonry buildings, and on the equivalent-frame macro-element approach, assumed to be a satisfactory compromise between computational effort and accuracy in the results. A logic tree approach is used to treat the different considered options, including the definition of the geometry of the equivalent frame, the distribution of loads among the masonry piers and on the horizontal diaphragms, the degree of coupling between orthogonal walls, the definition of the cracked stiffness of structural elements and the modelling of masonry spandrels. By assigning a value of probability to each end branch of the tree, the distribution of the peak ground acceleration corresponding to the selected limit states can be obtained and, from this distribution, a quantitative estimate (in probabilistic terms) of the effect of modelling uncertainties on the seismic response of masonry structures is derived.
机译：建模策略和分析选项的选择对现有建筑物的地震评估结果具有重大影响，因此，由于有关结构模型的假设不同，因此对结果的离散性具有重要意义。本文着重于推倒分析（被工程师目前用作对现有砖石建筑进行地震评估的参考方法）以及等效框架宏单元法（假定在计算工作量和结果准确性之间取得令人满意的折衷） 。逻辑树方法用于处理各种考虑的选项，包括定义等效框架的几何形状，砌体墩之间以及水平隔板上的载荷分布，正交墙之间的耦合程度，结构元件的开裂刚度和砖砌墙托的建模。通过给树的每个末端分支分配一个概率值，可以获得与所选极限状态相对应的峰值地面加速度的分布，并从该分布中获得对建模不确定性影响的定量估计（以概率表示）推导了砌体结构的地震反应。

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